Sunday, July 31, 2011

Audio 300W Power Amplifier OCL Circuit

300W Power Amplifier OCL Circuit
This is a 300W power amplifier OCL circuit that the circuit has been stout kit on the market. If you're fanatical concerning the use of transistors 2N3055 and MJ2955 jengkol then this circuit is that the answer. This power amplifier OCL circuit delivering a blasting 300 watts to a four Ohm speaker.

The amplifier circuit is very least expensive and cans be powered from twenty four to 32 V/5A twin power supply. you must do that circuit. Its operating great. because four transistors (2 x 2n3055 and mj 2955) on the final amplifier can of some very hot then add the aluminum finned cooler and also the fan so the transistor is not too high temperatures.
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Thursday, July 28, 2011

Audio Remote Control Circuit Using IC 555

Remote Control Circuit Using IC 555
Ic 555 is an integrated circuit (chip) implementing a range of timer and multivibrator applications. The IC was designed by Hans R. Camenzind in 1970 and delivered to market in 1971 by Signetics (later acquired by Philips). the original name was the SE555 (metal can)/NE555 (plastic DIP) and the part was described as "The IC Time Machine". it's been claimed that the 555 gets its name from the three 5-kohm resistors utilized in typical early implementations, however Hanz Camenzind has stated that the quantity was arbitrary The part continues to be in wide use, because of its easy use, low price and sensible stability. As of 2003 it is estimated that one billion units are manufactured every year.

Depending on the manufacturer, the quality 555 package includes over twenty transistors, 2 diodes and fifteen resistors on a silicon chip put in in an 8-pin mini dual-in-line package (DIP-8).

The 556 could be a 14-pin DIP that combines two 555s on one chip. The 558 could be a 16-pin DIP that combines four slightly changed 555s on one chip (DIS & THR are connected internally, TR is falling edge sensitive instead of level sensitive).

Also accessible are ultra-low power versions of the 555 like the 7555 and TLC555. The 7555 requires slightly different wiring using fewer external elements and fewer power.


The connection of ic 555 as follows:
  • GND(1)Ground, low level (0V)
  • TRIG(2)A short pulse high-to-low on the trigger starts the timer
  • OUT(3)During a timing interval, the output stays at +VCC
  • RESET(4)A timing interval can be interrupted by applying a reset pulse to low (0V)
  • CTRL (5)Control voltage allows access to the internal voltage divider (2/3 VCC)
  • THR (6)The threshold at which the interval ends (it ends if U.thr → 2/3 VCC)
  • DIS (7)Connected to a capacitor whose discharge time will influence the timing interval
  • V+, VCC(8) The positive supply voltage which must be between 3 and 15 V
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Audio Simple Digital voltmeters using 7 segment

Simple Digital voltmeters using 7 segmentSimple Digital voltmeters using 7 segment Circuit

Digital voltmeters are instruments that measure voltage or voltage drop in a very circuit. They use solid-state elements and display values digitally. Typically, digital voltmeters (digital volt meters) are used to find excessive resistance that may indicate an open circuit or ground. they are conjointly used to identify low voltage or voltage drops that may indicate a poor connection. Digital voltmeters are connected in parallel (and never in series) with the circuit being tested in order that the meter will tap a small amount of current.

The positive lead is connected to the circuits positive aspect and also the negative lead is connected to the circuits ground. The digital voltmeters internal resistance is the impedance, which is sometimes expressed in ohms per volt. This amount is relatively high so as to forestall the device from drawing significant current and disturbing the operation of the circuit being tested. The sensitivity of the present meter and also the price of the series resistance determine the vary of voltages that digital voltmeters will measure.

Digital voltmeters will measure a spread of alternating current (AC) voltages, direct current (DC) voltages, or each AC and DC voltages. Devices typically display between 3 and 7 digits. Some digital voltmeters will capture minimum and maximum voltages known as spike readings.

In the image may be a series of easy digital voltmeter using the Seven-segment display, this series based mostly ICL7107.The ICL7107 may be a 3 one / a pair of digit LED A / D convertor. It contains an enclosed voltage reference, high isolation Switches analog, sequential control logic, and also the display drivers. The auto-zero change ensures zero reading for 0 volts input.
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Wednesday, July 27, 2011

Audio 1000Watt Audio Power Amplifier Blazer Circuit

1000Watt Audio Power Amplifier Blazer Circuit1000Watt Audio Power Amplifier Blazer Circuit

This is a audio power amplifier Blazer circuit provides up to 1000Watt . This fascinating routes several sensible bass and treble alive. Importantly ought to opt for Power offer supply, that has been fairly high voltage category 70Vdc GND -70V 10A is that the current low level.

The transistors are 2SC3858 (NPN) and 2SA1494 (PNP), and have high bandwidth, wonderful safe operating space, high linearity and high gain. Driver transistors are 2SC5200 (NPN) and 2SA1943 (PNP). All devices are rated at 230V, with the facility transistors having a 150W dissipation and also the drivers are 50W.

This circuit describes an amplifier, power offer and tests procedures that are all inherently dangerous. Nothing described during this article ought to even be thought-about unless you're totally experienced, grasp specifically what you're doing, and are willing to require full 100% responsibility for what you are doing. There are aspects of the look which will need analysis, fault-finding and/or modification.
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Monday, July 25, 2011

Audio Audio Selector Stereo 4 Channel

Audio Selector Stereo 4 ChannelAudio Selector Stereo 4 Channel

This circuit is for connecting the stereo outputs of four different channels as inputs and only one is selected for output at any time.

When the circuit breaker on, the channel A (AR and AL) is selected. If there is no audio on the channel A, the circuit waits for some time and then select the next channel (channel B). The search operation continues until it detects an audio signal in one channel. The time delay between channels or wait can be adjusted with the help of preset VR1. If time is no longer necessary, you can replace a capacitor C1 with a higher value.

Manually jump from one channel to another channel active active, just press the jump switch (S1) to the desired channel input is selected. The selected channel (A, B, C or D) is indicated by the corresponding bright LED (LED 11, 12, 13 or 14).

IC contains 4 analog switches CD4066, these switches are connected to four channels. These analog switches controlled by IC CD4017 outputs. CD4017 is a 10-bit ring counter IC. Since only one of its products is high at any instant, only one switch is closed at a time. CD4017 IC is configured as a ring counter 4-bit by connecting the fifth exit Q4 (pin 10) on the reset pin. Capacitor C5, in connection with the resistor R6 form a power circuit-on-reset IC2, so that the initial change of the power supply, output Q0 (pin 3) is always high. The clock signal is provided by IC1 CD4017 NE555 which acts as an astable multivibrator when transistor T1 is in state court.

KA2281 IC5 is used here not only to indicate the levels of stereo audio channels selected, but also to bias transistor T1. As soon as a specific audio threshold is detected in a selected channel, the pin 7 and / or pin 10 of IC5 goes low. This low level is coupled to the base of transistor T1 through a combination of diodes D2-R1/D3-R22 resistance. As a result, transistor T1 conducts and causes the output of IC1 to remain low as long as the output of the selected channel audio level exceeds the threshold.

VR3 VR2 and Presets are included for adjusting each of the threshold levels for audio left and right stereo channels as desired. Once the action multivibrator IC1 is disabled, the output of IC2 is not changed more. Therefore, searching through the channels continues until it receives an audio signal above the threshold. Jumping the switch S1 is used to jump from one audio channel, even if present in the selected channel. The number of channels can easily be extended to ten by 4066 the use of additional integrated circuits.
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Audio LM723 based on Variable Voltage Regulator

LM723 based on Variable Voltage RegulatorLM723 based on Variable Voltage Regulator

This is the voltage regulator circuit varying from 3 to 30V 3A max, to use IC LM723 for control of stable volts regulated. The 2N3055 power transistor to drive the current to 3 amps. The control VR1 used 3V to 30V output. It is suitable for general electronics workshop. Because it is a simple circuit and easy circuit
Note:
  • T1 can be a 220V primary, 32VCT secondary, 3A step down transformer.
  • MJ3001 power transistor must be fitted on a proper heat sink.
  • Output voltage can be adjusted by using the POT RV1.
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Sunday, July 24, 2011

Audio 14W Class A Amplifier Circuit with 2N3055

14W Class A Amplifier Circuit with 2N305514W Class A Amplifier Circuit with 2N3055

This class A amplifier circuit requires a preamp as it hasn't got much gain. Requires large heat sinks and a large transformer and a source of great power and wiring carefully, but the end is very simple and sounds great. The zener diode disclaims any wave from the power supply, but still just want a wave of 10mV max. The ripples reaching the entrance is amplified, so the zener get rid of that, but there is still dominated him to reach the power stage.

Many early amplifiers operated in Class A, but as 10W power output rose above the problems of heat dissipation and design of the power supply caused most manufacturers to turn to the simplest, arrangements more efficient class B and put up with the consequent decrease in the perceived quality of output. Why Class? Because, when biased in class A, the transistors are always on, always ready to respond instantly to an input signal. Class B and Class AB output stage requires a microsecond or more on. The kind of a cleaner operation allows operation under high voltage swing that occurs when the transient audio signal feed difficult loads. Your amplifier is basically simple, as shown in the block diagram.
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Friday, July 22, 2011

Audio CD4001 based on Car Alarm Circuit

CD4001 based on Car Alarm CircuitCD4001 based on Car Alarm Circuit

This is a simple alarm circuit for a checkup with a 4001. It can be used to protect our home, motorcycle, car or any other application that comes to mind. In this circuit will be a computer simulation with Livewire and then design the printed circuit Kicad.

OPERATION
SW1 is a normally closed switch when pressed triggers the flip-flop formed by the two NOR gates of the CD4001 and remains there for a time determined by the time constant of R5-C2. This time it is keeping the relay RL1 and operated by its two contacts that investors control of two loads, for example, a siren and a light or any other that we connect to P3 and P4.
After that time, the relay circuit is switched off suddenly the alarm is activated again.

We can replace the switch SW1 PIR motion sensor, an infrared barrier, a smoke detector, gas detector, a magnetic sensor, a panic button or other device to act as a closed switch and opened fire alarm.

PRINTED CIRCUIT DESIGN

For the circuit can only practical substitute for a preset R5 (RV1) to adjust the monitor while it loads
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Thursday, July 21, 2011

Audio IC TA8215 based on 15W Car Audio Amplifier

IC TA8215 based on 15W Car Audio AmplifierIC TA8215 based on 15W Car Audio Amplifier

This is the circuit of the amplifier channel stereo BTL 15W audio power IC based on TA 8215 developed by Toshiba. In this circuit, power amplifier, TA 8215 two ICs are used. This is for the acquisition of four channels has two channels of each IC. TA 8215 is an integrated circuit with the stages of power amplifier and preamplifier integrated inside.

The power required for this amplifier is only 12 V DC. The maximum output power of each channel of delivery of this amplifier is 15 W at 4 ohm speaker and a so called 4 x 15 W power amplifier.

IC TA8215 based on 15W Car Audio Amplifier
R1 R2 form a voltage divider that attenuates the input signal of 24 dB. Given the 50dB gain of the chip, leaving the total gain of 26dB, a little more than enough to fully saturate the amplifier when the sound card works at maximum output. DC C1 preamp input blocks. C2 is the ground return of the feedback circuit. These two capacitors have to be in the relationship is shown, in order to remove the switch clicks when turning the circuit on and off. The output pins 15 and 16 are connected directly to the speaker, while C7, R6, R7 and C8 provide adequate loading phase change to avoid high frequency instability.

The power supply is decoupled with a capacitor of 100uF rather small. That's enough to decouple the higher frequencies and lower frequencies anyway large capacitors in power supply from PC are fine. The pins 10 and 17 supply power amplifiers, while the pin 9 provides power to the previous stages. This power is filtered by C3. The control pin 4 to shut down power amplifier, an option is not used here, so it is tied to 12V. Pin 1 is an entry of silence also is not used and left open.
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Wednesday, July 20, 2011

Audio Anti-Log Converter Schematic Circuits

Anti-Log Converter Schematic Circuits Anti-Log Converter Schematic Circuits

Anti-log or exponential bearing is artlessly a amount of rearranging the logarithmic circuitry. The ambit diagram beneath shows the chip of the log adapted to accomplish an exponential achievement from a beeline input.

The emitter of Q2 in admeasurement to the ascribe voltage is apprenticed by amplifier A1 in affiliation with transistor Q1. The beneficiary accepted of Q2 varies exponentially with the emitter-base voltage.

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Audio 5 Band equalizer using IC BA3812L

5 Band equalizer using IC BA3812L
In this part of the inquiry in a series of 5-band Equalizer circuits with a single IC BA3812 L. a device used in the hi-fi. IC BA 3812 This is with 5-point Equalizer with all the functions integrated in IC.

Equalizer has advantages, namely: small distortion, a small noise, dinamic local area, & is suitable for a series of hi-fi stereo. & with a wide voltage range from three.5 volt to 16 volt. Voltage is the recommended 8 volt but according 9volt highest voltage.

The following 5 frequency channels from this series:

100 hz
300 hz
1 khz
3 khz
10 khz

5 band simple Equalizer

5 Band equalizer using IC BA3812LFollowing series can be used as a five channel Equalizer simple cheap. Working principle of this series is a series of band pass frequency with middle frequency of ten kHz, two.5 kHz, 625 Hz, 40 Hz and 155Hz. By using potensiometer, the worth of each frequency band pass feasible change.
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Audio Decoder circuit Seven Segment 5 Bit

Decoder circuit Seven Segment 5 BitFor example, if the input PA, PB, PC, PD, PE = 11 01 0, then after the translated by the decoder will produce numbers a, b, c, d, e, f, g (MSD) = ten 0 one One one One as well as a, b, c, d, e, f, g (LSB) = 0 0 one 0 0 one 0. These numbers indicate that the negative pole (cathode) of the LED in a specific segment of a low voltage bias (0) so that the lights forming the number "12" on the seven-segment display devices. For more details can be seen in the picture.

This decoder circuit also serves to modify the 5-bit binary numbers to decimal to be displayed by seven segments. This decoder has a five pin input PA, PB, PC, PD PE & 14 pin output marked a, b, c, d, e, f & g.

Decoder circuit Seven Segment 5 Bit
In the circuit above using Seven Segment (7 Segment ) commond anode type. The principle works is, if the input pin Seven Segment a, b, c, d, e, f, g given voltage 0 volts, the LED on the Seven Segment props will be forward biased & turned to form a specific figure.

The seven segments may even be supplied with higher voltage (up to 18 V) but you need to replace the R 22 ohm with a greater value; morever, an appropriate mast Rext be Chosen.

Decoder circuit Seven Segment 5 Bit
Absolute maximum rating IC TDA4092
  • Supply voltage…………….... 10 V
  • Input voltage……………….. .10 V
  • Off state output voltage…...... 20 V
  • Output current………………. 22 V
  • Total power dissipation ….. ... 0.8 mW
  • Storage and junction storage… -25 to 150 C
  • Operating temperature………. 0 to 70 C

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Tuesday, July 19, 2011

Audio Insect Repeller Circuit Diagram

Insect Repeller Circuit DiagramIn this section we talk about a type of insect repellent insect repellent is a circuit that repel insects from your home or garden effectively. This circuit uses the frequency of bullying of insects to the insect goes.

For this insect repellent skesta be installed inside or outside the home can / the speakers. This series of in-circuit PLL oscillator circuit adl / phase looked loop by using a CMOS 4047 at a rate 22 khz.gunakan external power supply for best results.

IC 4047 Description

The CD4047B is capable of operating in either a monostable or astable. It requires an external capacitor (between pins 1 and 3) and an external resistor (between pins 2 and 3) to determine the output pulse width in the monostable mode and the output frequency in astable mode
Insect Repeller Circuit DiagramAbsolute Maximum Ratings IC IC 4047

DC Supply Voltage (VDD)...........-0.5V to +18VDC
Input Voltage (VIN)...............-0.5V to VDD +0.5VDC
Storage Temperature Range (TS)....-65°C to +150°C
Power Dissipation (PD)
Dual-In-Line...................... 700 mW
Small Outline..................... 500 mW
Lead Temperature (TL)
(Soldering, 10 seconds)........... 260°C.
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Sunday, July 17, 2011

Audio TL072 Op-Amp based 11-90 hz Subwoofer Filter

TL072 Op-Amp based 11-90 hz Subwoofer FilterTL072 Op-Amp based 11-90 hz Subwoofer Filter

TL072 Op-Amp based 11-90 hz Subwoofer FilterTL072 Op-Amp

The circuit subwoofer filter allows the addition of subwoofers to an existing full-range system, offering adjustable low-pass filter with the option of momentum and R6 and R8 mono-summary.

The subwoofer filter to remove separate preamplifier circuit to drive the low frequency sound a lot. At the tone, dial tone and can not be normal to do ... is a fine deep low bass sounds like a drum, or a cinema complex in a low voice if you can listen but to add cabinets and amplifiers. Subwoofer circuit is low-pass frequency of 11-90 Hz switching power supply 12V court if necessary to use +-15V. I changed the capacitor to cut the voice by a red circle mark.
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Audio 5 Volt Regulator using Dioda Zener

5 Volt Regulator using Dioda Zener
The regulator circuit is basically using the zener regulator is configured with an NPN transistor to produce a large amount of cash. the controller operates in the zener breakdown voltage to produce the same results with the zener voltage. VBE is the voltage emitor base size transistor Q1 from 0.2 to 0.7 volts depending on the type of transistor used.

Components List:
* R1 = 560 ohms
* C1 = 1000uF/40V
* C2 = 10uF/25V
* C3 = 330nF
* Z1 = 5.7 V
* Q1 = ECG184, NTE184

This regulator series of functions to change the voltage from 12 to 5 volts. The core of this series is the zener diode. due to a voltage drop across Zener diode 12 is 5.7 volts. voltage electrical currents to 5.7 volts, reinforced by Q1 taransiator

For an output voltage that can change the zener diode as needed. For example, if you need a converter to change from 12 to 9 volt Zener diode eat 5.7 to 10 volts.
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Audio 2N3055 based on 12 Volt Adaptor

2N3055 based on 12 Volt Adaptor
This adapter circuit can deliver up to 3A output voltage of 12V. The circuit can be used in cases when a current of more than 3A is required for the controller. IC regulators such high current rating are quite hard to find.

The T1 transformer steps down the voltage of the rectifier bridge 12rms and D1 to produce a rectified voltage. The C1 filters the output of the rectifier produces a DC level. The passage of the series transistor Q1 (2N 3055) is biased by resistor R1 (680Ω). Since D1 is Zener breakdown region of the voltage across it is 12V. So the total output voltage of 12.7 V is constant (in theory). Zener voltage which is the most base emitter voltage of transistor Q1 Q1.Here take out the excess power needed.

Notes.
  • If 12V zener is not available ,use the nearest value.
  • The transformer T1 can be as 23oV primary;15V/5A secondary step down transformer.
  • The capacitors must be rated at least 25V.
  • By changing the value of the Zener diode, different output voltages can be obtained from the circuit.

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Friday, July 15, 2011

Audio TDA1011 - 4W Audio Amplifier Circuit

TDA1011 - 4W Audio Amplifier CircuitTDA1011 - 4W Audio Amplifier Circuit

This is 4 watts amplifier circuit diagram for implementing portable radio with TDA1011 from Philips Semiconductor.

The TDA1011 is a monolithic integrated audio amplifier in one place-9 in line (SIL) plastic container. The device is specially designed for portable radio and recording applications and offers up to 4 W at a load impedance of 4 W. The device can deliver up to 6 W 4 W to 16 V power load on the network powered applications. The maximum permissible voltage of 24 V makes this circuit very suitable for DC and AC unit, while the application supply voltage of 3.6 V low V enables applications 6.
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Audio TDA1010 - 10W Audio Amplifier Circuit

TDA1010 - 10W Audio Amplifier Circuit
The audio amplifier circuit is a class B amplifier audio power with a TDA1010. It is easy to build and has only a few external components. The circuit is designed with a short circuit and thermal protection. You can drive loads as low as 1.6 ohms and is capable of 10 watts deliveringover from an external 16 V DC.

The TDA1010 is a monolithic integrated circuit class B audio amplifier in one place-9 in line (SIL) plastic container. The range of voltage across and the flexibility of the IC to be an attractive proposition for turntables and tape recorders with outputs of up to 10 W.
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Audio 6 Band Graphic Equaliser Using 741 Op-Amp

6 Band Graphic Equaliser Using 741 Op-Amp6 Band Graphic Equaliser Using 741 Op-Amp

This circuit is 6-band graphic equalizer, you can adjust the sound of low, medium and higher than the IC op amp circuit used 741. With this circuit you can control and mix of frequencies and tones to your liking.

In essence, the circuit comprises an IC 741, whose gain is determined by several freguencies adjustment potentiometer.

Audiblefrequency spectrum is covered in six steps: 50Hz, 160Hz, 500Hz, 1.6kHz, 5kHz 16kHz,. All potentiometers are linear 100kΩ. The circuit provides adequate boost / cut for normal use.

power supply for the circuit can be derived from the amp / preamp itself. The supply voltage range of rangeof (6V-20V) makes the circuit very versatile. Power consumption is negligible.

list Component
R1,R2,R3,R4,R5,R6 : 27kΩ     C1: 100n      C6: 300pF
R7: 470kΩ C2: 33n C7: 100uF/16V
R8: 330kΩ C3: 10n C8: 4.7uF/16V
R9: 100kΩ C4: 3.3n C9: 47uF/16V
R10: 4.7kΩ C5: 1n IC1: 741 Op amp
R11: 4.7kΩ
VR1,VR2,VR3,VR4,VR5,VR6: 100kΩ Linear Potentiometers


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Wednesday, July 13, 2011

Audio USB Audio Interface based DAC PCM2902

USB Audio Interface based DAC PCM2902
This is the circuit quality preamplifier with built-in USB DAC for my Leachamp power amplifier. Scheme is PCM2902 datasheet. Circuit includes DAC and ADC, SPDIF input and output of HID and with 3 buttons + MUTE, VOL-and VOL.

For playback of high quality needed for external low-drop voltage stabilizer for the DAC. LP2951CM DAC is used, which was readily available in local stores. Output voltage is fixed at about 3.7 V with two resistors. Circuit board is designed with regard to the placement of good land, and the separation of digital and analog ground. These earth are connected in a single point in a USB connector.

USB Audio Interface based DAC PCM2902
The PCM2902 data sheet is recommended to connect a low pass filter the DAC output to filter high frequencies above audioband produced by the conversion of oversampling. Digital integrated circuits that includes LPF filter frequency above 100 kHz. In the Notes application filter on the pages of the manufacturer recommends first-order LPF (simple RC) or 2 nd order with amplifiers operating as a preamp that works well. I simple RC LPF with the recommended values ​​R and C 1k 4N7. It is best to use the scroll-type ceramic capacitor in place. I did not hear the difference in sound between the connection filter or not, but with respect to other components in an audio chain is best used. For maximum cutoff frequency that can change the capacitor value of 3n3
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Audio Passive Crossover schematic


Crossover is a tool to limit the "frequency range" to be accepted by the speaker. Imagine that the court act as traffic police, which regulates the flow to the tweeter, midrange and bass for the subwoofer.

Imagine if you had not crossed, the frequency will be chaos, there is a loss of low frequency on high street frekwesni tweeter on the subwoofer, so it is not effective and also if there are strangers in the low-pitched sounds, and can also be broken tweeter for bass. so they should let all directional crossover.

Notes:
  • Capacitor must be non-polar capacitor types with a voltage rating of 50 volt or more (preferably 100 volt).
  • Capacitor may be paralled to achieve specified values.
  • Resistors should be 100 Watts or more.


This is the formula to calculate the inductance value of an inductor. Of course, this formula can be inverted to calculate the number of inductor winding inductance if its value is determined.

  • L: inductance in H (Henry)
  • m: permeability core (core), m = 1 (Special inductor without core / winding water)
  • mo: vacuum air permeability, mo = 4p x 10-7
  • N: number of inductor winding
  • A: inductors sectional area (m2)
  • l: length of the inductor (m)
read more "Audio Passive Crossover schematic"

Audio 12 volt Adaptor using 2n3055

12 volt Adaptor using 2n3055
This adapter circuit can deliver up to 3A output voltage of 12V. The circuit can be used in cases when a current of more than 3A is required for the controller. IC regulators such high current rating are quite hard to find.

The T1 transformer steps down the voltage of the rectifier bridge 12rms and D1 to produce a rectified voltage. The C1 filters the output of the rectifier produces a DC level. The passage of the series transistor Q1 (2N 3055) is biased by resistor R1 (680Ω). Since D1 is Zener breakdown region of the voltage across it is 12V. So the total output voltage of 12.7 V is constant (in theory). Zener voltage which is the most base emitter voltage of transistor Q1 Q1.Here take out the excess power needed.

12 volt Adaptor using 2n3055
Notes.
  • If 12V zener is not available ,use the nearest value.
  • The transformer T1 can be as 23oV primary;15V/5A secondary step down transformer.
  • The capacitors must be rated at least 25V.
  • By changing the value of the Zener diode, different output voltages can be obtained from the circuit.

The 2N3055 is a silicon Epitaxial-Base Planar NPN transistor mounted in Jedec TO-3 metal
case. It is intended for power switching circuits, series and shunt regulators, output stages and high fidelity amplifiers.

Maximum Ratings
  • Collector-Base Voltage 100 V
  • Collector-Emitter Voltage (RBE £ 100W) 70 V
  • Collector-Emitter Voltage (IB = 0) 60 V
  • Emitter-Base Voltage (IC = 0) 7 V
  • Collector Current 15 A
  • Base Current 7 A
  • Total Dissipation at Tc £ 25 oC 115 W
  • Storage Temperature -65 to 200 oC
  • Operating Junction Temperature 200 oC
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Sunday, July 10, 2011

Audio DC Motor Speed Control using PWM

DC Motor Speed Control using PWM
The so-called PWM or Witdh modulation is a technique often used to control a load, for example, is the control of DC motor speed PWM techniques are used frequently.

Usually to make a simple PWM (for practice or the introduction PWM) fans to use some of the facts of the op-amp circuit, which consists of Schmitt Trigger circuit, the integrator and comparator.

DC Motor Speed Control using PWM
Schmitt Trigger function that produces a square wave will become the sawtooth wave or integrator is also called common rail and the ramp compared to a reference voltage that can change a lot of stress. So the result is a PWM output.

DC Motor Speed Control using PWM
These two schemes are variations of different circuit PWM. The diagrams are for 12V operation and there are upper (ground) and low side (+12 V common) versions. The version of the lower circuit uses an N-channel FET, the high-side version of the circuit uses a P-channel FET. N channel devices tend to handle more current P-channel devices, which are also less expensive. The version of the high side of the circuit is useful when a portion of the load must be grounded.

This circuit can change a fairly high amount of current, a MOSFET IRFZ34N can handle over 35 Amps if connected to an adequate heat sink. Higher power FETs, such as IRF1010Z IRFZ48N or can be substituted if even larger currents are required. It is also possible to connect multiple FETs in parallel even more current capacity. Always use thermally conductive grease between the FET and the heat sink, and remember that the heatsink is under stress.

Inductive loads (motors) may require special care because it can generate large voltage spikes that can damage the MOSFET. Replacing a 1N4002 fast recovery diode can help absorb the recoil reverse voltage when driving an inductive load like a motor. If you use these circuits to experiment with electric vehicles, be sure to install a circuit breaker in series with the battery, the switch should be easy to reach by the driver. This is especially important given the fact that when non-MOSFETs, is often cut, leaving the engine running at full speed
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Audio Driver Led Dot Matrix 8 X 8 circuit

Driver Led Dot Matrix 8 X 8 circuitDriver Led Dot Matrix 8 X 8 circuit

in a continuing series can find a way to drive a LED array with 64 LEDs (8 rows by 8 columns - 8x8 screen) or less, for example, 35 LEDs (7 rows and 5 columns - 5x7 points). Driving a 64 LED matrix display is simple and requires only the parent unit led by example, more than 128 or multiplier can develop by itself.

Use persistence of vision to drive the LED matrix of 64 microcontroller with only 10 starts! Normally it takes 64 outputs of 64 LEDs, but by using multiplexing and a chip support you can get away with 10.

Multiplexing LED display simply means an LED light for a short period of time and do this several times for each LED. If you do this fast enough, then your eye will not notice any flicker.

Note:
The unit used in this project is simply an array of 64 LEDs.
LEDs are no different than any other LED, but it saves a lot of welding and all wiring has been done for you. Or you can wire yourself if you can not be done with the module.
If the same thread that still has only 10 control cables (LEDs wired just the same as shown in the diagram of the module)
read more "Audio Driver Led Dot Matrix 8 X 8 circuit"

Audio Simple Speaker Protector circuit


This Simple Speaker Protector circuit is then connected the speakers to the amplifier output power of only a few seconds after the amplifier is on, so the speakers do not accept a high voltage appeared and did not hear a rumbling sound from the speakers when the amplifier is on. This material is harmful to the speakers.


When the amplifier is on the bridge D1 is also fed through the amplifier power switch. Capacitor C1 filters the output of the bridge rectifier D1. When the power switch is performed on the transistor Q1 turns on only after the capacitor C2 is sufficiently charged (0.7 V) through resistor R1. Here the value of C2 and R1 are selected so that the delay is about 2 seconds.

As the relay is activated only after a few seconds, the amplifier is on and until then the speaker will remain isolated from the audio output of the amplifier and the speaker is connected to the amplifier output through contact N / O relay. During this initial delay of the amplifier output resistance is based on R2 through contact N / C relay. This is done to ensure that the DC blocking capacitor in the amplifier output is loaded before you connect the speaker
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Friday, July 8, 2011

Audio Electret Microphone Preamplifier 1 Transistor

Electret Microphone Preamplifier 1 Transistor

This is a simple Electret Microphone Preamplifier 1 Transistor circuit which can be used between the microphone and stereo amplifier. The microphone amplifier circuit suitable for use with the normal line of amplifier stereo / CD / AUX / Tape inputs. This preamp can take both dynamic and electret microphone inputs. The circuit performance is not superior, but can be used with many projects, not so serious.

The circuit is a simple transistor amplifier with an amplification of about 30-40 dB. The dynamic microphone is just a simple transistor amplifier circuit with nothing special in it. D1 LED on the circuit to show that the circuit works. The voltage drop caused by LED (about 1.8 V for the red LED) is Taten into account when designing the amplifier circuit built around Q1. Resistor R4 and capacitor C5 to a filter to filter out the noise as possible to the battery or power source that is used to power this circuit. Capacitors C1, C2 and C3 are used to block the polarization at the base of Q1 to leave the microphone to microphone
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Thursday, July 7, 2011

Audio Triangle Square Wave Generator Using Op-Amp

Triangle Square Wave Generator Using Op-AmpTriangle Square Wave Generator Using Op-Amp
The circuit shows a simple triangle and square wave generator with a common dual operational amplifier LM1558 to produce very low frequencies around 10 kHz. The time interval for one half cycle is about R * C and outs of supply of 10 mA. The amplitude of the triangle can be altered by adjusting the 47K and waveform offset can be eliminated by adding a capacitor in series with the output.

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Audio 2 Volt Battery Monitor by IC LM3914

2 Volt Battery Monitor by IC LM3914
This 2 Volt Battery Monitor by IC LM3914 circuit makes it possible to monitor the charging process to a higher level. Adjustsments end are simple and all you need is a digital voltmeter for the necessary precision. Connect an input voltage of 12.65 volt between the positive and negative poles and adjust the 10K potentiometer until the LED 10 lights up. Reduce tension and the sequence of all other LED lights. Control has been an enlightening about 11.89 volts.

At 12.65 volt and higher the battery is fully charged, and 11.89 is considered "empty". This circuit, with the components shown, uses less than 10 mA. Of course you can adapt this circuit for their own needs, making small modifications. The previous circuit is set to "point" mode, which means only one LED at a time goes on. To use the mode of "bar", then connect pin 9 to the positive supply rail, but obviously with increased current consumption. The brightness of the LEDs can be adjusted up or down by choosing a different value for the 4K7 resistor connected to pin 6 / 7.
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Tuesday, July 5, 2011

Audio Regulator 5 volt using IC 7805

Regulator 5 volt using IC 7805Regulator 5 volt using IC 7805 Circuit

The IQ 7805 provides circuit designers with an easy way to regulate the DC voltage of 5V. Encapsulated in a single chip / package (IC), the 7805 is a positive DC voltage regulator which has only 3 terminals. They are: input voltage, ground, output voltage.

Although the 7805 were designed primarily for fixed output voltage (5V), it is possible to use external components for voltage DC output: 5V, 6V, 8V, 9V, 10V, 12V, 15V, 18V, 20V, 24 . Note that the input voltage, of course, be greater than the required output voltage, so you can down-regulate

Regulator 5 volt using IC 7805
Features IC regulator 7805
• Output Current up to 1A
• Output Voltages of 5 Volt
• Thermal Overload Protection
• Short Circuit Protection
• Output Transistor Safe Operating Area Protection

Data max IC 7805
Input Voltage........................................ 35
Thermal Resistance Junction-Cases (TO-220)40......... 5 °C/W
Thermal Resistance Junction-Air (TO-220)............. 65 °C/W
Operating Temperature Range (KA78XX/A/R)............. 0 ~ +125 °C
Storage Temperature Range............................ -65 ~ +150 °C.
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Audio Bass-Trable Audio Tone Control

Bass-Trable Audio Tone ControlBass-Trable Audio Tone Control

This is a simple tone control can be used 05 audio applications. Amplifers can be added to, which is used as a single control module, or integrated into new and exciting instruments. IC is a construction of a circuit makes it very compact, with only a few support components are needed. In addition, it uses dual power supply. This means that the circuit will run from 9V to 15V (although the low will be a little weaker 9V).

IC LM1036 controls the tone (bass / treble), volume and balance circuit for stereo applications in car radio systems, television and audio. An additional control input allows loudness compensation to be made simply. Four control inputs allow to control bass, treble, balance and volume functions through application of DC voltages from a remote control system, or from four potentiometers which may be biased a source of regulated zener always in the circuit. Each tone response is defined by a single capacitor chosen to give the desired characteristic.

Note: Vcc can be anything between 9V to 16V and the output capacitors are 10uF/25V electrolytic.

Tone Control Features:
* Wide supply voltage range, 9V to 16V
* Large volume control range, 75 dB typical
* Tone control, 15 dB typical
* Channel separation, 75 dB typical
* Low distortion, 0.06% typical for an input level of 0.3 Vrms
* High signal to noise, 80 dB typical for an input level of 0.3 Vrms
* Few external components required
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Audio Traffic Light 20 Chanel based on 74LSxx

Traffic Light 20 Chanel based on 74LSxxTraffic Light 20 Chanel based on 74LSxx

This view of the proposed traffic Light 20 Chane based only on family and 74LSxx IC 555 as clock source. It is a digital logic circuit. To construct the traffic light rangkaian Control requires no programming of microcontrollers.

This page features a circuit that has twenty open collector outputs that turn on one at a time in a continuous sequence. The circuit make use of the family 74LSxx TTL integrated logic devices. The circuits are designed to drive light emitting diodes or low current and low voltage incandescent lamps, but can also lead to other charges of 80 milliamps.

notes:
  • The low output go in sequence from 1 - 0 and back to 1 -0
  • At the clock rate of the 555 timer
  • c3 = 1uf to 10uf depending on the rate of change desured
  • R2 (Variable resistor) in use to determine the timer
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Sunday, July 3, 2011

Audio Ultrasonic Remote Control Circuit

Ultrasonic Remote Control Circuit
This is a remote control circuit using ultrasonic signals. The Ultrasonic Remote Control Circuit is built around IC1 (NE 555). IC1 astable operating system is a multi-vibrator in the output of the amplifier IC1 is 40KHz.The complementary pair of transistors (Q1 and Q2) and transmitted by the ultrasonic transmitter K1. Switch S1 is used to activate the transmitter.

Note:
  • switch S1 can be a push button switch.
  • The preset R16 can be used to adjust the sensitivity of the receiver.
  • The frequency of the ultrasonic signal can be varied by adjusting the preset R17.Adjust it for optimum performance.
The receiver uses an ultrasonic transducer sensor (K2) to detect the ultrasonic signals. When an ultrasonic signal is falling on the sensor, which produces a voltage signal proportional to its output. This weak signal is amplified by the two-stage amplifier circuit comprising transistors Q3 and output amplifier Q4.The is rectified by the diodes D3 and D4.The rectified signal is given to the inverting input of operational amplifier is connected as a comparator. When ever there is an ultrasonic signal that falls on the receiver, the output of the comparator activates the transistors Q5 and Q6 to drive the relay. Thus the load connected through the relay can be changed. The diode D5 is used as a freewheeling diode.
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Audio Rain Detector using SCR 106CY

Rain Detector using SCR 106CYRain Detector using SCR 106CY

This circuit uses a sensor made of a small piece of circuit board and recorded a simple SCR circuit to detect rain and sound of a bell. The SCR could also be used to activate a relay, light a lamp, or send a signal to a security system.

1. The sensor is a small piece of PC board etched to the pattern showen in the schematic. The traces should be very close to each other, but never touching. A large spiral pattern would also work.
2. Make sure to use a loud buzzer.
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Audio RS232 Reset for Microprocessor

RS232 Reset for MicroprocessorRS232 Reset for Microprocessor

This circuit allows a remote microprocessor to reset the control of a host by sending an interrupt signal on an RS-232 or RS-422 serial line. If the remote machine is restarted on a simple program loader program, it is possible that the host to stop and restart, or stop and reload / restart the program the remote machine. This is an ideal way to develop software in EPROM higher based systems. Modern EEPROM / NVRAM systems use JTAG interfaces to achieve similar results.

The remote processor will run your code outside RAM target, which allows code to be updated easily. The circuit is generally used to develop code on a target processor, but can also be used for permanent applications in the target program on the hard lives of a host system. This system was used once to load the code into a microprocessor-based satellite receiving system in Hawaii to a host in Colorado with an Internet-based distance learning program for serial communications.

A program loader for the Z80 CPU is available below. The circuit has also been used Motorola 68HC11 EVB with the monitoring program and Buffalo. See my Linux Cross Assemblers page for more information.

Theory
This circuit detects signals from zero-length (breaks) in an NRZ (non return to zero) of the serial data line. Normal standard characters spend a short time in the zero state, and do not cause a reset. Break signals are an exception to this, hold the line low for an extended period.

The parties maintain 10K/1N4148 2.2uF capacitor charged. Low input signals go through the 10K resistor and slowly pull the load on the 2.2uF capacitor below. The high input signals rapid recharging of the capacitor through the diode 1N4148. A break signal lasts long enough to download the 2.2uF capacitor to the point where the next door changes state.

The 1N4148 on the right allows a manual cutoff switch for use in the target CPU, pressing a switch does not cut the previous 74HC14 gate.

This circuit can be constructed with only two buffers Schmidt trigger investment not, 74HC14 was chosen because it is a common part. Investors are also optional parallel, investors will only work well.

Z80 loader program
This is a Z80 assembly language program that works as a boot loader for use with microprocessor reset circuit RS-232. This code runs on an old SD SBC200 board systems and circuit Z80 can do to work with other boards Z80 changing the initialization and functions of the serial port.
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Friday, July 1, 2011

Audio Audio Video Distribution Amplifier circuit

Audio Video Distribution Amplifier circuit
Audio Video Distribution Amplifier circuitAudio Video Distribution Amplifier circuit

With the amount of equipment in home entertainment facilities today the need to be able to fluctuate the gain of the audio and also video signal is needed. I observed this specific circuit very helpful while used in conjunction with the General Descrambler and also a Stabilizer circuit I built for making duplicates of video tapes. This not just allowed myself the ability to fine tune the video durability it also helped me improve the recorded audio which typically will become bad when creating tape copies.

Circuit functioning is straight forward for amplifier circuits. The second channel for the audio amp consists of the same parts except another half of IC1 is required. Pin 6 & 5 are inputs and also 7 is the output.
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