Op-Amp (LM741) Mic Preamplifier | Audio Circuits

Sunday, December 18, 2011

Op-Amp (LM741) Mic Preamplifier

Rangkaian op-Amp mic preamplifier

This Circuit of microphone preamplifier has a high quality and using a single power supply, suitable for dynamic or electret microphones. The op-amps Used Can be any low noise, high performance type, eg LM471, NE5534, TL071, OPA 371 etc.

rangkaian op-Amp  mic preamplifier Skema rangkaian op-Amp mic preamplifier

The design is a non-inverting amplifiers design, the input is applied to the non-inverting input of the op-amp pin 3 Which is in most cases. The input impedance is 23.5k, the overall voltage gain is determined by R2 and R1 and with the values of R2 and R1 on the circuit diagram the voltage gain (for mid band, 1KHz) is approximately 27.2dB.

Op-amp feature high gain bandwidth products, have a fast slewing rate and have extremely low noise. It is difficult to achieve the same performance using discrete components. Finally the overall signal to noise ratio has been calculated, the source was a 1k impedance microphone generating a 1mV pk-pk sine wave. An impressive result of 110dB S/n at 1KHz is achieved. In practice this figure will be lower and determined by the quality of the microphone used.

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