Very Low Noise Balanced Microphone Preamplifier Circuit
Topics: Amplifier Circuits / Audio Amplifiers
This circuit is similar to to the professional grade microphone preamplifier that are used in commercial-grade audio mixing desks, according to the commentary. Features very low noise, balance input and high gain.
This amplifier circuit is designed to have noise levels close to that of the theoretical minimum. It features balanced microphone input, variable hi-gain and high hum rejection, meaning that it's pretty sweet!
The circuit uses a transistor compound pair of 2N4403's and BC549's, which provides for a more linear response. It then uses a TL071 op-amp circuit in order to facilitate the differential (balance) input.
This mic preamp operates at 15 Volts DC - and the power supply should be very regulated and smoothed for optimum results. The circuit does however feature and small DC smoothing filter (C4/R14), which will help smooth small ripples on the DC supply.
- Microphone Circuit
- Balanced Microphone Preamp
- Mic Preamp Circuit
- Microphone Preamp Circuit
- Preamp Circuit
Thank you