Categories: Pre-amplifier

Mono Preamp with Small Transformer and Two Transistors

The microphone preamplifier described here is a ‘hybrid’ passive / active. A small transformer input provides a small contribution to the gain of all (about 10 dB), and a transistor provides the additional gain (35 dB) for normal use with a small dynamic microphone. About 40 kHz bandwidth, small and simple installation that requires little space.

Power supply : It is not unusual, it chose the power of 24 V. The reason is that we want to have a module with a fixed gain and not adjusted. if your also want to use the microphone low output signal amplitude  your can lower the supply voltage to 15 V or 12 V. Make all the same tests with 24 V and 12 V, just to see whether you notice a difference in the sound …

Amplifier Circuit

Recent Posts

10-100W Class-D Power Audio Amplifier Using MD7120 MOSFET Driver

Class-D Power Audio Amplifier Using MD7120 MOSFET Driver This is the circuit design of Class-D…

3 years ago

Active Antenna Amplifier For FM Radio

This is the circuit diagram of active antenna amplifier for FM radio device. With only…

5 years ago

400 Watt 70 Volt Amplifier

This is the schematic design of 400 Watt 70 Volt amplifier capable to deliver about…

7 years ago

150W Power Amplifier using Transistor

This is the circuit diagram of 150W power amplifier which built using power transistors. The…

7 years ago

1000W Stereo Audio Amplifier with Transistors 2SC5200 and 2SA1943

This is the circuit design of 1000W stereo audio amplifier. It is a very good…

7 years ago

150W Car Audio Amplifier

This is the circuit design of 150W car audio amplifier. The circuit is divided in…

7 years ago