Audio Amplifiers: Audio Amplifier Circuit Schematics

1 Watt Audio Amplifier. 8 Ohms impedance. 20 Hz to 20 kHz. Small, few components.

This simple stereo audio amplifier will amplify audio for your low-medium impedance headphones and give you left/right balance control

Describes the schematic (circuit diagram) and PCB (Printed Circuit Board) for a cheap 100-150 Watt audio amplifier with few components.

This audio amplifier electronic circuit uses MOSFET transistors to create more than 25 Watts output power. Uses IRF530 and IRF9530 MOSFET transistors.

Shows an electronic circuit diagram (schematic) for a simple 10 Watt audio amplifier, using only 4 transistors.

PCB plans and circuit diagram (schematic) for what appears to be an extremely nice 100 watt guitar amplifier. Includes preamplifier and power amplifier circuit diagram and PCBs

Variable gain audio amplifier capable of powering a small speaker for personal use

Amplifier circuit for electret microphones (condenser microphones). Amplifier the audio signals picked up by the electret microphone, using 741 op-amp and a 2N2222 transistor.

High quality 25 watt audio amplifier. Combining 2 would give a 50 watt stereo amplifier.

A Mono audio amplifier which produces a very good 7 watts output power.

2 channel (Stereo) Audio Amplifier with 1 watt per channel.

2 watts of power across to channels is what this kit delivers. Great quality.

Amplify tiny audio signals fifty times with this electronic kit, and deliver them to a power amplifier cleanly and undistorted. AGC (automatic gain control) eliminates distortion. This circuit is useful in boosting the output from tape heads, microphones

This high gain earphones amplifier electronic circuit has a microphone, the sound from which it amplifies by a very high level so you can listen things to with lower volume easily.

An extremely good stereo tube amplifier which produces 90Wrms per channel.

Stereo 3 Watt Amplifier kit that powers two 4 or 8 Ohm speakers.