Simple Audio Amplifier Circuits & 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.

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

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

This kit uses the TDA2009 class AB audio amplifier IC for high quality stereo applications.

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

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.

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

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

Schematic for an electronic audio level VU meter that uses LED's to display the volume/audio levels.

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

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

MicroStrip 2.3 GHz (GigaHertz) RF amplifier with 1 Watt RF output power.

A very low cost and simple electronic circuit to generate square, pseudo-sinewave and triangular waveforms in the Audio frequency range. Uses a quad opamp LM348. Good educational kit.

18 Watt Mono Audio Amplifier. Possible to use two for Stereo sound.

Circuit diagram for an AM radio antenna preamplifier that amplifiers the signal before it get to the AM receiver, thus making the AM radio signals stronger for better reception.

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

Dick Cappel's page illustrates an extremely basic small FM transmitter that rebroadcasts sounds using a 1.5 Volt battery. very simple circuit.