This is an easy made, really simple and low cost mini audio amplifier based on integrated circuit LM380. Of course the main part of this amplifier is LM380 itself. This LM380 audio amplifier is simple and easy to built because of the simple circuit design which use minimal external components.
The the above amplifier circuit shows the LM380 in non-inverting mode, with the inverting input left open (the inverting input may also be tied to ground, either directly or through a resistor or capacitor). C2 is used to decouple Vcc from ground. The optional RC circuit at the output (pin 8) is used for added stability, for example, to remove/reduce oscillations in an RF-sensitive application.
How to make the circuit can have a variable gain..? It's very easy, just add a potentiometer across the inputs of the LM380 (pin 2 and pin 6). Rv can be varied to modify the gain of the audio amplifier. Look at to the following circuit design:
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