General-Purpose AF Power Amplifier

This is a schematic diagram of general-purpose audio frequency (AF) amplifier circuit. This circuit uses cheap 1/4-W  resistors, no high precision needed so 5%-tolerance of carbon or metal film units is good enough. This circuit has frequency response range from 16Hz to 30kHz.  This amplifier also accepts standard automotive battery supply voltage range: 12 to 14 V. The gain of this circuit is up to 70db. Beside that, this circuit has input impedance of 50 Kohm that would be sufficient for many applications. Here is the schematic diagram of the circuit:

[Circuit’s schematic diagram source:]