60W Power Audio Amplifier with 2N3055


This circuit is simple and inexpensive:

60W Power Audio Amplifier with 2N3055 circuit diagram

This is a class B amplifier, this means, that a current must flow through the end transistors, even if there is no signal on the input. This current can be regulated with the 500Ω trimmer resistor. As this current incrases, the sound of the amplifier gets better, but the end transistors are more heating. But if this current decrases, the transistors are not heating so much, but the sound gets worse.

you can download the document version here



how do I measure the Iq set?