2N3055 Power Amplifier
Simple and low cost. The optimal supply voltage is around 50V, but this amp work from 30 to 60V. The
maximal input voltage is around 0.8 - 1V. As you can see, in this design the components have a big
tolerance, so you can build it almost of the components, which you find at home. The and transistors can
be any NPN type power transistor, but do not use Darlington types... The output power is around 60W.
Some comments: - capacitor C1 regulates the low frequencies (bass), as the capacitance grows, the low frequncies are
getting louder. - capacitor C2 regulates the higher frequencies (treble), as the capacitance grows, the higher frequencies
are getting quiter. - 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 500ohm; 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...
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