Circuit Project Electronic

The switching power supply provides 12 volts, at 10 amps, maximum, using a discrete transistor regulator with an op-amp functioning as a comparator in the feedback circuit.  Click to View Circuit and read More
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Notes:
Although the 78xx series of voltage regulators are available with different current outputs, you can boost
the available current output with this circuit. A power transistor is used to supply extra current to the load
the regulator, maintaining a constant voltage. Currents up to 650mA will flow through the regulator, [...]

Click Here To View Circuit &PCB Power Amp OCL by 741+2N3055+MJ2955

This is old circuit Power amp OCL, But easy circuit and very nice. To use for play music in your home.
It low cost too.
It use IC 741 or LF351(good) and Transistor x 4 (2N3055+MJ2955+BD139+BD140)
and little component.
Power supply volt +35V/-35V and 3A for Mono, [...]