This symmetrical unregulated power supply is used to feed the
audio amplifier
based on LM1875 amplifier module National Semiconductor. With
symmetrical 30V DC source the amplifier capable of delivering up to 30W
of power using 8 ohm load.
The diagram above shows how the DC +25 V and-25V DC can be obtained. Ready to provide power to two
stereo amplifiers, one 80VA transformer with 240V input and 36V output, with the center tap is used. The output of
the transformer secondary repaired using four 1N5401
diodes and filtered through four
electrolytic capacitors. A fuse and a varistor connected to the main circuit
protection against voltage spikes.
Source
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