Two positive voltage regulator modules assemble a positive and negative regulated power supply

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Two identical 100W 18V E-type power transformers were found, which were respectively rectified and filtered into two DC 24V. They were used to power two W-2 voltage regulator modules and then stringed together to form a positive and negative power supply. First, make a dummy load on the output and two resistors with the same resistance value of more than 200 n. After connecting the power supply, the coarse adjustment is 20V, and then the resistor is removed to access the amplifier. W-2 heat is serious. After adding the insulation sheet, it is fixed on the same heat sink of the power amplifier. Finely adjust it to 20V with a digital multimeter, then connect to the CD to increase the volume. At this time, the positive and negative power supply wires do not move. When I stopped the CD, I couldn't hear a little voice and I was done.

The difficulty of this power supply is to have two identical transformers, or one transformer with the same output voltage and completely separated windings. Most power amplifiers, including finished machines, have no voltage regulation, only increase the transformer and increase The capacity of electrolytic capacitors is not acceptable.

The precision regulator TL431 is used in the W-2 module, so the requirements for the power transformer are also reduced. As long as the capacity and voltage are satisfactory, they do not have to be exactly the same. The two transformers used, because they are self-made, have slightly different output voltages, but there are modules that can be used to meet the standards of use.