Using this circuit diagram can be built a very simple symmetrical power supply. This symmetrical power supply is very simple and is designed using the L165 chip. L165 chip can convert an asymmetric voltage of 6 + 40 V in a stabilized symmetric ± 3 V to ± 20 V.
C1 and C2 will be mounted as close as possible to the chip, and C4 and C5 will be soldered close to the output terminals. Because circuit can provide currents up to about 3 A, is essential to use a proper power wiring and the mounting of IC to a thermal radiator.