Universal low voltage power supply. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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In practice, very often voltages from 3 to 12 V are required to power various devices. The described power supply allows you to obtain voltages of the following series: 3; 4,5(5); 9; 12 V at load current up to 300 mA. It is possible to quickly change the polarity of the output voltage.
The output voltage is adjusted in steps using the SA2 switch (see figure).
Switch SA3 can change the polarity of the output voltage. Diode VD2 type AL 102 is included in the stabilization circuit of the reference voltage R1, VD2, VD3 and signals its presence. The stabilized voltage (selected by switch SA2) is applied to the base of transistor VT1. Transistor VT2 for reliable operation must be installed on a small radiator.
The power supply does not have output short circuit protection. But practice has shown that the KT819 transistor can withstand a short circuit for 15 ... 17 s. And with a load current of more than 300 mA, the VD2 LED reduces the brightness of the glow, which indicates an overload.
Transformer T1 has a Sh16x16 core, the primary winding is 3000 turns of PEV 0,1 wire, the secondary winding is 260 turns of PEV 0,31 wire.
Block dimensions 90x70x45 mm.
Author: O.G.Rashitov, Kiev
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