Regulated voltage power supply, 220/0-20 volts, 0,4 amps
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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For several years now I have been using two power supplies, which I use as sources when testing and adjusting various designs. I collected them according to descriptions in amateur radio literature.
The first power supply (Fig. 1) is the simplest, it allows you to get a constant voltage at the output (at terminals X2, X20) in the range from almost zero to 0,4 V at a load current of up to 1 A. One of its main parts is a transformer T110 - can be, for example, a vertical scan television output transformer TVK-1,2LM. Its winding I is high-resistance (pins 3,4,5), II is low-resistance (pins 18). Any other transformer is also suitable, providing a voltage on the secondary winding of 20 ... 0,5 V at a load current of up to XNUMX A.
The second block (Fig. 2) is a little more complicated, but it allows you to power the load with a current of up to 1 A. In addition, the output voltage in it can be controlled with a PV1 voltmeter with a scale of 15 V.
Step-down transformer T1 - homemade. For it, you will need a W-shaped magnetic circuit with a cross section of approximately 5 cm2. Winding I should contain 1380 turns of PEV-1 0,12 wire, winding II -135 turns of PEV-1 0,55. You can also use a ready-made transformer that provides a voltage of 15 ... 18 V on the secondary winding at a load current of about 1,5 A.
So that powerful transistors (P213A and KT805A) do not overheat, they must be installed on commercially available finned heat sinks or made by yourself from an aluminum plate 2 ... 3 mm thick and approximately 100x100 mm in size.
Author: V.Dokukin
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