The power supply is universal. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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This power supply is simple in execution (Fig. 1, a). The voltage in it can be adjusted on the zener diode (adjustable analogue of the zener diode Fig. 1, b). In the zener diode VDx, the stabilization voltage can be adjusted by resistor R2. Selecting its resistance, set any stabilization voltage in the range from 1 to 20 V.
The power supply works as follows. When the AC voltage transformer T1 (220 V) enters the primary winding, the HL1 "Network" LED lights up, and when the FU1 fuse blows, the HL2 LED lights up. From the secondary winding of the transformer T1, an alternating voltage is supplied to the diodes VD1-VD4 (D226). The rectified voltage through the smoothing capacitor C1 is supplied to the stabilizer (VT1, VT2).
Details. Transformer T1 type TVK110L2 or any other with an output voltage of 12 V (approximately), transistor VT1 type P213B can be replaced with P213-P217B, all other transistors should not be changed. Incandescent lamp H1 24 V, 10 W.
This power supply is convenient and practical. The placement of the device elements is shown in Fig.2.
Author: S. S. Krisan
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