Power supply, 0-12 volts 0,3 amperes. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Power supply, 0-12 volts 0,3 amperes. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Power Supplies

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The power supply operates on an alternating voltage of 12 V. The rectifier of the power supply is formed by diodes VD1 ... VD4 connected in a bridge circuit, and the rectified voltage stabilizer is formed by capacitors C1, C2, a zener diode VD5 and transistors VT1 and VT2. The voltage at the output of the power supply in the range from 0 to 12 V is regulated by a variable resistor R2. The highest current supplied by the power supply to the load (up to 300 mA) is limited by the allowable forward current of the rectifier diodes.

Power supply, 0-12 volts 0,3 amps

The rectifier can use diodes D226 or D7 with any letter index. Variable resistor R2 - with a power switch, preferably group A, so that its scale, on which the voltage at the output of the power supply is set, is uniform. In the stabilizer, instead of the MP39 transistor, you can use MP40 ... MP42 transistors, and instead of P213 - P214 ... P217, P201, P4 transistors with any letter indices. The transistor gain must be at least 15.

Zener diode D813 can be replaced with zener diodes D811, D814G or D814D. The highest voltage at the output of the power supply will correspond to the stabilization voltage of the zener diode used in the unit. The scale of the resistor R2 should be calibrated using a reference voltmeter connected to the output terminals of the block.

Author: Semyan A.P.

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