Low power power supply. Scheme, description

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Low power power supply. 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 low-power power supply is designed to power portable transistor receivers, measuring instruments and other low-power devices from the mains. Transformer T1 has a transformation ratio equal to 1 and serves only as a separating one to create the safety of using the power supply. The R1C1 chain served as a mains voltage limiter.

Low Power Supply

The table shows the data for two versions of the power supply.

In the first of them, at the output of the block at a voltage of 9 V, it is possible to power a load that consumes 50 mA; in the second variant, at the same output voltage, a current of up to 20 mA can be obtained. In the first version of the block, the core of the transformer is rod, it is recruited from L-shaped plates. The windings are placed on opposite rods. If, when receiving powerful stations, an alternating current background is heard, you should turn the X1 plug in the power outlet or ground the common positive wire of the unit.

designation	Option 1	Option 2
T1	Core 6,5x10, window 25x11 mm. The windings contain 850 turns of PEL wire with a diameter of 0,22 mm.	Core W6x8, window 6x15 mm. the windings contain 1100 turns of PEL wire with a diameter of 0,12 mm.
C1	2,0x300 V	0,5x300 V
V1	D815G	D814G
V2	D815G	D814G
R2	51 ohm 0,5W	150 ohm 0,25W
C2	400,0x15 V	80,0x15 V

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