Small-sized simple power supply, 220/6-9 volts 0,25 amps. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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The power supply described below can be used for portable and small-sized radio devices (radio receivers, radio tape recorders, tape recorders, etc.).
Technical data:
- Output voltage - 6 or 9 V
- Maximum load current - 250 mA
The power supply has a parametric current stabilizer and a compensation voltage regulator. Therefore, he is not afraid of a short circuit in the output, and the output transistor of the stabilizer practically cannot fail.
The power supply circuit is shown in the figure. The parametric current stabilizer includes the R1C1 circuit and the primary winding of the T1 transformer. The compensation voltage regulator is assembled on the elements R2, VT1, VD2, VD3, VD4.
The description of the operation of the circuit has been repeatedly described in the literature and is not given here.
LED VD5 (red) with ballast resistance R3 is used to indicate the health of the power supply.
Details:
- C1 - any small-sized paper with a nominal value of 0,25 microfarads x 680 V;
- C2, C3 - 1000 uF x 16 V;
- VD1 - KTS407A;
- VD2 - D18;
- VD3 - KS139A;
- VD4 - KS156A;
- VD5 - AL307A, B;
- VT1 - KT805AM;
- T1 - magnetic circuit Ш12 x 18, primary winding 2300 turns with PEV-0,1 wire, secondary - 155 turns with PEV-0,35 wire.
The power supply fits into the plug-case from an imported adapter.
Author: O.G.Rashitov, Kiev
See other articles Section Power Supplies.
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