As described below, the power supply can be used for portable and small-sized radio devices (radios, stereos, tape recorders, etc.).
Technical data:
- Output voltage - 6 or 9 In
- The maximum load current of 250 mA
The PSU has a parametric current stabilizer and compensation a voltage regulator. Therefore, he is not afraid of a short circuit on output, and the output transistor of the regulator almost can't fail.
The diagram of the power supply shown in the figure. Parametric current stabilizer includes chain R1C1 and the primary winding of the transformer T1. Compensation voltage regulator is assembled on the elements R2, VT1, VD2, VD3, VD4.
Description of the scheme has been variously described in the literature and will not be discussed here.
Led VD5 (red) with ballast resistance R3 serves to indication of the operability of the power supply.
Details:
- S1 - any small-sized paper with a nominal value of 0.25 UF x 680;
- C2, C3 - 1000 µf x 16 In;
- VD1 - CCA;
- VD2 - D18;
- VD3 - XA;
- VD4 - XA;
- VD5 - ALA, B;
- VT1 - CHAM;
- T1 - magnetic s x 18, the primary winding of 2300 turns of wire sew-0,1, secondary - 155 turns of wire sew-0,35.
The power supply fits in the case-the import plug from the adapter.
Author: O. G. Rashitov, Kiev