Powerful power supply for transmitters from a personal computer power supply unit. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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From the power supply of a personal computer, you can make a sufficiently powerful switching power supply for amateur radio devices, for example, for a CB radio station with a power amplifier. In some cases, it is cheaper to buy a "second hand" power supply from a PC than a ready-made power supply for the same power (up to 200 W)!
The modification is as follows:
1) In the power transformer (in the diagram - T3) "rises from the ground" output "0".
2) All elements relating to voltages + 12V, -12V and -5V are thrown out of the circuit.
3) The matrix (2 powerful pulse diodes) connected to terminals 9-10 and 7-8 is thrown out.
4) Instead of diode matrices, a bridge (VD16, VD17, VD19, VD20) is mounted on the radiator from domestic KD2997A diodes.
5) The required output voltage is set by selecting resistors R31, R32, R33.
Power supply circuit (81 Kb)
This circuit is all that remains of the PC power supply as a result of the alteration.
According to this technique, many power sources used to power transmitters were redesigned. There were no problems on the receiving side.
Publication: N. Bolshakov, rf.atnn.ru
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