In Amateur radio practice there is often the need for powerful the power source with an output the voltage of the car the on-Board network. In Fig. 1 the schematic diagram of the power supply.
Secondary the transformer should to be rated at a current of 20 A and a voltage of 20 V. the Diodes of the bridge mounted on the radiators, it is better to use power a diode with a Schottky barrier. Diodes should be working on a voltage below 50 volts and operating current of at least 20 amps. Stabilizer with protection from circuits made on transistors VT1… VT7. Output the voltage shall be trimmer 1K. The error signal amplifier performed on differential cascade VT6, VT7. A repeater on composite transistor VT5 manages regulatory transistors VT1…VT4, emitter circuit of which included leveling resistors of 0.12 Ohm, provides uniform the current distribution on all four transistors (5 And each).
Printed the fee of the device shown in Fig. 2. The network rectifier, the filter capacitors and transistors VT1…VT4 installed outside of the Board. Collectors VT1 to VT4… electrically connected to the case that allows to use the chassis as radiator without isolating spacers.
As VT1…VT4 you can use CT, VT5 - CT, VT6 and VT7 - CT. All - any letter.
Literature
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