Power supply for measuring instruments. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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Modern measuring devices can be assembled on transistors, operational amplifiers and digital microcircuits. To power such devices, it is necessary to have a voltage source that provides at least three voltages: 5; 12 and 20 V. One of the options for such a power supply provides voltages close to the mentioned values.
(click to enlarge)
Stabilizers on transistors V5 and V11 are equipped with short circuit protection through zener diodes V2 and V7. In the event of a short circuit, the zener diodes open and limit the collector current of the transistors. After the short circuit is eliminated, the device automatically returns to operating mode.
The circuit used a ready-made transformer TVK-110LM-K (output transformer vertical scanning from TVs). Diode matrices V1 and V6 can be replaced by diodes D226, D237, etc.
The power supply is adjusted by selecting resistors R1 and R4 until the rated current in the load is obtained.
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