Power supply for home laboratory, 0-30 volts 4 amps. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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Power supply specifications
Output voltage: 0 ... 30 V.
Output current: 4A
Power supply unit assembled according to the traditional scheme, a little with an unusual inclusion of a microcircuit. Due to this inclusion, it was possible to obtain a lower limit of the output voltage of 30 mV, which will be reflected on the indicator as 0V.
Transistor VT 2 is desirable to use composite. Resistor R 10 regulates the upper limit of the output voltage. The protection unit is assembled on transistors of different structures and represents an analogue of a thyristor. Resistor R 1 regulate the current protection threshold. In some cases, a resistor R 4 is selected.
Resistor R 4 - 5 watts at 0,22 ohms. The protection node works both for short circuit and for overcurrent. Resistor R 8 is used with dependency A.
Power transformer, with a power of 100 W and more, with a voltage on the secondary winding of at least 27 V and rated for a current of 5-6 A.
Printed circuit board 90 x 62 mm.
There are no analogues of the LM 723 chip.
The layout of the elements for the power supply
Power supply circuit board
Author: A.Patrin, Kirsanov, Tambov region, patrin@tamb.ru; Publication: cxem.net
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Comments on the article:
nik
I hope that there will be no difficulties when repeating [up]
Urok
The power supply started up without problems, excellent stabilization, but the lower voltage limit is 3,6 V. By selecting resistors, you can reduce to 1,5V, but the upper limit is also reduced. How to achieve 30 mB?
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