The transformer uses the secondary winding of 25-35 volts and at a current of 5 A the output voltage is reduced not by much. Two capacitors connected in parallel 4700mkf provide a low ripple factor before the integral voltage regulator on the LM338. Potentiometer P1 can change the power supply from 1.5V to 25V. It is convenient to establish two potentiometers for coarse and consistently smooth adjustment of the tension. Double switch SW2 connects or disconnects a current executed on the chip LM317. Current regulator can limit the output current power supply in the range 0 … 1.5 A.
Current |
Resistor |
20 mA |
62 Ohm |
30 mA |
43 Ohm |
40 mA |
33 Ohm |
80 mA |
16 Ohm |
350 mA |
3.9 Ohm |
750 mA |
1.8 Ohm |
1000 mA |
1.3 Ohm |
Power supply current stabilization mode is useful for charging batteries up to 15AH.
The instrument used a voltmeter to 30V and the ammeter to 5A.
Both devices are equipped with a heatsink that tend to heat up, especially for large values of output current, it is desirable to use thernal grease. Using a different heatsink and no contact with each other. Good Thermal ensure reliable operation. Boards, transformers and all the controls and displays are placed in a large case and has holes for air circulation.
Author: Andrey Veselov
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