This DC power supply circuit diagram is designed as an additional or as a permanent power supply for all general circuits based on a stable DC voltage between 3 and 30V provided that current consumption does not exceed 3A. Of course, this DC power supply can also be used to other purposes. By replacing the trimmer by a potentiometer, it can even be used as adjustable supply unit. A good quality heatsink must be used.
- Protection against overloads
- Short-circuit steady
- Output current: max. 3A
- Output ripple voltage: 0.5 mV
- Output voltage: adjustable from 3 to 30V, stabilized
- Input voltage: 9 to 30V AC (depending on desired output voltage)
Mounting in an enclosure:
Depending on the transformer used, one can choose one of two housings. If a metal enclosure is used, must be connected to safety purposes. Make sure that the heat sink does not touch the housing, this can cause a short circuit.
If the circuit is to be integrated into another unit, the ventilation holes must be provided, which is required to dissipate the heat.
DC power supply 3-30V 3-30V 3A parts List :
R1 = 8.2K
R2 = 2.2K
R3 = 680R
R4 = 1K
R5 = 82K
R6 = 0.18R/5W
C1 = 470p
C2 = 100nF-63V
C3 = 100nF-63V
C4 = 100uF 63V
10KuF C5 =-60V
D1-D6 = 6.6A
Q1 = MJ3001 (Darligton)
IC1 = UA723D
- Connect a voltmeter to “GND” points and “OUT +” and set “RV1” until the voltage desired output is reached.
- Apply some heat-conductive paste to the lower surface of the transistor and mount it on the radiator.
- If you need 3 to 8 volts then R2 is 5.6K
- If you need more than 8 volts then the R2 is 2.2K