3-30V 3A Adjustable Regulated DC Power Supply

A power supply for all general circuits, Based on a stablized DC voltage of 30 volt

This power supply is meant as an auxiliary or as a permanent power supply for all common circuits based on a stabilized DC voltage between 3 and 30V provided that the consumption does not exceed 3A. Of course this power supply unit can also be used for other purposes. Be replacing the trimmer by a potentiometer, it may even be used as an adjustable power supply unit. A good quality heatsink must be used.

Picture of project:
 3 -30 volt dc 3 ampere power supply schematic circuit diagram
3 TO 30 Volt 3 Ampere DC Power Supply
Circuit diagram:
 3 -30 volt dc 3 ampere power supply schematic circuit diagram
3 TO 30 Volt 3 Ampere DC Power Supply Circuit Diagram
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
C5 = 10KuF-60V
D1-D6 = 6.6A
Q1 = MJ3001 (Darligton)
IC1 = UA723D

Specifications:

Assembling into a housing:
Notes :
  1. Connect a voltage meter to the points ‘GND’ and ‘+OUT’ and adjust ‘RV1’ until the desired output voltage is reached.
  2. Apply some thermo-conducting pasta to the bottom side of the transistor and mount it on the heatsink.
  3. If you need 3-8 volt then R2 will be 5.6K
  4. If you need more than 8 volts then the R2 will be 2.2K
  5. Suitable transformer 30vAC at 120VA