Variable Power Supply 0-30V / 2 mA-3A


This is a variable power supply which adjustable voltage and current output. Voltage output: 0 – 30V
Current output: 2 mA – 3A.
0 30v variable power supply

Component parts list:

R1 = 2,2K Ohm 1W
R2 = 82 Ohm
R3 = 220 Ohm
R4 = 4,7K Ohm
R5, R6, R13, R20, R21 = 10K Ohm
R7 = 0,47 Ohm 5W
R8, R11 = 27K Ohm
R9, R19 = 2,2K Ohm
R10 = 270K Ohm
R12, R18 = 56K Ohm
R14 = 1,5K Ohm
R15, R16 = 1K Ohm
R17 = 33 Ohm
R22 = 3,9K Ohm
RV1 = 100K trimmer
P1, P2 = 10K Ohm linear pot
U1, U2, U3 = TL081, op-amp
D12 = LED diode
C1 = 3300 uF/50V
C2, C3 = 47uF/50V
C4 = 100nF
C5 = 200nF
C6 = 100pF
C7 = 10uF/50V
C8 = 330pF
C9 = 100pF
D1, D2, D3, D4 = 1N5402, 1N5403 or 1N5404
D5, D6 = 1N4148
D7, D8 = 5,6V Zener
D9, D10 = 1N4148
D11 = 1N4001 diode 1A
Q1 = BC548 or BC547
Q2 = 2N2219
Q3 = BC557 or BC327
Q4 = 2N3055

Technical Specifications:
Input Voltage: 24 VAC
Input Current: 3 A (max)
Output Voltage: 0 – 30V
Output Current: 2 mA – 3A
Output Voltage Ripple: 0.01 % maximum

Features:

  • Reduced dimensions, easy construction, simple operation.
  • Output voltage easily adjustable.
  • Output current limiting with visual indication.
  • Complete protection of the supplied device against over loads and malfunction.

Detail explanation about this circuit, top/bottom PCB layout and step by step guide to build this circuit: visit this page

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