Variable Power Supply 0-24V


Variable Power Supply 0 24V

The circuit described here is of an economical smooth variable power supply which offers 0V to 24V. It provides all controls and short circuit protection with acceptable regulation and a ripple free supply and yet uses very few components.

The transformer used is a readily available 12V-0-12V, 2A type connected at the end terminals for 24V, 1A output. After rectification and filtering, a constant reference voltage is obtained by the 24V, 500mW zener diode.

Variable Power Supply 0 24V circuit

PARTS LIST

R1
1kΩ  0.5W

R2
820Ω  0.5W

R3
0.6Ω  1W

VR1
470Ω  LIN

VR2
10K LIN

VR3
10Ω 1W

C1
2200µF 50V

C2
200µF 50V

D1
5A Diode Bridge

D2
2A Diode

D3
24V 500mw zener

T1
2N 3055

T2
SL 100

T3
BC 148B

X1
SEC 24V, 1AMP

The pots used for voltage variation are 23mm carbon-film linear type and for current limit 10 ohm, 1w wirewound type is used. All the components can be connected on a group board. Necessary heatsinks should be provided for both SL100 and 2N3055.


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