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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 2! type connected at the end

terminals for 24V 1! output. !fter rectification and filtering a constant reference voltage is

obtained by the 24V "00m# $ener diode.

PARTS LIST

R1 1kΩ 0.5W

R2 820Ω 0.5W

R3 0.6Ω 1W

VR1 470Ω LIN

VR2 10K LIN

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VR3 10Ω 1W

C1 2200µF 50V

C2 200µF 50V

D1 5A Diod !"id#

D2 2A Diod

D3 24V 500$% &'"

 T1 2N 3055

 T2 SL 100

 T3 !C 148!

(1 S)C 24V* 1A+P

The pots used for voltage variation are 2%mm carbon-film linear type and for current limit 10

ohm 1w wirewound type is used. !ll the components can be connected on a group board.

&ecessary heatsin's should be provided for both ()100 and 2&%0"".