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Wednesday, August 26, 2009

Variable DC Power Supply

A Variable DC Power Supply is one of the most useful tools on the electronics hobbyist's workbench. This circuit is not an absolute novelty, but it is simple, reliable, "rugged" and short-proof, featuring variable voltage up to 24V and variable current limiting up to 2A. Well suited to supply the circuits shown in this website. You can adapt it to your own requirements as explained in the notes below.


Variable Power Supply


Parts:
P1____________500R Linear Potentiometer P2_____________10K Log. Potentiometer R1,R2___________2K2 1/2W Resistors R3____________330R 1/4W Resistor R4____________150R 1/4W Resistor R5______________1R 5W Resistor C1___________3300µF 35V Electrolytic Capacitor (see Notes) C2______________1µF 63V Polyester Capacitor D1,D2________1N5402 200V 3A Diodes D3_____________5mm. Red LED Q1____________BC182 50V 100mA NPN Transistor Q2____________BD139 80V 1.5A NPN Transistor Q3____________BC212 50V 100mA PNP Transistor Q4 __________2N3055 60V 15A NPN Transistor T1_____________220V Primary, 36V Center-tapped Secondary 50VA Mains transformer (see Notes) PL1____________Male Mains plug SW1____________SPST Mains switch Notes: * P1 sets the maximum output current you want to be delivered by the power supply at a given output voltage. * P2 sets the output voltage and must be a logarithmic taper type, in order to obtain a more linear scale voltage indication. * You can choose the Transformer on the grounds of maximum voltage and current output needed. Best choices are: 36, 40 or 48V center-tapped and 50, 75, 80 or 100VA. * Capacitor C1 can be 2200 to 6800µF, 35 to 50V. * Q4 must be mounted on a good heatsink in order to withstand sustained output short-circuit. In some cases the rear panel of the metal box in which you will enclose the circuit can do the job. * The 2N3055 transistor (Q4) can be replaced with the slightly less powerful TIP3055 type

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