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# Simple variable DC power supply circuit

2015-01-10 11:00
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This article describes a simple variable DC power supply circuit. The circuit is very simple, very helpful. If you understand this principle is not very thorough, it is recommended to understand a few important components of the circuit: 2N3055 . The circuit voltage range: 0.7 - 24 v; limiting range: 50 ma - 2 a. P1 you want to set the maximum output current of the power delivered at a given output voltage. P2 sets the output voltage? Must eh? Logarithmic taper, in order to obtain a more linear scale voltage indication. You can choose the transformer according to the maximum output voltage and current needs. The best choice is: 36,40,48 v center tapped and 50,75,80 or 100 va. Capacitor C1 can be 2200 to 6800 years μf, 35 到 50 v. Must be installed in the fourth quarter a good heatsink in order to withstand sustained output short circuit. In some cases, the rear panel of the metal box, you will be surrounded in this circuit can do the job. 2N3055 transistor (Q4) can be replaced by slightly less powerful TIP3055 type.

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```