Variable DC Power Supply
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Voltage range: 0.7 - 24V
Current limiting range: 50mA - 2A
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Circuit diagram: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
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Device purpose:
" Q4 must be mounted on a good heatsink in order to withstand sustained output short-circuit.
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