Power Supply Circuit-40 Volts-2A
LM317 is a widely used linear voltage regulator. It has 3 pins; input, output and adjustment. LM317 are energy wasters and always require a heat sink to keep the temperature of the circuit low. But due to its simplicity LM317 find a place in a wide range of power supply units.
This project aims at making a power supply circuit using the above-mentioned voltage regulator.
This is a power supply circuit diagram of 40Volts, that is able to deliver 2A current. This circuit is suitable for power amplifiers. Transistor TIP 42 A is used as a pass transistor to increase the current capabilities. Voltage regulator LM 317 is the heart of this circuit. Here the out put voltage is set to 40 V by R5 & R8. If you want any other out put voltage use a 10 K pot instead of R5 and adjust it.
R1_______________3R9 1 or 2W Resistor
R2______________ 22R 1/4W Resistor
R3_______________6K8 1/4W Resistor
R4_____________ 220R 1/4W Resistor
R5_______________4K7 1/2W Resistor
C1____________ 3300µF 50V Electrolytic Capacitor (or 4700µF 50V)
C2,C5__________ 100nF 63V Polyester Capacitors
C3______________ 10µF 63V Electrolytic Capacitor
C4_____________ 220µF 50V Electrolytic Capacitor
D1_____ Diode bridge 4A
D2___________ 1N4002 Diode
D3______________ LED Any color
Q1____________ TIP42A Transistor
T1_____________ 230V Primary, 40V 2A ,Secondary,
If diode bridge is not available, make one using four 1N 4007 Diodes.