40V 2A power supply based on LM317 and TIP42

40V 2A LM317 and TIP42 power supply

A very good and powerful regulated power supply section was achieved by simply adding a PNP power transistor to the excellent LM317T adjustable regulator chip. In this way, the circuit can easily provide far more power than is required to drive two Mini-MosFet amplifiers to full output (at least 2 Amps @ 40 Volts at a 4-ohm load).

R1_______________3R9 1 or 2 watt resistor

R2______________22R 1/4 watt resistor

R3_______________6K8 1/4 Watt Resistor

R4_____________220R 1/4 Watt Resistor

R5_______________4K7 1/2 Watt 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_____Bridge rectifier 100V 4A

D2___________1N4002 200V 1A Diode

D3______________LED Any type and color

IC1___________LM317T Three-terminal adjustable voltage regulator

Q1____________TIP42A 60V 6A PNP transistor

SW2_____________Single-pole single-throw power switch

T1_____________230V Primary, 35-36V (center tap) Secondary, 50-75VA Power Transformer (see notes)

PL1____________ Male power plug with wire