The following power supply circuit uses IC LM317T. This Regulated power supply is suitable for using with Mosfet audio power amplifier 18W and Audio Preamplifier with Tone Control.
A very good and powerful Regulated Power Supply section was implemented by simply adding a PNP power transistor to the excellent LM317T adjustable regulator chip. In this way this circuit was able to deliver much more than the power required to drive two Mini-MosFet amplifiers to full output (at least 2Amp @ 40V into 4 Ohm load) without any appreciable effort.
Regulated Power Supply Parts:
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 100V 4A
D2=1N4002 200V 1A Diode
D3=LED Any type and color
IC1=LM317T 3-Terminal Adjustable Regulator
Q1=TIP42A 60V 6A PNP Transistor
SW2=SPST Mains switch
T1=230V Primary, 35-36V (Center-tapped) Secondary,
50-75VA Mains transformer (See Notes)
PL1=Male Mains plug with cord
See more : 13.8 Volt 30 Amp power 20 Amp power 12 Amp power supply and Appliance Status Monitor
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