Audio Amplifier 90-100W with 2N3773
Audio Amplifiers

Audio Amplifier 100W or 130W

Output can use 2(out=90W) or 4(out=130W) audio power transistors.

100W audio amplifier schematic

PCB and layout

100W PCB
100W audio amplifier components layout

Use T3 on Heatsink

Component Ref./Value Type
R1120K1/4W Resistor
R23K3 1/2W Resistor
R35K6 1/4W Resistor
R43K3 1/4W Resistor
R5680R 1/4W Resistor
R6120R 1/4W Resistor
R73K3 1/4W Resistor
R81K2 1/4W Resistor
R92K7 1/4W Resistor
R101K5 1/4W Resistor
R11680R 1/4W Resistor
R12120R 1/4W Resistor
R13120R 1/4W Resistor
R140,33R 5W Resistor
R150,33r 5W Resistor
R1610R 1W Resistor
R1710R 1W Resistor
C110uF 16V Electrolytic Capacitor
C2330µF 16V Electrolytic Capacitor
C3470uF 35V Electrolytic Capacitor
C4150pF Ceramic Capacitor
C5100nF 100V Polyester Capacitor
RV11K Trimpot
D19V1 - 500mW Zener
T1BC557 PNP transistor
T2BC557 PNP transistor
T3BC548 NPN transistor
T4BD137 NPN transistor
T5BD137 NPN transistor
T6BD138 PNP transistor
T72N3773 NPN transistor
T82N3773 NPN transistor
L1coil largest number of turns rolled in R16 with AWG22

Power Supply

100W audio amplifier PSU schematic PSU PCB
Component Ref./Value Type
T130+30 - 3,5A Transformer
D1-D2-D3-D4Rectifier 5A - 150VDiode
C1-C24700uF 50V Electrolytic Capacitor
F1-F23AFuse
C3-C4100nF100V Polyester

Audio Output and Heatsink

heatsink and board conections

4 transistors 130 W

heatsink and board conections