0 50W Amplifier Circuit

This is a low cost amplifier made out of discrete components (no IC). The circuit can amplify sound up to 50W and very suitable for stereo or guitar amplifier.

schematic diagram

Part List:
R1 - 10 kilo ohms 1/4W
R2 - 3.3 kilo ohms 1/4W
R3 - 1 kilo ohms 1/4W
R4 - 2.2 kilo ohms 1/4W
R5 - 12 kilo ohms 1/4W
R6 - 1.2 kilo ohms 1/4W
R7 - 22 kilo ohms 1/4W
R8 - 330 ohms 1/4W
R9, R10 - 10 ohms 1/4W
R12, R13 - 39 ohms 1W
D1, D2, D3, D4 - 1N4148 or similar diode
C1, C7 -100nF polyester or Mylar capacitor
C2 - 2.2uF electrolytic capacitor
C3 - 470pF ceramic capacitor
C4 - 47uF electrolytic capacitor
C5 - 22pF ceramic capacitor
C6 - 220nF Mylar capacitor
Q1, Q2 - BC560C or similar PNP transistor
Q3, Q4 - BC556 or similar PNP transistor
Q5 - BC546 or similar NPN transistor
Q6 - BD139 or similar NPN transistor
Q7 -BD140 or similar PNP transistor
Q8 - MJE2955 or similar PNP transistor
Q9 - 2N3055 or similar NPN transistor

Power Supply Circuit
Circuit below is a dual source power supply that will be used  to power the 50W amplifier circuit above.

power supply schematic

Part List:
Xformer - 240V or 110V primary , 25V secondary and rated 100VA
D - KBPC601 bridge or any diode with minimum rating of 6A at 100V
C1, C2 - 3300uF electrolytic capacitor rated 50V

Parts pinout:

2N3055 and MJE2955 pinout

BC560 and BC556 pinout

BC546 pinout