Wiring & diagram Info

This schema is simple and inexpensive:

This is a class B amplifier, this means, that a current must flow through the end transistors, even if there is no signal on the input. This current can be regulated with the 500Ω trimmer resistor. As this current incrases, the sound of the amplifier gets better, but the end transistors are more heating. But if this current decrases, the transistors are not heating so much, but the sound gets worse.

you can download the document version here

50W Amplifier Circuit, built based ICL8063 as power transsistor driver and 2N3055 as main power amplifier component.

50W Amplifier Circuit based ICL8063 + 2N3055 schematic diagram:


Parts List:

R1 = 200 Ohm R2 = 200K R3 = 30K R5 = 1K R6 = 5K R7, R10 = 1 Meg R8,R9 = 0.4 Ohm/5Watt R11 = 10K Potensiometer R12,R13 = 51K R14 = 47K C1 = 100uF/35V C2 = 0.011uF C3 = 3750pF C4,C6 = 1000pF

C5,C7,C8 = 0.001uF C9 = 50pF C10 = 0.3uF C11,C12 = 10.000uF/50V U1,U2 = 741 Op Amp U3 = ICL8063 Audio Amp Transister Driver Q1 = 2N3055 NPN Power Transistor Q2 = 2N3791 PNP Power Transistor BR1 = 250 V 6 Amp Bridge Rectifier T1 = 50V Center Tapped 5 Amp Transformer S1 = SPST 3 Amp Switch S2 = DPDT Switch F1 = 2 Amp Fuse SPKR1 = 8 Ohm 50W Speaker

Circuit Notes:

• Distortion is much less than 0.1% up to 100HZ and increases to about 1% at 20kHz.
• 50V CT transformer might be difficult to find, you may use 45V or 32V CT transformer.
• Q1 and Q2 should be use heatsinks to prevent over heating.

50W Amplifier Circuit based ICL8063 + 2N3055 source page