About The Circuit
Given below is a 100 Watts sub-woofer amplifier that has been designed only with the use of transistors. There are mainly seven transistors, in which two of them are used in the pre-amplifier stage and four of them in the output stage.
The greatest advantage of this type of a circuit is that there are no IC’s used and so is easy to assemble on a PCB. This circuit is designed to produce 100 Watts output and an input power of +35V/-35V, 5A dual supply is to be used. The size of the sub-woofer depends on the outpu and a normal specification of 12 inch is required. It must be noted that the transistors Q4, Q5, Q6 and Q7 are fitted along with heat sinks. The electrolytic capacitors used here should have a rating of 100 Volts.