An audio amplifier is a simple electronic circuit that can be used to take in a weak audio signal and then transduce it into a better, powerful, and audible audio signal. Audio amplifiers are now seen in almost every consumer electronic product in some shape, way, or form. Some basic examples would be music players, camcorders, smartphones, laptops, and PCs. In today's article, we are going to go over a step-by-step process on how to build a 100W Powerful Audio Amplifier using the TIP122/127 Darlington pair transistors.
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The working of this circuit is as follows. The thing that makes this circuit unique is the robust & high-power TIP122/127 Darlington transistor pair. Audio input is taken from a general audio transducer such as a mic. This input acts as the DC control signal for the transistor Q1. Here, a capacitor (470uF) acts as a coupling capacitor, blocking the DC component of the signal, allowing only the AC component of the signal to pass through.