100W Powerful Audio Amplifier Circuit

Contents hide

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, more 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.

TIP122 & TIP127 are Darlington pair NPN & PNP transistor pair. they function like normal NPN/PNP transistors, but since they have a Darlington pair inside they have a good collector current rating of about 5A and a gain of about 1000. They can withstand about 100V across their Collector-Emitter terminal hence they can be used to drive heavy loads.

PCBWay commits to meeting the needs of its customers from different industries in terms of quality, delivery, cost-effectiveness, and any other demanding requests. As one of the most experienced PCB manufacturers in China. They pride themselves to be your best business partners as well as good friends in every aspect of your PCB needs.

5$ PCB Prototype

https://www.youtube.com/watch?v=O3wVJjCVV1c&feature=youtu.be

Hardware Components

The following components are required to make 100W Powerful Audio Amplifier Circuit

S.no	Component	Value	Qty
1.	Darlington Transistors	TIP122, TIP127	2
2.	Audio Jack	3.5mm/male, female	1
3.	Smartphone	–	1
4.	Terminal block connectors	–	2
5.	Loudspeaker	8 Ohm	1
6.	Potentiometer	10K	1
7.	Electrolytic Capacitor	470uF	1
8.	Resistor	150K	1
9.	Jumper Wires	–	As per need
10.	DC Battery with clip	–	1

TIP122 Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of TIP122

TIP127 Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of TIP127

Working Explanation

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. Transistor Q1 amplifies the signal & sends it to the base of the transistor Q2.

The TIP127 further amplifies the input signal & directs it to an audio output device such as a loudspeaker. You can adjust the intensity of the output audio signal by simply tuning the 10K preset pot.

Applications

Used in devices such as MP3 players, megaphones, etc.
They have also found their way into militaristic applications such as acoustic weaponry.
Also commonly used in live music performance, production, and recording.