How to Make Simple Audio Amplifier With Mosfet




About: HI! I am Junez Riyaz, currently doing Bachelor of Technology in the field of Electronics and Communication Engineering. I am much interested in inventing something new yet from my childhood. In my leisure ti...

An Audio amplifier is a device , which is a capable of strength the week signals to drive the speaker.

In this Instructable I will instruct you to make your own simple audio amplifier using MOSFET and less number of components. The Transistor I used is IRFZ44 which is a Mosfet.

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Step 1: Components Required

IRFZ44 Transistor - 1 [Banggood]

Speaker - 1 [Banggood]

100uF Capacitors - 1 [Banggood]

1K Resistors - 1 [Banggood]

Bread Board - 1 [Banggood]

3.5mm Audio Jack - 1 [Banggood]

Step 2: Watch Video First!

The video gives you all the information you need to build your own simple audio amplifier with MOSFET.

During the next steps however I will present you some additional information to make the project even more simpler.

Step 3: Circuiting

Here you can find the circuit on breadboard.

You can see my breadboard traces and it is easy to understand while making. Place all the components on the breadboard according to schematic.

Circuit is attached , you can download.

Step 4: You Made It !

That's all guys you made it.

Feel free to comment.

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Visit my website Electronics Projects Hub

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3 Discussions


1 year ago

I've simulated it in LTspice.

Distortion: 2.2% in all frequencies (20 to 20kHz) @ 1Vrms input

Power output: 800mW @ 4 ohm - 1Vrms input

Only a problem: continuous +850mV and 180mW power output without input signal in the speaker.


1 year ago

I recently came into possession of a pair of 8 ohm 3-5 watt speakers. and I have two amps wired in parallel for stereo sound, and work extremely well


2 years ago

The IRFZ44 is rated up to 40W. It would be interesting to see someone with the math know how to calculate the watts of this project.