Introduction: Simple Audio Amplifier Using Single Transistor

Picture of Simple Audio Amplifier Using Single Transistor

Audio Amplifier is a device which strengthen the weak signal. Usually in audio systems we use amplifiers to drive the speakers of high power rating .

Now , in this Instructables you are going to see how to make an audio amplifier using single transistor to drive the speaker of 10W .

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Step 1: Components Required

Picture of Components Required

Transistor – 2N6292 x1 [ Aliexpress ]

Resistor – 2.2k x1 [ Banggood ]

Capacitor – 22uF x1 [ Banggood ]

3.5mm Jack x1 [ Banggood ]

Speaker x1 [ Banggood ]

Breadboard x1 [ Banggood ]

Step 2: Circuiting

Picture of Circuiting

Pin Configuration of 2N6292

PIN1 - Base | PIN2 - Collector | PIN3 - Emitter

Circuting :

  1. First place transistor on breadboard .
  2. Insert resistor at pin 1 and 2 of transistor .
  3. Insert positive terminal of capacitor at pin1 of transistor .
  4. Insert one wire of 3.5 mm jack at negative terminal of capacitor.
  5. Insert remain wire of 3.5 mm jack at pin3.
  6. Insert one wire of speaker at pin2 .
  7. Connect remain wire of speaker to +5v supply .
  8. Connect ground of power supply to pin3 .

Plug the 3.5 mm jack to any audio playing device and enjoy the sound.

If have any doubts you can check the breadboard traces.

Download the circuit attached .

Step 3: Circuit Construction and Testing

Feel free to comment.

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bassblaster505 made it! (author)2017-11-10

I Used a 2SC1226 with this project. you can run this one much more than 5V. i went all the way to 20V but i started to get some 2V+ DC on the speaker around 15V. this is the most powerful single transistor amp ive made. i mad one a few months back with a single mosfet and only managed about 0.3W from 7V supply.


5V - 0.1W

9V - 0.5W

12V - 0.98W

13.8V - 1.23W

14.4V - 1.42W

16V - 1.94W

20V - 3.7W

Forgot to add, another transistor i had is the 2SC4511 and its preforms WAY better than the C1226 with higher power at lower voltage. BUT it seems to run a bit hotter aswell

DerrickA4mag. (author)2017-10-19

The 5 volt power supply is shown, in the form of a battery, on the far right of the diagram. It's labeled as V1. The positive terminal (+) connects to the speaker. While the drawing is adequate for those familiar with schematic diagrams, this circuit is aimed at a broad audience, where good labeling would be helpful. Note:Though this circuit is wonderfully easy to build, it will drain noticeably more power than modern IC type amplifier designs. Great for learning and demonstrations, but not long term, every day use.

Frameworks101 (author)2017-10-01

Indeed, missing some important information. As Keifd also pointed out; the power supply is important and should be pointed out, or at least been shown in the schematic. Cool thought, transistor amplification is kinda a missed topic these days, due to the (also awesome) op-amp IC's. But some basic, and very interesting, information regarding how transistors work would be a nice addition.

KeifD (author)2017-09-21

You failed to show the power supply.
From the example you made it looks like it is powered by only the phone jack, which is wrong. Plus in your parts list it doesnt show anthing about power suppy. Missing important info!

Anshu AR (author)2017-09-16

I've been playing around with transistors for a while.
This one is fun!

About This Instructable




Bio: 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 ... More »
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