How to Make Simple But Powerful Audio Amplifier Using One Transistor [DIY]

This simple audio amplifier circuit uses just one MOSFET transistor, it is easy to build but yet it is pretty powerful. It is probably the best what you can make using just one transistor.
How powerful is it? Well, it depends on the light bulb, you can easily get 10W from it.
In theory, you can get even 100W from it, but it will generate a lot of heat so it is not worth it.
What do you think about this device? Have any questions? Tell me in the comments below.

[samk]

I made your simple but very interesting project last night and it was fantastic. The sound quality is remarkably good and the sound level is big enough to hear from the adjoining room, even after the door is closed. But I did some changes to your original design to suit my expectations after doing some calculations and following trial and error method. I achieved the best result by the following changes,
I did not use 12V power but used only two 18650 batteries (about 7V) as I always prefer to use 18650 in my small projects. I replaced the light bulb with an 8.2 Ohm 7W wire wound resistor. Used a 4700 MFD capacitor to couple the speaker. Used two 3.3 kilo Ohm resistors to make the stereo sound source to the mono amplifier input.
Even at a fairly high volume level, two batteries ran for more than 4 hours to show a noticeable power loss. Heat generated by the resistor and MOSFET was hardly noticeable. Hoping to build the stereo version in the future.
This is truly a good project for kids and Tronics beginners.
Thanks for publishing this wonderful project.

[martin_racz_a_szerelo]

This is one of the best circuit i ever seen!!! Most of them here in youtube are fake, but this one is really like heaven!! I give you a 5 star rating

[markturner]

This method by far is the most straightforward and best! This has been & will always my "go to"!
Keep up the good work and thank you for sharing. Please continue with more tutorials.

[andychu]

Very illustrative with schematic unlike most other postings. Thanks.

[korrige]

Thank you very much for sharing..Jamaica..yeah man.

[jeffvlaggags]

This video make sense thankyou ☺️ i watch many videos and just get depressed of fake videos .

[foxbatmig]

Neat one, thank you for your presentation, I have 5v 1500mA power source, 102H transistor and S9014 transistor. Please give me some advices, which types and values of bulbs, resisters and capacitors should I use .

[ourchannel]

nice...but have a noise vibration sound...or just in recording

[chrisclassical]

very impressive, from the perspective of a novice this is like magic.

[johnwaltersalas]

Can i use two of these for a double impedance speaker?

[bentennyson]

Thanks for this video.
It's very simplified..
Please how can I make a bigger one?

[mongiesacedor]

How much the input volt and what speaker capacity (in watt) are you using ?

[IWillBrutalyRemoveYourBalls]

Can you make one with a lot less distortion?

[gerryroberts]

My vintage cutter runs on a Light bulb, but it plays in sync with the speaker. well its supposed to be.. i m not sure to wire it direct with a 5 k resister and then branch the speaker off of that, .,

[walzaoft.silvasilva]

Gostei do amplificador é muito bom ok Fais um amplificador com transformador de áudio ok, vou esperar esse vídeo Okay

[loiktum]

Hi good day. Can I use 16v AC transformer and convert to 16v DC ?

[stefanthomaspambid]

can i ask what sizes of wires did you used?

[thomasr.]

Ok, this circuit definitely works. But mine had terrible audio quality. Very low bass and it is not very loud. I swapped out the 4.7uF input decoupling cap and put in a 47uF. It's much better now but still not very loud. Speaker is 4 Ohms.
Also there is a quite loud humming noise that is aprox. as loud aß the music when my phone ist fully turned up. Any idea how to get rid of that?
But anyway, nice little project.

Edit: got it. Added a 100nF cap in parallel to the powersource and switched to a 12/5A supply. With an adequate headphone preamp it gets damn loud. But with heavy distortion but still listenable.

[ivanurban]

It is drawing 1amp under no load, do you know why?

[napatencie]

I make this amplifier in stereo version at night. IT has a very good sound but i have a problem. When i put a Jack into the phone, from loudspeakers i can hear a noise. On my tablet it is the same. What can i do with it?