How to Make Simple But Powerful Audio Amplifier Using One Transistor [DIY]
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- Опубликовано: 20 ноя 2018
- 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. 
Наука
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
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.
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.
Thank you so much for your feedback. I am happy when it all works as intended.
Thank you for sharing such a good idea
Very illustrative with schematic unlike most other postings. Thanks.
Nice video!Good explanation!
Thanks for sharing
Awesome video
interesting and thank you
Thank you very much for sharing..Jamaica..yeah man.
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 .
Veri good , thenkyu.
Hello, how many ohm does the transistor 8 or 4 ohms work? How much is stable?
Does this project work with the k3878 mosfet? Thx!
Can i use two of these for a double impedance speaker?
How much the input volt and what speaker capacity (in watt) are you using ?
Hi, can use this on a mono record player with ceramic cartridge ? Thanks and advance
Thanks for this video.
It's very simplified..
Please how can I make a bigger one?
Brother I am trying this circuit on transistor BD825 but it's not gonna work so what can I do?
Instead of light I am using 0.22 ohm resistor of 5 w
Is that a 12v power supply?
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.
I like your video, can you please tell me what is the name and what is the voltage of the items?
can i ask what sizes of wires did you used?
This video make sense thankyou ☺️ i watch many videos and just get depressed of fake videos .
Thanks for the positive comment. Absolutely agree, it is disappointing when "free energy generators" get millions of views. I'd rather be poor than make fake.
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?
nice...but have a noise vibration sound...or just in recording
nice
Can you make one with a lot less distortion?
Can you tell me what is the input voltage for this circuit ?
Hello , i have a few questions regarding the amplifier . As i don't have many choices for component's i would like to know if it's fine to use a bit different values before i build this circuit . Is it ok if i use a 2300 uF capacitor instead of a 1000uF one ? Is it ok if i use a 2.2 uF capacitor instead of a 4.7 microfarad one ? And i only have a mosfet this type : SE 9302 ( which is a mosfet used for amplifiers ) is it ok if i use that one instead of the one mentioned in your video ? I am just asking because i don't want to waste my time building it if it wouldn't work with my choice of components . If you can please reply , and have a nice day !
First of all, yes, you can use a bigger cap than the 1000uF as output cap. The bigger, the better bass response you get. On the other side, the input, I am too lazy to do all the calculations for a highpass filter. That is what the input cap forms together with the MOSFET. Choosing a cap too low will result in a bass cut. But I think 2.2uF is still rather high so it should be fine. Even 1uF should not make any difference.
Last but not least: I cannot tell you if your FET will work as well because I don't want to read the datasheets for you. Compare the ratings and try. I guess it will work but it may be that it distorts terribly
Hi good day. Can I use 16v AC transformer and convert to 16v DC ?
It is drawing 1amp under no load, do you know why?
I have some wuestions. I build pair of this, connect to negative (power in and audio in) side but use 2 different positive power in and left right sound in to make stereo? I just build ic-s amplifiers but this is the first try to make an transistor one. I have 4 transistor (if i make mistake i have another) . I think right or bad?
Greetings.
Never tie left and right together. It leads to frequency cancelation and when things really go bad, it can destroy the output stage of your audio source.
Take two fairly low resistors, from 1k to 4.7k (I used 2x 3.3k) and solder one in line with left wire and the positive input of the amp, and the other one in line with the right wire and the positive in. So the resistors are joined on the amp side. That's the simplest stereo to mono mixer.
What if I want to amplify a tiny tweeter in a keyboard?
Gostei do amplificador é muito bom ok Fais um amplificador com transformador de áudio ok, vou esperar esse vídeo Okay
Hi - neat tutorial! What's that stuff you're rubbing on the wires before applying the soldering iron?
Hi, thanks! That is liquid flux (I was applying it using a match). People often use rosin instead. You can mix rosin with alcohol and make DIY liquid flux... or you can buy it.
@@ElectricalProWhatTypeOfAlcohol?
Please make a video for 2bass and 2 front speakers amp
very impressive, from the perspective of a novice this is like magic.
14.2v?
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,.,
TheOutputCouldBeMorePowerfulBetweenTheDrainAndPlus?
This is asome how to make power stuply
The output capacitor is necessary? Many amplifiers don’t have capacitor before the speaker.
Those amplifiers require a bipolar power supply (three wires, e.g. +12V, 0V, -12V), so they don't need a capacitor. There is also another approach by using full H-bridge, but it requires four transistors and a complicated circuit to control them.
Electrical Projects [Creative Lab] Thank you for your answer!
Bro.. what will happen if we connect the circuit without bulb???
Well, if you connect it without bulb current will be too high and... it will trigger over-current protection if your power supply has it... or if you power it from a car battery for example, then something will start to burn.
is it ok to have no light bulb?
my light bulb is 1w 220vac.
Hi, the light bulb is necessary. Moreover, 1W 220V is not enough, please use 12V light bulbs. I recommend using at least 5W 12V light bulb. You can use resistors instead of a light bulb, but the resistors must be powerful because they will dissipate a lot of heat. For example, you can use 24 Ohms resistor, but it must be 6W... you can use many resistors in parallel to get about 24 Ohms and 6W in total.
@@ElectricalPro what kind of resistor to be used?
For example 24 Ohms resistor, but it should be at least 6W (it could be many resistors). For example, you can use four 100 Ohms resistors connected in parallel, each resistor has to be at least 1.5W... so those four resistors connected in parallel will give you 25 Ohms and 6W in total. (I made some mistakes in previews post, I corrected them).
Well, there is no single right answer about a resistor... the point of the resistor is to limit current at 0.5A - 2A, so what resistor to use is up to you. Use Ohm's law to calculate. The higher the current the more powerful amplifier you will get... but high current means a lot of heat.
For example, let say you want 1A at 12V, so using R=U/I we can calculate 12V/1A=12R so when using 12R resistor you will get desired 1A current... but we also need to know how much heat the resistor will make P=U*I, so in our case 12V*1A=12W, so you'll need at least 12W resistor. You probably will not find 12W resistor, it is very powerful, so you will need to use 4 - 20 of the less powerful resistors... you will need to connect them in series or in parallel, it depends on what resistors you have.
I have used a light bulb because it is much simpler.
What is the resistance value of the light bulb?
Using a simple formula to calculate the resistance of something : U(squared) : P = R we can determine the resistnace of the light bulb by doing 12(squared) : 21 = 6,8 Ohms . Have a nice day hope this helped .
How you make 2 Chainz
How many voltage does the amplifier requires??
What is the name of the MOSFET used?
IRF540N was used
@@ElectricalPro ıf am ı use tıp41c transistor is it work
Як ти англійську вивчив?)
Я не вивчив) це процес на все життя. Зроби Англійську частиною життя, тобто дивися фільми Англійською, підпишися на цікаві канали на ютубі які Англійською. Зміни меню телефона (віндовс на компі) на Англійську. Якщо зовсім нічого не знаєш то почни з простої граматики, подивися "полиглот английский за 16 часов", але граматикою сильно не захоплюйся, бо будеш довго думати як щось правильно сказати замість того щоб думати що сказати. Словарний запас я прокачував на Lingualeo. Ну а ще треба мабуть якась мотивація. Просто заставить себе вивчити іншу мову я думаю що не реально, треба насамперед бажання. Не думай про англійську як про роботу, вивчення повинно приносити задоволення. Знайди друзів які теж хочуть вивчити англійську, це буде мотивувати. Все це субєктивно, ну якось так я про це думаю.
Subtitle front of screen n video quality is big problem because I am bigeners
How to make the amplifier__ 2n3055 /2n3773 registrar used
Ну и у тебя акцент....
с каких пор англичане пользуются советскими динамиками 4гд-35? )) автор похоже клоун, с такой простой известной схемой, получить такие искажения при низкой громкости и питании 14 вольт. У меня подобный однотакт на резисторе вместо лампочки прекрасно работает от 10 вольт без искажений и намного большей громкости
Ну да согласен
Что за фигня.
What a joke - the speaker is probably just as loud with the phone plugged directly into it!
Show us the waveforms so we can see if it really *is* amplifying at all.
First of all: I don't have an oscilloscope. Second: It is a classic amplification circuit, except it uses a light bulb instead of a resistor, why wouldn't it work? People don't believe in a one-transistor amplifier, but they happily believe in free energy generators. What a world we live in.
How many watts can I get out of it?
It depends on how powerful lightbulb you use. I don't have the equipment to measure, I guess it is about 5-10W when using 21W lightbulb... I've used 8W speaker.
@@ElectricalPro it is 1.1V RMS into 4Ohms without (audible) distortion on a 12V/5A supply. So this is 1.1V² / 4Ohms = 0.3025W. Not more, not less. Sorry bro, but you wont get more than 500mW with heavy distortion. Maybe If you use a 24V supply but I guess that will blow the FET...
@@ElectricalPro btw.: Your heatsink is waaaaayyyyy too small. I used an aluminum block from an old PC supply and I can fry eggs on it, haha
Can I use a 16v transformer.