Sunday, March 25, 2018

DIY 500W Class-D TL494 Switching Amplifier

Power Amplifier Class D using TL494 IRF N Channel mosfet
In this project, I will share about class-d power amplifier using TL494 IC for PWM, and use N-Channel MOSFET transistor as the final amplifier. This circuit is not so complicated and cheap to make practice making power amplifier class-d. This power amplifier circuit can be supplied with 30V to 100V DC asymmetric power supply using 8VDC bias voltage up to 12VDC. For the output power of this amplifier can generate power up to 500Watt, pretty good is not it? to make this power amplifier please see the circuit schematic of TL494 Power Amplifier below along with PCB Layout design that you can download in the form of .PDF format.
TL494 Power Amplifier Class-D SMPS Audio PWM to Audio
Part List:
C2, C3=1N
C4, C6=10uF/50V
C7, C9, C10=220uF-1000uF/100V
C8= 100N/400V
C11, C12= 1uF - 4u7F / 400V
Q1= MJE350
Q2, Q3=MJE340
Q4, Q5= IRF540, IRF460, IRF250, IRF 4227 N-Channel Mosfet
U1= TL494, TL494CN
L1= 22uH - 35uH
J1= Audio input
J2= Bias Voltage 8-12V
J3= +V 30- 100V DC
J4= Speaker Output

Below the PCB Layout Design for Power Amplifier Class-D TL494, You can download and print the PDF file:
PCB Power Amplifier TL494 Class-D Amplifier PWM SMPS Audio
Download PCB.PDF: PCB Power Amplifier TL494

DIY Power Amplifier class-d high power amplifier
In the picture above is when PCB I etching using Ferichloride and shake it into the container. For more details, I will update the video complete making this class-d power amplifier using TL494.

Electronic Circuit is a good site for hobbyist also who would like to try DIY because it shared good circuits. If you have a personalized circuit requirement you may feel free to request it through the comment box or contact me.


me too sir. cause its powerfull and hugh efficience and cold final tr

helo friend
can this be able to drive two 12" 420w RMS sony xplod bass ans two 12" 100w RMS cone speaker.

This look amazing, what is the THD for this amp?

Do not be deceive it does not work and is a scam. Please do class AB amplifier and live the scam yoy.wart your fund. Try Nelson pass circuit it has class A and class Ab they all work fine and the sound quality is of it best and you will be amazed.

If you prefer class d amplifier don't try this because is wast of funds.😂😂😂😂😂😲😲😱😱😱

This is my email address I know he will insults me for saying it does not work. Some has unstable oscillator and giving it high watts. My Nelson pass class AB mosfets sound better and quality than all the above class D circuit.😂😆😆😆😆😆

I do used Nelson pass misfits circuit in my active line array and far better than his 😂😂😂😂😂😂😂.

hi what is the minimum impedance that this amplifier supports?

Scam what, its working, see video.

it less power to drive 12inch subwoofer in two

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jika anda yang punya desain silahkan hubungi kontak us.

amigo aqui do brazil voce pode me tira,uma duvida pq no transistor em um dos fet nao chega o sinal pwm base de Q1 NAO TEM SINAL nao sai audio

hi greetings excellent your amplifier ... how to build the coil L1 ??? ..... if I wanted to increase power, alone would have to increase voltage and change mosfet ???

buenas noches, hay una diferencia entre el PCB y el diagrama. en el PCB la pista que sale del colector de Q2 (MJE340) está unida a la pista de su base, y en el diagrama está separada. En el circuito del video está como debe ser, o sea, corregido. yo monté el circuito pero no me funciona, aparece una señal muy débil, probablemente haya alguna otra diferencia, o conecté algo mal. si alguien me puede ayudar, estoy agradecido. muchas gracias

aprecien bien el vídeo muestra dos circuito diferente el primero aparecen como dice plano mj340 y mj350 y cuando van a probar circuito ya aparece un transistor mas grande donde vas un mj340 para mi es fraude eso es como ofender a tu seguidores

follow the pcb layout, it works

bueno días amigo si funcionas pero mal yo con modificaciones le estoy sacando 50 vatio pero me suena ronco y se calienta los mofe si me quiere ayudar aqui esta mi correo gracia amigo

tenho nucleo de 35mm AWG17!!! quantos giros???

ola amigo se voce presta atençao a um curto na pcb entre base e coletor de mj340 o Q2 E SO CORTA COM O ESTILETE POIS NO VIDEO ELE CORTOU O CURTO

separa na pcb com um bisturi , no video que ele fez no tem curto

tienes um curto em Q2 entre B e c , corta com um bisturi

funciona!!! mas tengo de por um preamplificador

Dear Wahyu Eko Romadhon,
Can I use air coil inductor for L1 ? So, would you mind to tell me about diameter wire ?
Best regards,

good ono does not solve anything friend

Hello ramdhan,how are u my old friend, bro I assembled this CLASS D 500WATTS AMPLIFIER, super working, this circuit is 100/ working, bro u r great bro ,bro first I try 4k5 ,but some problems ,then I stop ,now 500 amplifier is working, next project is 4k5 ,bro if u want this amplifier videos I will give to u ,I test this amplifier on 105/10A power supply, great,bro great bro pls give ur any contact number, my number is +918921058775 what's up ,thanks bro for this amplifier , durga sounds ,

BRI lf filter Wire gauge and turns pls tell me bro

Hola Wahyu eko Romadhon este amplificador da los 500 vatios En 8 ohmios a 4 ohmios Gracias amigo

Om bikin l1 nya imana om? Beraa lilit dan berapa diameter kaeat sama kern nya..

Pcb design 99% correct and secondary voltage require maximum 7.5v
Any boady can contact me on youtube. Pranatosh Tech channel. I will upload working pcb within 3 days.

Eai amigo guilherme tudo blz!?
Quero montar esse amp mas tenho pouco de receio, diz ai vc ja montou? Como foi tocou bem?

From where you ordered the inductor coil

Thanks pranatos what your youtube channel?

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Elo' Wahyu In your amplifier diagram there was no 32 mh? , only the 1 mh zobel output so how come in your pcb suddenly You put a 32 mh? so confusing

Já mandei vários email,e não tenho resposta. Porque?

roberto brito , tive muitos problemas para fazer lo tocar pois temm um curto na pcb foi dificil indentificar mas tem que seguir e o esquema e ver a pcb contra a luz

from what the material made is a core L1 ? maby from atx power suply or not ? whats a model of core L1 ?

Hello Rommadhon sir, I am upload this amp video. My channel name is Pranatosh Tech.

buenos dias estimados amigos, primero deceo darles las gracias por el buen aporte, el amplificador suena mejor de lo esperado, (nota) a los que lo estan armando por primera vez el proyecto quiero decirle que tengan muy en cuenta el diodo 3 debe ser un uf 4004 con un tiempo de reaccion inversa de 35 ns o mas, en vez del 1n4148 que aparece en el diagrama.

Hope u r doing good.
U told the power supply voltage range but didn't mention the ampere or current rating for power supply

Otimo Amplificador, acabei de montar e tocou sem problemas. fácil montagem, so necessita de um pré. obs, tem uma trilha em curto no transistor mje 350. fora isso, ta otimo

please sir tell me what is the number coil gauge please..and ferrite core size.

This circuit have feedback or not?

the idea sounds great, i like class d amplifier, and this one seems simple and portable, im building one, will give feedback when im done and tested it

Hola amigos una consulta por que L1 tiene dos valores 22 y 35 eso no entiendo
Espero sus repuestas
Saludos cordiales

Q pasa q el amigo q posteo esto no contesta

algo errado com o driver do Q5 ? parece faltar uma alimentação... hola les dejo este link
Funciona de maravillas muchas grcias
Wahyu 50 voltios de fuente y 7 voltios de bias luego lo llevare a 75 voltios de fuente
Muchas gecias

i'm approaching to build your amp, would you be so kind to share L1 specs? What type of core, type of wire, number of turns etc etc? Thanks

Core size,hight 1cm/width 3cm/

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Hay un error me parece calienta el mosfet lo arme pero está saturado y ronco si alguien me puede ayudar por favor mi correo es

Hay un error me parece calienta el mosfet lo arme pero está saturado y ronco si alguien me puede ayudar por favor mi correo es

this circuit is working fine, for irf540N maximum dc recommended is 50vdc, if you choose high rds on mosfet like irfp460, irfp240 , mosfet will host when passed 55vdc, i havent tried yet with 100vdc, this amp running fsoc = 100khz not really fast, more head despites will waste watts and efficiency not more than 80%. for low voltage 1rf540n is recommended, mosfet remain cool, i make 30uh with 1uf filter cap, i also havent tried to increase freq yet, but this amp some good is less component. the comparator should be change to have better performance too.

the inductor must be more than 100uh so it will stable. irfp460 no heat at all.

I have been build the circuit. Its work, its work, its work!!!!
Thanks a lot for share the information.

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Surely that this circuit works. It is very basic, and perfectly understandable, but is not a HQ amplifier for home audio.
In fact, the author does not say nothing about then distortion, inttermodulatio, EMF, damping factor and those all features that are so important when one want judge an amplifier performance.
Basically I can find useful this class D amplifier for using as a megaphone only for talking very loud in a wide open field, where the sound quality doesnt have any importance, butv the efficiency and energy saving matters...

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