Cheap 2*15W Amp Class T




Introduction: Cheap 2*15W Amp Class T


First i'm french so sorry for my English ...

I would present you my little T-amp based on a MKll TA2024 board. This is perfect to recycle old speaker for example. 

If you don't know anything about the class T don't waste one more second of your life and => google : T-amp ( i'm joking )
If you want the synthese this class is the best : Sound quality / price / volume compromise, that we have now.

List of material :

-1 board MKll TA2024
- 1 x Switch type 202 
- 2 x RCA Panel mount
- 1 x Power supply 12V DC 2A 2.1mm
- 1 x spring terminal for speaker
- 1 x Panel mountDC 2.1mm 
- 1 Red LED + 1 resistor 680 ohms ( optional for Power On indicator  )

Board Characteristics:

10W @ 8Ω, 10% THD+N.
15W @ 4Ω, 10% THD+N.

88% @ 10W, 8Ω.
81% @ 15W, 4Ω.

Step 1: Electric Part

Wiring diagram ( So simple that even really beginners can do it ) :

This wiring diagram is in french so this is the translation :

Alim = power supply
vue dessus = top view
Led rouge = red DEL
HP= speaker
Bornier HP = Speaker connector
Boitier= case

Step 2: Made the Case

In my case, I chose only recycled materials. A square tubular steel and plywood.
But this step is optional because it's my case and i think you want your case with your design.

My piece of steel is 74*74mm and 150mm deep. My plywood is 15mm.

the first step is to cut the steel and polish it..

The second one is to made wooden facades.

Step 3: Final Assembly and Soldering

The last step is to solder all according to the wiring diagram and assemble your box around the components.

Step 4: Enjoy the Music

Put you music, and be proud of your first little amp which has cost you less than 20 dollars :)

and again sorry for my english ! 



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    24 Discussions

    S'il vous plaît ne vous excusez pas pour votre anglais! Votre anglais est merveilleux. Juste nous pardonner pour notre très mauvais français.

    1 reply

    votre français est parfait ! Aucune faute, mieux que pas mal de français :)

    10% is the high limit for good listening, it's why it's the max output power.

    Great project and your English is much better than my French, so don't apologize.


    4 years ago

    Great Instructable! Can you upload a picture of the connections side of the box?

    3 replies

    Sorry for my poor skills in english but i'm not sure to understand your question in the right way
    you mean that you want to see external connexions, or internal wiring ?

    PS : thank you for the compliments

    I wanted to see the external connections. looks like you added a few pics, thank you. It looks great! Your project is definitely going on the wishlist in my brain.

    Il voudrait que vous postiez une image de l'arrière de l'ampli pour comprendre comment connecter tous les fils.

    Cela dit, vous pouvez faire deux images : l'une de l'arrière à l'extérieur, l'autre à l'intérieur.

    Nice project! Just to make sure people understand, I think the word "weld" in part 3/4 should be "solder". Welding is used to join pieces of metal together. Again, neat project. I like the parts you used for the box.

    1 reply

    thank you, and thank you for the correction of errors, I edited it.

    Salut. ton montage diode est en parallèle? pk pas la mettre en serie. car la je vois que la diode s allume dès que tu branches ...

    1 reply

    oui la diode est en parallèle, entre le 0V et le 12V de la carte ( après le switch ). Elle s'allume donc pas quand tu branche l'alimentation au réseau, mais quand l'ampli est allumé et s'éteint avec le switch en même temps que la carte. ( voir la video à 45s )

    La mettre en série causerait une chute de tension, et la carte ne serait plus alimenter en 12V.

    De plus dans une LED, ont doit fixer le courant ( ici environ 15mA tension de diode 1.6V d'ou la résistance de 680 ohms ), afin de fixer la luminosité.

    the heatsink is useless. It's one the the strengh, of the class-T.
    The efficiency is so good that thermal lost is pretty small.

    For exemple here, with 2*15W, the efficiency is 81%. The thermal lost is only 7w.

    Qui ressemble beaucoup! Essayez d'utiliser la première image de la quatrième étape que votre image principale de projet pour démontrer précisément comment le dispositif doit être utilisé. (S'il vous plaît excuser mon français, j'ai utilisé Google Translate.)