Ultra Simple Class D

[nrg2009]

very interesting.. I'd like to build one.

 

[irvynejay]

Norazmi thanx i did use 22uh 47 turns with the red core 1uf filter still have this problem coil heats up ill post my ee & ei ferrite cores smaller than ei33 maybe you can help me calculate

 

[norazmi]

use the core that i mark it with red circle, wind coil about 14-15 laps@turn. min awg 18. I`ll post mine too i made it from EI flyback trafo and it work great high volume only warming.

An externally hosted image should be here but it was not working when we last tested it.

 

[norazmi]

irvy, u have many ferrite core lol 😀 . what ur going to do? apply them into class D?

 

[nigelwright7557]

Norazmi thanx i did use 22uh 47 turns with the red core 1uf filter still have this problem coil heats up ill post my ee & ei ferrite cores smaller than ei33 maybe you can help me calculate

I use a t106-2 red core with around 30 turns and it barely gets warm.

 

[irvynejay]

hehehe i want to experiment the core every core have different response red core good detail audio,green good for low ,

what about this one gap is bigger than the other one

 

[norazmi]

ohh, yep, i feel different too, iron core and ferrite core have different sound and i`m prefer more to ferrite actually because can get more sound details.

 

[irvynejay]

Do i have to use bobbin for it before winding ??

 

[norazmi]

Yes Irvy use bobbin, Its a must 😀

 

[norazmi]

Irvy, if you can find RX5 hes from philippines too, hes good knowledge too about class D amp, maybe u can communicate with him better way. 😀

 

[norazmi]

hehehe i want to experiment the core every core have different response red core good detail audio,green good for low ,

what about this one gap is bigger than the other one

This on is ok too.

 

[redjr]

You're apparently linking to an attachment on another forum that needs registration to view attachments. Unfortunately, that forum strongly discourages such registrations:

Page Title

Yea, I found their restrictions a little odd for a DIY website too. But it's a free world. I didn't register.

 

[akraj]

Hi norazmi:

could you please share the schematic? I would like to make one as my first class D amp.

Thanks in advance

 

[norazmi]

yes i`ll provide no worry

 

[norazmi]

This is original schema, credit goes to the owner ejtagle from forosdeelectronica, as u wish u can always make your own design for the pcb, in class D make it as compact as possible, note that this module stable within maximum voltage is +/- 50vdc and do not go more than that voltage unless u`re experience in class D for component adjustment. bd139 and bd140 will provide heat, if more than its maximum voltage it might be burn. so please follow the maximum voltage with the component listed on schematic.

p/s - see attachment. original compress as .rar and i rename it to .zip, you can rename it back to .rar

best regards,
Azmi

 

[irvynejay]

pwm with EE core

update outputs are warm coil not heating up good result loud and clear output filters used 2 uf idle current 8mv dc

 

[akraj]

update outputs are warm coil not heating up good result loud and clear output filters used 2 uf idle current 8mv dc

Hi irvynejay:

What is the supply voltage? and are you using same PCB or modified by your own?

 

[irvynejay]

50volts dc ,,nope pcb is not modified

 

[CPX]

How is that schematic class D norazmi ??I see no output inductor and capacitor and to use tl072 for class D is a no go in my opinion.I do not understand how it could work.

 

[fireworks]

It says on the schematics that the amps needs to be connected to the speakers using an inductor which is not drawn on the schematics !