DIY Good Class D amplifier

[Acca]

I dont have enough time.You can make it with Sprint Layout.

 

[0t0c0]

hi acca sorry for disturbing , but please do a pcb using the 14pin ir2110 .

I tried making one with IR2110, not sure if it's good but here it is...

 

[stewin]

thanks 0t0 , nice one .have you tested it? please post pcb files.

 

[Acca]

See picture for corrections:

 

[Acca]

For 30u coil you can use EE33 with 1mm gap,18 turns,2mm wire

 

[stewin]

thanks acca. i am redrawing it and will post details.

 

[0t0c0]

See picture for corrections:

Thanks for the corrections, how's this?

View attachment bottom.pdf
View attachment top.pdf

thanks 0t0 , nice one .have you tested it? please post pcb files.

I haven tested it yet, I was about to etch one but Acca posted some corrections so I'm redwaring it and waiting for feedback.

 

[Acca]

Not good.This two lines must go to source pin of fet,same as on my picture.

 

[stewin]

Not good.This two lines must go to source pin of fet,same as on my picture.

what is the advantage of using dual lines as you have drawn ?

 

[0t0c0]

Not good.This two lines must go to source pin of fet,same as on my picture.

Ok, I fixed it



View attachment top.pdf

View attachment bottom.pdf

 

[Acca]

@stewin
Current separation.
@0t0c0
This is better.

 

[0t0c0]

This is better.

Thanks a lot for the design corrections.
I have just a couple of questions before I build it, what FETs would you recommend for a Bridge @2ohms with a supply +/-40 (max +/-50V unloaded)
Would something like IRFP250N work good?

thanks in advance.

 

[Acca]

Fet with smallest Qg will be better,but if you don't have any this is ok.

 

[0t0c0]

Fet with smallest Qg will be better,but if you don't have any this is ok.

woow that was fast 🙂

I'll look for some other fets and post if I find anything.
I'll be building the amp tomorrow.

 

[Acca]

Yes,and fets will be fast too 😉
I'll wait for pics 😉
Use series limiting bulb with power transformer.

 

[0t0c0]

Yes,and fets will be fast too 😉
I'll wait for pics 😉
Use series limiting bulb with power transformer.

I'll probably order some IRFB4227 fets later, for now I'll do my testing with IRFP250N.
Pics to come tomorrow 🙂
Also I intend to power this (after testing with regular transformer of course) from a car SMPS.

Have you measured the efficiency of the amplifier?

p.s. sadly the store I order my components from is doing some kind of maintenance to their warehouse and I won't be able to order some of the component for another week 🙁.

 

[Acca]

Effidency is better than some class D amp's on this forum,because PWM goes from 0 to ~98%
It's better than self osc. amps.

 

[don2007ksa]

Hi Aleks,what will be the highest or maximum output(watt's) by using -/+ 90V approximately?I'll already try it on -/+56V it has a lot of power,just one more question it doesn't have a feedback will it run safely at full power,thank's.

 

[Acca]

Max output:
P=U^2/R
With +/-90V,RMS voltage will be 64V (idealy)
On real amp,this will cca. 60V (with 90V stable).
60*60=3600
3600/4ohm=900W
3600/8ohm=450W
Feedback isn't problem.
Just set potentiometer to 0V at output (50% duty cycle).Glue pot if wish,to prevent move from vibrations.0V at output will be very stable.
First try with lower voltages.

 

[don2007ksa]

Thank you so much Aleks,hope i can find a solution to the noisy output came from my speaker's,it's around 60 hertz something maybe from my power supply cause i'm using a linear one,hope to hear more from you.