Ultra Simple Class D

[norazmi]

yes, it will work with proper design, sending u an email now.

 

[Deleted member 148505]

yes, it will work with proper design, sending u an email now.

Hi Azmi,

Im planning to put NE555 for the delay and an optocoupler for shorting the U1B output to ground. I also want to use LM311 for the comparator because I already used it in one of my prototype amps and achieved good results. But it will consume too much pcb space.

Did you experience good results with small signal transistor (eg. 2n5401) for current sensing trigger? If it is good, and doesn't have false trigger problems I think I will use it instead of LM311

Thanks

 

[norazmi]

idk, but using transistor is not good, sometimes your power transistor safe and some might not, and without delay is more worst happens. better you go with ne555 and LM311, so far it did good job with ucd amp that i already test before, yea little more space it not a problem .

 

[Deleted member 148505]

Thanks, I just created a daughter board that can be attached on top.
The protection circuit is already tested in my other class d amp.

Here's the preview

 

[norazmi]

good pcb, but the protection circuit need to be test

 

[Tekko]

Another way to accomplish a super simple class d amp if lots of power is not the goal is to use mosfet gate drivers as output stages. Though with IXDD430 and BTL mode around 100 watts is possible into 4 ohms as these gate drivers can take up to 40V wheres the others are limited to max 18-20V.

Heres a BTL UcD i prototyped using UC3710's as output stages:

 

[Deleted member 148505]

good pcb, but the protection circuit need to be test

Hi no need to test the protection circuit, as I said before the protection works flawlessly on my other class d that I've created.

 

[norazmi]

thats working irs1500D o4 irs3000D from detex audio which this circuit already meet the requirement for the protection, but we are talking about this cheap class D and let see if it will working same way.

 

[stewin]

hi all you can use manojs protection which is good and working it is discreet and uses 555timer to shutdown ir2110 but in this case it can be modified to fit this amp.

 

[stewin]

hi all i made the few modifications .now it is better and can run with 2n5401 and 2n5551 as drivers.

 

[norazmi]

nice stewin, make it double sided will be smaller

 

[stewin]

thanks norazmi i will try double sided again. by the way is the modification o.k.?

 

[norazmi]

you want me simulate it with ltspice?

 

[stewin]

you want me simulate it with ltspice?

thanking you in advance.

 

[aron6]

Hi people!
Amazing amp project!
I was wondering if this could be used as a guitar power amp. I've already made a tube preamp for the warm sound, but I want to make a class D power stage for it. Could this be possible?

 

[stewin]

can you parallel output of this amp to use three pairs output? or has any one tried it with success?

 

[Tekko]

To be honest this class d really aint any simpler than my latest work, though performance might be better even though i generally dislike P channel fets because they never match the N channel in on resistance and current rating.

 

[stewin]

i very much agree with you p channel is a hustle but i am taking the cost of ic ir2110 into consideration i hope you design was a discreet one.
>>>> i wanted to make the amp more stable by paralleling the outputs.

 

[Deleted member 148505]

I'm currently creating a pcb layout for this, all through hole and easily obtainable parts.
I added low side current sensing and speaker protect in one board. Also added parallel diode/gate resistor to match P and N channel gate charging.

 

[stewin]

did you parallel outputs? please post your projects.