100W Class-D

Sierra

Sierra

Valve Lover!
a 100W class-D amp

No schematic was found

Only these :(
 

Attachments

  • 100wdamp2.jpg
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  • 100wdamp.jpg
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M

Malmir

Member
Sierra said:
a 100W class-D amp

No schematic was found

Only these :(
Click to expand...

As far as have been told Class D is the easiest way of PWM amplifing. This is a analog voltage level changer amp to drive the fets and not a Class D. Some reverse engineering is Done. Look at the PDF.
 

Attachments

  • SCHEMATIC1 _ 100w D Amp.pdf
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Sierra

Sierra

Valve Lover!
Correct

I think you are right.


However, thats a simple design of amplifier.

Have you developed any Class-D Amplifiers?

May be you want to show some pictures?
 
M

Malmir

Member
My first was the simple thing from the Dutch Elektor.
Think is simply was called PDM amplifier. PDM = Pulse Dauer Modulationen = PWM.
Pictures no, at least no jet :).
 
F

FELIBAR12

New member
Malmir said:
As far as have been told Class D is the easiest way of PWM amplifing. This is a analog voltage level changer amp to drive the fets and not a Class D. Some reverse engineering is Done. Look at the PDF.
Click to expand...

Mosfets,inverted!!!
correct form:source's to +/-rails
 
M

Malmir

Member
I have seen that :). But i don't have schematic tool at home, but at work, thus i can't change before tuesday or wednesday.

Problem is i did not remember what was Source and what was Drain at the symbol :-(. I always forget.
 
M

Malmir

Member
In english please :) ? But i guess Youask if it is not an class D and NO it is not.

Felibar. It looks to much similar to be a coincident :).
 
A

Aucosticraft

New member
To my kowledge pin 2 and 3 needs to be interchanged. As the ic LM393 forms a part of oscillator. And to initiate Oscillations Positive feedback is required. correct me if I am wrong.
 
M

Malmir

Member
Do you think of the pdf file ? if pin 2 and 3 are interconnected You would have only noice voltage at output ? It's connected as an amp not oscil.
 
A

Aucosticraft

New member
MalMir, I am not a pro person. All I know that for oscillations to start it needs positive feedback. to check if my basic assumption is correct. I checked with a circuit of one thats in market and so it must be working. I refered to other subwoofer amplifier given here. cause I am not vry sure how the design is going to work I had said correct me . Also if any of you have spice model for LM 393 I would like to try using proteus.
 
A

Aucosticraft

New member
Well here is a circuit diaram of the rectified ckt. I have simulated it using Proteus ISIS.
 

Attachments

  • 100W PCB.pdf
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H

hilli_billi

New member
Hi,
I think #1t IS class-d. The power fets are an N-type and one P-type. Malmirs schematic is ok. The 35µH coil L1 and C8 are the output filter.
C13, R3, R5 is the feedback to the comparator.
Seems to be an old schematic. Nowadays I would use something like IRS2092.
 
M

Malmir

Member
:-( :-( :-( uhu mama.....

Hilli-Billi. No i just saw i did a pcb reading flaw :-( ****, scheisse, merde.
Pin 2 and 3 ARE exchanged :-(

Sorry Aucostkraft, You might be right anyhow :-(
 
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