SFX Class D subwoofer amplifier modification

sagarverma · 16th June 2006, 05:29 PM

I have been sifting thru this forum for a simple Class D amplifierwhen i stumbled upon the fact that this
Class D amplifier has been constructed by SFX for his sub.
what i want is to make it a dual supply version,is it possible?

Tekko · 16th June 2006, 06:48 PM

Why not keep it as is ?

sagarverma · 17th June 2006, 04:25 AM

actually i want to use that amp in my car.i have a smps in the car giving output as + - V. I will be replacing TDA729x amps in the car bec they are big(mostly bec of heatsink).
so i want the amp to be able to hook up directly to the smps without unnecessarily straining it
moreover,isnt a dual supply version better than the single supply one?
can anyone suggest the requisite changes?

sagarverma · 17th June 2006, 05:22 PM

at least..can anyone check the schematic given at the website and tell wether its correct or not?

Genomerics · 17th June 2006, 07:18 PM

It's not Buy One Get One Free.

What would you do?

DNA

sagarverma · 17th June 2006, 07:55 PM

i want to make a class d amp,dual supply one.
this one is too simple and so attracts me.
the other one is complex but promises good quality.
i will finish this one and come to that pretty soon(provided this one is correct)
can anyone check it for errors?

sagarverma · 20th June 2006, 04:12 PM

isn't there even a single person who can check this scheme for errors??

Tekko · 20th June 2006, 04:37 PM

You could check this:

Its my contribution on making the TB a split supply version, but it may not work, the pwm works, thats tested in simulator, but the power part i dunno.

sagarverma · 20th June 2006, 05:10 PM

hi Tekko,
thank u for your reply.

BTW,is the single supply schematic correct....if i go with that only then is that safe....?
power part....hw can that be corrected(tested) in your version?

Tekko · 20th June 2006, 05:17 PM

I have simulated the pulsewith modulator, tho the triangle was more of a sine it seemed to work.

But i´d still rdcommend you to build the thunderball after the original schem from the author. If you wanna build a split supply amp, try Titanchen´s circuit.

16th June 2006, 05:29 PM	#1
sagarverma diyAudio Member Join Date: Feb 2005 Location: NEW DELHI	SFX Class D subwoofer amplifier modification I have been sifting thru this forum for a simple Class D amplifierwhen i stumbled upon the fact that this Class D amplifier has been constructed by SFX for his sub. what i want is to make it a dual supply version,is it possible? __________________ Never Underestimate The Bandwidth of A Station Wagon Full Of Magnetic Tapes Hurtling Down The Highway...................Andrew S Tanenbaum

16th June 2006, 06:48 PM	#2
Tekko diyAudio Member Join Date: Jan 2005	Why not keep it as is ? __________________ The point of life is to build atleast one audio amplifier before you die.

17th June 2006, 04:25 AM	#3
sagarverma diyAudio Member Join Date: Feb 2005 Location: NEW DELHI	actually i want to use that amp in my car.i have a smps in the car giving output as + - V. I will be replacing TDA729x amps in the car bec they are big(mostly bec of heatsink). so i want the amp to be able to hook up directly to the smps without unnecessarily straining it moreover,isnt a dual supply version better than the single supply one? can anyone suggest the requisite changes? __________________ Never Underestimate The Bandwidth of A Station Wagon Full Of Magnetic Tapes Hurtling Down The Highway...................Andrew S Tanenbaum

17th June 2006, 05:22 PM	#4
sagarverma diyAudio Member Join Date: Feb 2005 Location: NEW DELHI	at least..can anyone check the schematic given at the website and tell wether its correct or not? __________________ Never Underestimate The Bandwidth of A Station Wagon Full Of Magnetic Tapes Hurtling Down The Highway...................Andrew S Tanenbaum

17th June 2006, 07:55 PM	#6
sagarverma diyAudio Member Join Date: Feb 2005 Location: NEW DELHI	i want to make a class d amp,dual supply one. this one is too simple and so attracts me. the other one is complex but promises good quality. i will finish this one and come to that pretty soon(provided this one is correct) can anyone check it for errors? __________________ Never Underestimate The Bandwidth of A Station Wagon Full Of Magnetic Tapes Hurtling Down The Highway...................Andrew S Tanenbaum


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17th June 2006, 07:18 PM	#5
Genomerics Account Disabled Join Date: Oct 2004	It's not Buy One Get One Free. What would you do? DNA

20th June 2006, 04:12 PM	#7
sagarverma diyAudio Member Join Date: Feb 2005 Location: NEW DELHI	isn't there even a single person who can check this scheme for errors?? __________________ Never Underestimate The Bandwidth of A Station Wagon Full Of Magnetic Tapes Hurtling Down The Highway...................Andrew S Tanenbaum

20th June 2006, 05:10 PM	#9
sagarverma diyAudio Member Join Date: Feb 2005 Location: NEW DELHI	hi Tekko, thank u for your reply. BTW,is the single supply schematic correct....if i go with that only then is that safe....? power part....hw can that be corrected(tested) in your version? __________________ Never Underestimate The Bandwidth of A Station Wagon Full Of Magnetic Tapes Hurtling Down The Highway...................Andrew S Tanenbaum

20th June 2006, 05:17 PM	#10
Tekko diyAudio Member Join Date: Jan 2005	I have simulated the pulsewith modulator, tho the triangle was more of a sine it seemed to work. But i´d still rdcommend you to build the thunderball after the original schem from the author. If you wanna build a split supply amp, try Titanchen´s circuit. __________________ The point of life is to build atleast one audio amplifier before you die.

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