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-   -   900W H-class PA Amp with Limiter (http://www.diyaudio.com/forums/solid-state/162408-900w-h-class-pa-amp-limiter.html)

apexaudio 2nd March 2010 12:34 PM

900W H-class PA Amp with Limiter
 
1 Attachment(s)
Do anyone want to DIY something like that?

andrewlebon 2nd March 2010 12:51 PM

hi apexaudio
greetings cool pcb would be a great diy project for h class diyers
keep up the goodwork
thanking you
andrew lebon

apexaudio 2nd March 2010 12:59 PM

On this PCB I use IRF540 in paralel for step higher voltage, and LDR for limiter. Output stage with 2SA1943/2SC5200. Step driver with IR2117 and NE5532 on balanced input stage.

sumaudioguy 2nd March 2010 01:13 PM

NJM2068 is better than NE5532 in every way!!!
 
Quote:

Originally Posted by apexaudio (Post 2104225)
On this PCB I use IRF540 in paralel for step higher voltage, and LDR for limiter. Output stage with 2SA1943/2SC5200. Step driver with IR2117 and NE5532 on balanced input stage.

NJM2068 is better than NE5532 in every way!!!

To everyone- please quit using this horrid sounding 30 year old op amp. The 2068 is better in every way, quieter, lower distortion, less offset and drift, larger output current, lower input bias, faster, and most important of all it sounds FAR better than any 5532 ever thought about.

apexaudio 2nd March 2010 01:28 PM

This is 10years old schematics. Can be upgrade with new OP amp.

wahab 2nd March 2010 03:23 PM

Quote:

Originally Posted by sumaudioguy (Post 2104238)
NJM2068 is better than NE5532 in every way!!!

To everyone- please quit using this horrid sounding 30 year old op amp. The 2068 is better in every way, quieter, lower distortion, less offset and drift, larger output current, lower input bias, faster, and most important of all it sounds FAR better than any 5532 ever thought about.

Beg to differ...
The old guy is faster than the japanese counterpart..
ALso, it has no more distorsion , and is as much quiete..

sumaudioguy 2nd March 2010 04:29 PM

Quote:

Originally Posted by wahab (Post 2104381)
Beg to differ...
The old guy is faster than the japanese counterpart..
ALso, it has no more distorsion , and is as much quiete..


I suggest you measure these two op amps in circuits as used and see the result.

apexaudio 2nd March 2010 04:32 PM

I used TL072 on some PCB, at the end this is PA amplifier, work with 18inch subwoofer.

wg_ski 2nd March 2010 06:36 PM

It doesn't look like your commutating diodes are on the heat sink.... Are you expecting them to run stone cold? I wouldn't. BTW - which ones are you using? Looks to me like a 2-lead TO-220.

BTW - for all the naysayers - there's nothing wrong with a 5532 in a PA AMP! I use OPA2604's but that's personal preference because I grew up on the LF353. Still doesn't pass the audiophile snob test.

event horizon 2nd March 2010 06:57 PM

Quote:

Originally Posted by apexaudio (Post 2104201)
Do anyone want to DIY something like that?

Well lets just say that seeing how it is built would be interesting :) I'm sure that a good few people could find use for a powerful & more efficient (than AB) amplifier :D

I for one am interested & thanks for sharing if you do ;)


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