900W H-class PA Amp with Limiter

apexaudio · 2nd March 2010, 12:34 PM

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

Quote:

Originally Posted by apexaudio

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

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

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

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

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

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Nakamichi PA-7 & PA-5 Bias Setting?	sourceoneaudio	Solid State	6	8th March 2012 12:37 PM
900w amp module for sale	nigelwright7557	Swap Meet	0	9th July 2009 11:05 PM
About a very very simple class D PA amp	gaetan8888	Class D	8	13th March 2009 02:21 PM
Class-d for a 1kw PA amp	MikeHunt79	Class D	4	30th December 2007 06:19 PM
200w Amp + 900w Sub = explosion? 56k Warning	Daemonicus	Subwoofers	2	31st May 2006 04:30 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

2nd March 2010, 12:51 PM	#2
andrewlebon diyAudio Member Join Date: Feb 2008	hi apexaudio greetings cool pcb would be a great diy project for h class diyers keep up the goodwork thanking you andrew lebon

2nd March 2010, 12:59 PM	#3
apexaudio diyAudio Member Join Date: Feb 2010 Location: Serbia	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.

2nd March 2010, 01:28 PM	#5
apexaudio diyAudio Member Join Date: Feb 2010 Location: Serbia	This is 10years old schematics. Can be upgrade with new OP amp.

2nd March 2010, 04:32 PM	#8
apexaudio diyAudio Member Join Date: Feb 2010 Location: Serbia	I used TL072 on some PCB, at the end this is PA amplifier, work with 18inch subwoofer.

2nd March 2010, 06:36 PM	#9
wg_ski diyAudio Member Join Date: Oct 2007	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.