900W H-class PA Amp with Limiter - Page 2 - diyAudio
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Old 2nd March 2010, 07:31 PM   #11
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Originally Posted by wg_ski View Post
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.
Commutating diodes are SFA1603 TO-220 without heatsink, not cold but no need extra heatsink, maybie small TO-220 heatsink.
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Old 2nd March 2010, 07:36 PM   #12
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Originally Posted by event horizon View Post
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
I will post schematics. I dont espect any interested about that kind of amplifier in DIY.
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Old 2nd March 2010, 07:41 PM   #13
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Originally Posted by apexaudio View Post
I will post schematics. I dont espect any interested about that kind of amplifier in DIY.
I'm not sure why not? I bought a Mackie M3000 to drive some bass speakers, that's a 3 stage class H i believe. When the warranty runs out it'll get rebuilt so it uses big heatsinks & no cooling fans

You really don't need anything super quality when used at less than 100Hz in reality, 0.1% distortion should be more than adequate
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Old 2nd March 2010, 07:56 PM   #14
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Originally Posted by apexaudio View Post
I will post schematics. I dont espect any interested about that kind of amplifier in DIY.
actually, i do. i love high power amps, repair almost only pa stuff or heavy hifi and love to learn more.
reading and understandig schematics is a great way of practical learning

could you post an etch-able pcb layout too?

is it really 900W @ 8? i'd guess at 4 ohms or less with only 4 pairs of 1943/5200..

Last edited by powerflux; 2nd March 2010 at 08:00 PM.
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Old 2nd March 2010, 08:16 PM   #15
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Originally Posted by powerflux View Post
actually, i do. i love high power amps, repair almost only pa stuff or heavy hifi and love to learn more.
reading and understandig schematics is a great way of practical learning

could you post an etch-able pcb layout too?

is it really 900W @ 8? i'd guess at 4 ohms or less with only 4 pairs of 1943/5200..
Power suply 0,+/-60V,+/-120V. THD 0,03% 20-20000Hz on 900W 4 ohms. All new brand amplifier use 4 pairs of 1943/5200 evan for 1900W 2 ohms in their specification. I dont want to go tnat much.
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Old 2nd March 2010, 08:23 PM   #16
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My hard drive was death few years ago with all my schematcs. I have no backup, now I must redraw my old schematics. I share all my old schematics, becouse I dont use them in my new products.
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Old 2nd March 2010, 08:54 PM   #17
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This is 750W version with single step mosfet IRFZ44. Version is without limiter and balanced input.
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File Type: jpg APEXaudio H750.JPG (297.3 KB, 9016 views)

Last edited by apexaudio; 2nd March 2010 at 08:56 PM.
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Old 2nd March 2010, 11:30 PM   #18
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count me in I am also interested in building the old Apex 900W class H PA amp. cheers
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Old 3rd March 2010, 02:54 AM   #19
khalsa is offline khalsa  India
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Hi Apexaudio plz send me copy 900w h class circuit daigram and pcb layout i want build this amp thanks khalsaaudiocenter@yhoo.com
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Old 6th March 2010, 01:38 PM   #20
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H class amplifier output stage, can be used with many VAS.
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