hi apexaudio
greetings cool pcb would be a great diy project for h class diyers
keep up the goodwork
thanking you
andrew lebon
greetings cool pcb would be a great diy project for h class diyers
keep up the goodwork
thanking you
andrew lebon
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!!!
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.
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.
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..
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.
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.
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.
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 😀Do anyone want to DIY something like that?
I for one am interested & thanks for sharing if you do 😉
Commutating diodes are SFA1603 TO-220 without heatsink, not cold but no need extra heatsink, maybie small TO-220 heatsink.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.
I will post schematics. I dont espect any interested about that kind of amplifier in DIY.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'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 😉I will post schematics. I dont espect any interested about that kind of amplifier in DIY.
You really don't need anything super quality when used at less than 100Hz in reality, 0.1% distortion should be more than adequate 🙂
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..
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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.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..
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.
This is 750W version with single step mosfet IRFZ44. Version is without limiter and balanced input.
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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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