900W H-class PA Amp with Limiter

hi apexaudio
greetings thanks for reply looking forward to make this project
1 can diode rhrg 3040 be substitued with diode 30ETH06 FRO INTERNATIONAL
RECTIFER both diodes are hyper fast 30 amps 600 volts
2 will design pcb for step driver circuit
3 have 3 50 0 50 spare transformers so can i wire them up in series for
testing
4 supply condensers voltage rating should be 80 volts is it okay
5 can ac voltage be reduced to 40 0 40
6 with this supply can 2sc 5200 and 2sa1943 be used in output stage to keep cost down and they are easily available
thanking you
andrew lebon

For 3 step class H you need 6x35v ac maximum (I suggest 6x30v ac), and than you can use 2SA1943/2SC5200 (6 pairs minimum).
Regards
 
Hi Apexaudio
Greetings tlo72 step driver works well power supply and new DIY toroidal transformer for H900

thanking you
Andrew Lebon
 

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hi apexaudio
greetings thanks for the encouragement yes temprature is low
will check it on jbl 500 watt speaker for 4 to 5 hrs full volume then will i comment busy designing 3 step pcb
what software do you use to design pcb never used any pcb software till now
all hand drawn hope it works thanks apexaudio for sharing your wonderfull
schematics
thanking you
andrew lebon
 
hi apexaudio
greetings thanks for the encouragement yes temprature is low
will check it on jbl 500 watt speaker for 4 to 5 hrs full volume then will i comment busy designing 3 step pcb
what software do you use to design pcb never used any pcb software till now
all hand drawn hope it works thanks apexaudio for sharing your wonderfull
schematics
thanking you
andrew lebon

Use ExpressPCB it's for beginner
ExpressPCB - Free PCB layout and schematic software
Regards
 
Hello sir APEX,

I'm one follower of your thread.
I just want to show a schematic we back 80's.
This sound ok with 38 0 38 ac.

Wish i could supply it on higher voltage like 70 0 70 ac transf.
Somebody could help me to revise this schematic.

thanks in advance.
regards,
Ronald
 

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Witch of these njw1302/3281, njw0302/0281, mjl4302/4281, is better for the 1200w version (6 in pararel )
I have a local supplyer who sels them at 1 Euro per piece.



Sorry for my english !


Its clear to me, that price for NONE genuine parts, be carefull.

This unit priced at 6.5US$ each, So Be aware!

Show Some clear pictures, Or buy one and crash it, and see the size of the silicon chip inside it, post it here, I can tell you. :D


Thanks