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Old 10th August 2002, 10:49 PM   #1
skaara is offline skaara  Slovenia
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Default 1.2kw amp schematic to check

Could somebody who knows how amps work check this schematic, because author of that amp may put a little error(s) in it (cuz hes selling that amp too), and thing wont work.. Thank u
This one is for 800w, for 1.2kw 2 output transistors must be added on each side and voltage rised from +-95v to +-110v..
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File Type: zip schematic.zip (90.1 KB, 1694 views)
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Old 11th August 2002, 09:10 AM   #2
skaara is offline skaara  Slovenia
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And if somebody founds a mistake please post it here..
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Old 11th August 2002, 09:19 AM   #3
e96mlo is offline e96mlo  Sweden
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Where did you find it?

/Marcus
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Old 11th August 2002, 09:47 AM   #4
skaara is offline skaara  Slovenia
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I found it in some sloveniam magazine, and I dont know if the schematic is without mistakes, I already have pcbs at home, but I need to know that the schematic is right that I will check the whole thing before I plug it in..
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Old 12th August 2002, 12:15 AM   #5
djk is offline djk
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QSC, a well know manufacturer of commercial amplifiers in the USA, uses eight pair of MJ15024/25 (sixteen devices per channel) for +/- 95V supplies. If you intend to raise the rail voltage to +/- 110V you must use MJ21193/94, they have twice the SOA at 100V. The use of IRF 640/9640 as driver transistors is not to be recommended, they are very hard to stabilize over temperature. I would not build this project.
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Old 12th August 2002, 12:09 PM   #6
skaara is offline skaara  Slovenia
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Thank you for your answer. But is the schematic allright from aspect of working?
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Old 12th August 2002, 12:15 PM   #7
skaara is offline skaara  Slovenia
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Which amp would you recommend for me to build which has the same (or more) power like this?
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Old 17th August 2002, 06:58 PM   #8
skaara is offline skaara  Slovenia
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Can someone please just tell me what class is that amp, B or AB, because the bias is only few mA (writed in the article of that amp) and the fet powers the music until the voltage across R105 and R106 is big enough, then the power is accompanied by output transistors.. Schematic is in my first post in this thread. Please have a look.
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Old 17th August 2002, 08:48 PM   #9
jleaman is offline jleaman  Belgium
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id build the av800 or the 1kwatt one from e-holton there cheap to buy from him ( the boards) and he has a awsome layout and building instructions..

Jason
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Old 17th August 2002, 09:54 PM   #10
skaara is offline skaara  Slovenia
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Ill consider that, but i have this one assembled, just need the toroid and the chasis, and id like to know in which class that operates, B or AB..
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