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Old 15th May 2008, 06:59 AM   #1
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Default NEED HELP on DX prs -I

hi,

i need help to understand the problem arised recently. i just made DX-precision I, last time it was ok, when i reconstruct my circuit, now i can play on low voltage without any problem like 22-0-22, but then i apply 56v on it , it's showing some problem like every few seconds making loud sound "chuik, chuik, what can cause this problem? i checked all transistors.

thank you
michael
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Old 15th May 2008, 07:06 AM   #2
Nordic is offline Nordic  South Africa
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you didn't maybe leave the protection resistors in?
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Old 15th May 2008, 07:21 AM   #3
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hi, thanks,

pls, which protechtion resister r u refring?

thank you again.

michael
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Old 15th May 2008, 07:33 AM   #4
Nordic is offline Nordic  South Africa
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the resistors you install between PSU and amp during bias adjustment...
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Old 15th May 2008, 07:40 AM   #5
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they are fine. nothigs is there.
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Old 15th May 2008, 07:55 AM   #6
Nordic is offline Nordic  South Africa
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Next step is to check voltages...

Output side voltages
Regulated side voltages... measure from ground to zener/s.
voltages around other zeners...
output offset
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Old 15th May 2008, 08:11 AM   #7
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ok, just checked, + rail side zinar to gnd 0.04v, - rail zinar to gnd 0.20v, output to speaker 0.002v.
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Old 15th May 2008, 08:14 AM   #8
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sorry main voltage supply is 59.2 v

4.7v zinar to gnd voltage 0.44v, 12v zinar to gnd 0.08v
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Old 15th May 2008, 09:31 AM   #9
Nordic is offline Nordic  South Africa
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Something is wrong!

What voltages are you useing for the regulator's zeners?
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Old 15th May 2008, 09:42 AM   #10
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+ rail 2 zinars are 22v and 33v, 1 wats in series, same into - volt rail too. another zinar is 4.7v and 12v, one each, this are not in series.


i just connect as shown same as shmdt.

thanks for helping me.
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