NEED HELP on DX prs -I

space2000 · 15th May 2008, 06:59 AM

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

Nordic · 15th May 2008, 07:06 AM

you didn't maybe leave the protection resistors in?

space2000 · 15th May 2008, 07:21 AM

hi, thanks,

pls, which protechtion resister r u refring?

thank you again.

michael

Nordic · 15th May 2008, 07:33 AM

the resistors you install between PSU and amp during bias adjustment...

space2000 · 15th May 2008, 07:40 AM

they are fine. nothigs is there.

Nordic · 15th May 2008, 07:55 AM

Next step is to check voltages...

Output side voltages
Regulated side voltages... measure from ground to zener/s.
voltages around other zeners...
output offset

space2000 · 15th May 2008, 08:11 AM

ok, just checked, + rail side zinar to gnd 0.04v, - rail zinar to gnd 0.20v, output to speaker 0.002v.

space2000 · 15th May 2008, 08:14 AM

sorry main voltage supply is 59.2 v

4.7v zinar to gnd voltage 0.44v, 12v zinar to gnd 0.08v

Nordic · 15th May 2008, 09:31 AM

Something is wrong!

What voltages are you useing for the regulator's zeners?

space2000 · 15th May 2008, 09:42 AM

+ 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.

15th May 2008, 06:59 AM	#1
space2000 diyAudio Member Join Date: Mar 2008	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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15th May 2008, 07:06 AM	#2
Nordic diyAudio Member Join Date: Sep 2005	you didn't maybe leave the protection resistors in?

15th May 2008, 07:21 AM	#3
space2000 diyAudio Member Join Date: Mar 2008	hi, thanks, pls, which protechtion resister r u refring? thank you again. michael

15th May 2008, 07:33 AM	#4
Nordic diyAudio Member Join Date: Sep 2005	the resistors you install between PSU and amp during bias adjustment...

15th May 2008, 07:40 AM	#5
space2000 diyAudio Member Join Date: Mar 2008	they are fine. nothigs is there.

15th May 2008, 07:55 AM	#6
Nordic diyAudio Member Join Date: Sep 2005	Next step is to check voltages... Output side voltages Regulated side voltages... measure from ground to zener/s. voltages around other zeners... output offset

15th May 2008, 08:11 AM	#7
space2000 diyAudio Member Join Date: Mar 2008	ok, just checked, + rail side zinar to gnd 0.04v, - rail zinar to gnd 0.20v, output to speaker 0.002v.

15th May 2008, 08:14 AM	#8
space2000 diyAudio Member Join Date: Mar 2008	sorry main voltage supply is 59.2 v 4.7v zinar to gnd voltage 0.44v, 12v zinar to gnd 0.08v

15th May 2008, 09:31 AM	#9
Nordic diyAudio Member Join Date: Sep 2005	Something is wrong! What voltages are you useing for the regulator's zeners?

15th May 2008, 09:42 AM	#10
space2000 diyAudio Member Join Date: Mar 2008	+ 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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