gainclone problems (dc offset, no sound)

damitamit · 5th September 2003, 07:31 PM

Hi,

are there common causes of dc offset?

my gainclone was working fine this morning, <10mV dc offset on both channels (with a 10ohm resistor across the terminals)

been playing with it, added a led from the power of one channel and paralleled a 100nF capacitor with the resistor from star ground to case.

now that channel has no sound, and 198mV dc offset. taken the led of and checked connections but still the same.

Cant seem to find anything. it seems exactly same as the working channel.

so i was wondering do u guys know any common causes of dc offset like that?

thanks
Amit

damitamit · 5th September 2003, 10:45 PM

forget all wat i said.

stupid me didnt check the umbilical cord from the psu to the amp. loose wires in there. the one channel wasnt gettin any power!

better din plugs/cable/soldering me thinks...

GrahamnDodder · 6th September 2003, 04:11 AM

Don't feel bad. Not the first time THAT's happened.

If memory serves, was it Nuuk who had this same experience? Could be wrong, but it was someone who had done a GC website.

GnD

rdunnit · 6th September 2003, 05:24 AM

I wouldn't worry too much about making mistakes. Mistakes are what have created some of the best things in life. Plus it takes a person of strong character to admit making a mistake. I find that if I get discouraged when trying to troubleshoot some of my handywork, I just take a break from doing what I was doing.
It amazes me at some of the dumb things that I have done and how I could have overlooked the simplest things. But I feel that mistakes are what make us better at whatever we may chose to do in life. Keep your head up and keep gainclonin' man.

5th September 2003, 07:31 PM	#1
damitamit diyAudio Member Join Date: Apr 2003 Location: London, UK	gainclone problems (dc offset, no sound) Hi, are there common causes of dc offset? my gainclone was working fine this morning, <10mV dc offset on both channels (with a 10ohm resistor across the terminals) been playing with it, added a led from the power of one channel and paralleled a 100nF capacitor with the resistor from star ground to case. now that channel has no sound, and 198mV dc offset. taken the led of and checked connections but still the same. Cant seem to find anything. it seems exactly same as the working channel. so i was wondering do u guys know any common causes of dc offset like that? thanks Amit

6th September 2003, 04:11 AM	#3
GrahamnDodder diyAudio Member Join Date: Jun 2003 Location: Near Baltimore, MD	Don't feel bad. Not the first time THAT's happened. If memory serves, was it Nuuk who had this same experience? Could be wrong, but it was someone who had done a GC website. GnD __________________ I had the right to remain silent. I just didn't have the ability. (Comedian Ron White)

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5th September 2003, 10:45 PM	#2
damitamit diyAudio Member Join Date: Apr 2003 Location: London, UK	forget all wat i said. stupid me didnt check the umbilical cord from the psu to the amp. loose wires in there. the one channel wasnt gettin any power! better din plugs/cable/soldering me thinks...

6th September 2003, 05:24 AM	#4
rdunnit diyAudio Member Join Date: Jan 2003 Location: Wichita, Kansas	I wouldn't worry too much about making mistakes. Mistakes are what have created some of the best things in life. Plus it takes a person of strong character to admit making a mistake. I find that if I get discouraged when trying to troubleshoot some of my handywork, I just take a break from doing what I was doing. It amazes me at some of the dumb things that I have done and how I could have overlooked the simplest things. But I feel that mistakes are what make us better at whatever we may chose to do in life. Keep your head up and keep gainclonin' man.

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