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-   -   GC very low DC offset (http://www.diyaudio.com/forums/chip-amps/20559-gc-very-low-dc-offset.html)

matjans 21st September 2003 04:01 PM

GC very low DC offset
 
After finishing building my gainclone I found that the DC offset on the speaker terminals is about 1 mv :bigeyes:. I tested this with three different multimeters (I couldn't believe it, actually ).

Am I just lucky or does anybody else have the same experience?

It sounds pretty nice btw.

roncla 22nd September 2003 01:18 AM

Yep, on my config on the inverted GC i run a 500k multi turn pot from pin 7 to ground. After running for about 1 hr. i just tune the offset to 0.I have found it sometimes will drift to 1mv , but hay thats acceptable. LOL
ron

king30 22nd September 2003 03:09 PM

quick question on the pot hookup. The wiper gets hooked to pin seven, and another leg to ground. my pots have three legs. Where does the 3rd one get hooked to?

JCoffey 22nd September 2003 03:48 PM

Hehe, you said 3rd leg.............

Sorry, I'm in a wierd mood today, and i couldnt pass that one up....

king30 22nd September 2003 04:02 PM

Ok back to the question. Do I just let it hang ;) or does it need to be tied somewhere ;)

roncla 22nd September 2003 07:38 PM

Let it hang LOL!!!! No tie the 2 legs together then to ground.Let the amp come up to normal operating temp, i go about 1 hr. then adjust the pot to provide for 0 v offset.
ron

roncla 22nd September 2003 07:41 PM

Sorry if there was any confusion (i should read the question). The first leg of the pot goes to pin 7, the next 2 legs (middle one and the outer one) goes to ground.Let the amp run for around 1 hr to come up to full operating temp then adjust the offset to 0 mv.
ron

king30 22nd September 2003 10:24 PM

ron,
Thanks. That's exactly what I needed.


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