GC very low DC offset

matjans · 21st September 2003, 05:01 PM

After finishing building my gainclone I found that the DC offset on the speaker terminals is about 1 mv

. 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, 02:18 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, 04:09 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, 04:48 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, 05:02 PM

Ok back to the question. Do I just let it hang

or does it need to be tied somewhere

roncla · 22nd September 2003, 08:38 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, 08:41 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, 11:24 PM

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

21st September 2003, 05:01 PM	#1
matjans diyAudio Member Join Date: Aug 2003 Location: Utrecht, NL	GC very low DC offset After finishing building my gainclone I found that the DC offset on the speaker terminals is about 1 mv . 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.

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22nd September 2003, 02:18 AM	#2
roncla diyAudio Member Join Date: Aug 2003 Location: texas	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

22nd September 2003, 04:09 PM	#3
king30 diyAudio Member Join Date: Sep 2002 Location: Blue Bell, Pa	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?

22nd September 2003, 04:48 PM	#4
JCoffey diyAudio Member Join Date: May 2003 Location: Atlanta, GA	Hehe, you said 3rd leg............. Sorry, I'm in a wierd mood today, and i couldnt pass that one up....

22nd September 2003, 05:02 PM	#5
king30 diyAudio Member Join Date: Sep 2002 Location: Blue Bell, Pa	Ok back to the question. Do I just let it hang or does it need to be tied somewhere

22nd September 2003, 08:38 PM	#6
roncla diyAudio Member Join Date: Aug 2003 Location: texas	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

22nd September 2003, 08:41 PM	#7
roncla diyAudio Member Join Date: Aug 2003 Location: texas	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

22nd September 2003, 11:24 PM	#8
king30 diyAudio Member Join Date: Sep 2002 Location: Blue Bell, Pa	ron, Thanks. That's exactly what I needed.

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