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Old 20th November 2004, 04:36 PM   #1
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Default quiescent current different on both channels?

hi, have dual 0.22 ohm 5 watt emitter resisters when measuring voltage across outside legs on one dual i get about 8 to 10 mv. about 30 seconds after turning amp on but, across the other dual, i get between 18 to 20 mv. could it take more warm up time for one channels quiescent current to build and stabilize, than the other normally? or do i have a problem? i have no trim pots to adjust amp seems to sound fine. any help is greatly appreaciated, crippledchicken ps this in in an onkyo m-282 2 channel power amp.
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Old 20th November 2004, 05:02 PM   #2
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What do you mean by "other dual"? Same channel or other channel? Or are both duals in the same channel?

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Old 20th November 2004, 05:05 PM   #3
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it's for the othre channel i guess there's only two of them
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Old 20th November 2004, 05:18 PM   #4
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Default Re: quiescent current different on both channels?

Quote:
Originally posted by crippledchicken
hi, have dual 0.22 ohm 5 watt emitter resisters when measuring voltage across outside legs on one dual i get about 8 to 10 mv. about 30 seconds after turning amp on but, across the other dual, i get between 18 to 20 mv. could it take more warm up time for one channels quiescent current to build and stabilize, than the other normally? or do i have a problem? i have no trim pots to adjust amp seems to sound fine. any help is greatly appreaciated, crippledchicken ps this in in an onkyo m-282 2 channel power amp.

This just indicates the parts are not matched. If the parts are matched to start with the current draw should be close.
Sometimes aging will cause drift, but not double current flow through a circuit.
Like you have noticed, the matching is more of a feel good type of thing. I have measured differences like that and not been able to hear it.
If it really bothers you, try swapping out to get matched parts.

George
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Old 20th November 2004, 05:42 PM   #5
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Quote:
Originally posted by crippledchicken
it's for the othre channel i guess there's only two of them

Two of WHAT? Is this a quiz or what? Sorry, solve your stuff yourself.

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Old 20th November 2004, 08:10 PM   #6
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TWO DUAL, RESISTORS YOU KNOW? TWO LITTLE WHITE SQUARE COMPONENTS WITH THREE LEGS PER SQUARE. ONE OUTSIDE LEG GOES TO NPN OUTPUT EMITTER AND THE OTHER OUTSIDE LEG GOES TO THE PNP OUTPUT EMITTER ON SAME CHANNEL AND, THE OTHER CHANNEL IS DONE THE SAME WAY. i want to thank you, for your polite help george. don't think i deserved the quiz remarks though as i treat everyone with respect unless, provoked! oh well, i guess some people don't know what mutual respect is. crippledchicken
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Old 21st November 2004, 02:55 AM   #7
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Default Re: Re: quiescent current different on both channels?

Quote:
Originally posted by Panelhead



This just indicates the parts are not matched. If the parts are matched to start with the current draw should be close.
Sometimes aging will cause drift, but not double current flow through a circuit.
Like you have noticed, the matching is more of a feel good type of thing. I have measured differences like that and not been able to hear it.
If it really bothers you, try swapping out to get matched parts.

George
hi george, well i was wrong about not having trim pots. when i added the extra ps caps, i covered the trim pots he he. i removed the pots and installed the better multi turn type trimmers and rebiased and it's much better now. thats what happens when i don't pay attention i guess plus, this darn diabetes plays tricks on my eyes sometimes. reguards, crippledchicken


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