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Old 19th October 2006, 09:00 PM   #1
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Default How to wire vol control pots to chipamp?

I would like to use my Briangt LM3875 gainclone with a Marantz CD5001 CD player that has no volume control.

I understand I need to be sure the two sides are relatively close in terms of resistance at any particular point for proper balance.

QUESTION: What is a recomended value - I have 3 dual pots to choose from, I believe all are logarithmic - 10K, 25K, 50K, or 100K?

QUESTION: How are these to be wired in the case of the chipamp? IN SERIES? Do I route CD player signal 1 to the center of POT SECTION 1, then another terminal of POT SECTION 1 to the amp? In effect, then, the variable pot resistance value just goes in series between the CD Player input signal and the amp input.

Then same for input line 2 using the second section of the dual pot?
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Old 19th October 2006, 09:37 PM   #2
kmj is offline kmj  Sweden
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Try the 10K or the 25K

You wire them in series with the source (or inputseletor in case of multiple inputs.)

The pots I've used have had 3 pins on each side (input, output and ground) and you wire them in this order. Now, mind that tere are different types but on the one I have the input is at the far left, output in the middle and ground to the right, this if the pins are upward and you want to raise volume by turning the knob clockwise.

Each channel in situated in a row.

On the pot below (alps) it is from the left (or the pin farthest away:
ground, output, input.

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Old 19th October 2006, 10:20 PM   #3
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If I use the 25K pot, you are saying that each of the two inputs (center of each RCA jack) ties to the chipamp star ground through the 25K path in a pot. The center tap of the pot ties to the input of the chipamp.

Is this logic correct? Is this schematic correct?
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Old 20th October 2006, 02:40 AM   #4
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yup.. thats the shizzle
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Old 21st October 2006, 12:00 AM   #5
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Wait! There is an old thread in this forum that advises to ground the third pot leads to the signal ground, not the star ground...

Which is correct?

I think the signal ground makes more sense...
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Old 21st October 2006, 07:37 AM   #6
Nordic is offline Nordic  South Africa
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He is probably refering to the signal groundstar SGS.
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Old 21st October 2006, 03:31 PM   #7
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What is a signal groundstar sgs?

Does the attenuator pot get wired to the rca jack grounds (signal ground) or star ground?
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Old 21st October 2006, 04:45 PM   #8
Nordic is offline Nordic  South Africa
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Erm thats "normaly" formed on the ground tab of the RCA input...
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Old 21st October 2006, 05:11 PM   #9
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what is "erm"?
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Old 21st October 2006, 05:53 PM   #10
Nordic is offline Nordic  South Africa
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Lol, now your going to ask me what lol is... it is, erm, of no concequence....
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