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Old 26th April 2003, 09:46 PM   #1
blip is offline blip  United States
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Default GainClone Volume Control Q

Hi,

I'm building a shoe-string budget gainclone for my father (who is VERY definitely not an audiophile but does need a couple of small audio amplifiers). If I like what I hear from the GC I may build a better one later for myself.

I have run into one problem, though. He doesn't have a pre-amp in his system (like I said not DEFINITELY not an audiophile) so I need to put the volume control on the GC itself. The inverted schematic calls for a 50k audio taper pot... but I can't find one from the sources that I am ordering from. (Actually, I can find one but it is so cheap that I assume its matching is beyond attrocious)

My sources do have a nice (well nice enough for this use) Panasonic 10k audio taper pot. Would it be okay to substitute it for the 50k or would that result in lousy control?

Thanks in advance for your help.
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Old 26th April 2003, 10:35 PM   #2
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10k is just fine, for line-level signals. I think 50k would be too much... gives not-enough control in the ranges you'll likely be listening.

Cheap pots probably mean a fake audio taper, and those are only barely tolerable for consumer-grade stuff. I can't live with them... but, finding the real deal is so hard...

In short, go for it... 10k should be enough resistance... good luck with the project.
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Old 26th April 2003, 11:33 PM   #3
blip is offline blip  United States
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Thanks for the quick reply, nappy. I'll change it over to the panasonic.
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Old 27th April 2003, 01:11 AM   #4
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40 minutes is hardly quick in my book but... no problem. :-)

Have fun. :-)
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Old 27th April 2003, 05:30 AM   #5
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Default Re: GainClone Volume Control Q

Quote:
Originally posted by blip
The inverted schematic calls for a 50k audio taper pot...
It actually calls for a linear taper pot... a clever trick to help with the pot inside the feedback loop.

dave
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Old 27th April 2003, 06:23 AM   #6
Bricolo is offline Bricolo  France
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Default Re: Re: GainClone Volume Control Q

Quote:
Originally posted by planet10


It actually calls for a linear taper pot... a clever trick to help with the pot inside the feedback loop.

dave



can you tell me more about this?
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Old 27th April 2003, 07:55 AM   #7
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Default Re: Re: Re: GainClone Volume Control Q

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Originally posted by Bricolo
can you tell me more about this?
here is a post by Joe Rasmussen that does a good job of explaining it.

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Old 27th April 2003, 09:59 PM   #8
blip is offline blip  United States
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I was working off of the Peter Daniel schematic which (if memory serves) calls for a 50k log pot.

Do you think that the advantages of doing the linear pot trick are worth the extra complexity? Are there any drawbacks?

Sorry for questions... but I'm still new to this and Joes description of it went way over my head.
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Old 27th April 2003, 11:10 PM   #9
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Quote:
Originally posted by blip
I was working off of the Peter Daniel schematic which (if memory serves) calls for a 50k log pot.
That is actually my drawing and it doesn't actually specify.

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Old 27th April 2003, 11:28 PM   #10
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When I decided to use 50K log pot I didn't realise all the feedback issues and the fact that linear might work better. I just put it in a circuit and I really don't see any drawbacks. It behaves like it supposed to, with a good controll over the hole range. I will try to built Joe's circuit and see how it compares sonically
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