Gainclome Volume Control using Log Stepped Attenuator

PaulHilgeman · 5th February 2003, 07:21 PM

How can I get a nice volume control out of a 24 step 100K log stepped potentiometer? I am makining a gainclone.

Thanks,
Paul

PaulHilgeman · 5th February 2003, 07:25 PM

Actually it isnt a setepped potentiometer, rather a stepped attenuator (individual resisitors)

Peter Daniel · 5th February 2003, 07:27 PM

What is exactly that you asking for?

PaulHilgeman · 5th February 2003, 07:32 PM

Just a recomendation on how this would work best and give me a linear volume control (linear sounding).

Most people recomend a linear Pot on the input, and then the center tap to be connected to the 10K resistor. Do I hook it up just like that? Or is there a different way that would work better for a log attenuator.

-Paul Hilgeman

janneman · 5th February 2003, 07:36 PM

I don't get it.
Is your stepped control linear or log? And how do you know?

Jan Didden

PaulHilgeman · 5th February 2003, 07:40 PM

The actual resistance values of the attenuator increase in a logrithmic fasion. I know because that is what it said when I ordered it

.

PaulHilgeman · 5th February 2003, 07:46 PM

http://www.marchandelec.com/att.htm

It is similar to the AT24 on this site, ordered in 100K with a 'logrithmic' scale

Thanks for the quick replies,
Paul Hilgeman

janneman · 5th February 2003, 07:46 PM

So, you have a log volume control. That's what you wanted. That's what you ordered. That's what you got. You turn it, each step gives a constant dB attenuation. OK?

Jan Didden

PaulHilgeman · 5th February 2003, 07:48 PM

Do I simply replace the 100K Linear Tapper found here:

janneman · 5th February 2003, 08:19 PM

Ah!
The circuit you show needs a linear taper to get log control because the vol control is in the feedback circuit. The best move would be to return the log taper you have and buy a lin taper.
If that is not possible, you could just use the one you got and see if it works OK, chances are it is acceptable.
Else, I don't know any solution barring replacing the resistors on the controls.

Anybody else has some ideas?

Jan Didden

5th February 2003, 07:21 PM	#1
PaulHilgeman Account Disabled Join Date: Dec 2002	Gainclome Volume Control using Log Stepped Attenuator How can I get a nice volume control out of a 24 step 100K log stepped potentiometer? I am makining a gainclone. Thanks, Paul

5th February 2003, 07:27 PM	#3
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	What is exactly that you asking for? __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

5th February 2003, 07:36 PM	#5
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 1	volume stuff I don't get it. Is your stepped control linear or log? And how do you know? Jan Didden

5th February 2003, 07:46 PM	#8
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 1	volume So, you have a log volume control. That's what you wanted. That's what you ordered. That's what you got. You turn it, each step gives a constant dB attenuation. OK? Jan Didden

5th February 2003, 08:19 PM	#10
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 1	volume Ah! The circuit you show needs a linear taper to get log control because the vol control is in the feedback circuit. The best move would be to return the log taper you have and buy a lin taper. If that is not possible, you could just use the one you got and see if it works OK, chances are it is acceptable. Else, I don't know any solution barring replacing the resistors on the controls. Anybody else has some ideas? Jan Didden


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5th February 2003, 07:25 PM	#2
PaulHilgeman Account Disabled Join Date: Dec 2002	Actually it isnt a setepped potentiometer, rather a stepped attenuator (individual resisitors)

5th February 2003, 07:32 PM	#4
PaulHilgeman Account Disabled Join Date: Dec 2002	Just a recomendation on how this would work best and give me a linear volume control (linear sounding). Most people recomend a linear Pot on the input, and then the center tap to be connected to the 10K resistor. Do I hook it up just like that? Or is there a different way that would work better for a log attenuator. -Paul Hilgeman

5th February 2003, 07:40 PM	#6
PaulHilgeman Account Disabled Join Date: Dec 2002	The actual resistance values of the attenuator increase in a logrithmic fasion. I know because that is what it said when I ordered it .

5th February 2003, 07:48 PM	#9
PaulHilgeman Account Disabled Join Date: Dec 2002	Do I simply replace the 100K Linear Tapper found here:

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