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Old 23rd August 2015, 09:24 PM   #1
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Default Potentiometer with ON/OFF switch?

I was wondering if anyone knows where I can get a push-pull dual gang potentiometer?
I'm building a compact stereo amp so I'm trying to keep the part's number down to a minimum, and I thought that turning the amp on and off by the volume knob would be a cool idea.
I did find this online: Dual Gang Potentiometer, Audio Taper, with Push Pull Switch DPST 1/4 inch X 7/8 inch Shaft
But I'm a little uneasy about purchasing off random sites

Has anyone come across these before?
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Old 23rd August 2015, 09:36 PM   #2
rayma is offline rayma  United States
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Quote:
Originally Posted by TheRogueOne View Post
I was wondering if anyone knows where I can get a push-pull dual gang potentiometer?
I'm building a compact stereo amp so I'm trying to keep the part's number down to a minimum
I'd avoid doing this if you can. It was routine in many older integrated amplifiers, but having 120VAC near
the audio is not a good idea. Also, the control wears out faster, and you can't use the very bottom
of the range, because the on/off function requires around 30 degrees of rotation. Good volume controls
just don't have this option.
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Old 23rd August 2015, 09:37 PM   #3
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I have used this supplyer for more than 10 years, never a problem.

https://www.tubesandmore.com/products/R-VS-1MA-SS
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Old 23rd August 2015, 09:40 PM   #4
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More common as far as I know is where ON is achieved by turning the pot
toward the right hand side, and OFF hard to the Left. The Quad 33
as a preamp used such a switch on the volume control pot.

If the 10k ohm range and its taper, and type suits then you have already
found what you need.

You can always arrange less current to the switch function by making
the pot switch activate a relay coil and the relay then do the heavier
duty of turning on, however would require some small current DC circuitry
that is ON before the switch activates

Try the large stockists like Mouser Farnell RS and Digikey
they will have many choices for you.

Cheers / Chris

Last edited by Chris Daly; 23rd August 2015 at 09:45 PM.
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Old 23rd August 2015, 09:55 PM   #5
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I'm specifically looking for a dual pot
Unless there's some way of using a regular single pot as a stereo volume knob?
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Old 23rd August 2015, 09:57 PM   #6
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Quote:
Originally Posted by rayma View Post
I'd avoid doing this if you can. It was routine in many older integrated amplifiers, but having 120VAC near
the audio is not a good idea. Also, the control wears out faster, and you can't use the very bottom
of the range, because the on/off function requires around 30 degrees of rotation. Good volume controls
just don't have this option.
Besides wearing out faster, is there any sonic issue or health hazard with doing this?
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Old 23rd August 2015, 11:26 PM   #7
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"I'm specifically looking for a dual pot
Unless there's some way of using a regular single pot as a stereo
volume knob?"

Look at all the pots on their site, you will find a dual with a switch in different resistance range.
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Old 23rd August 2015, 11:30 PM   #8
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Quote:
Originally Posted by brucetassin View Post
Look at all the pots on their site, you will find a dual with a switch in different resistance range.
I haven't found one with an on/off functionality on there. Any links would be appreciated
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Old 24th August 2015, 05:23 PM   #9
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try oldradioparts.com - will probably have to Email them

dual-gang audio with a switch is going to be tough. Mouser has discontinued carrying the Alpha line

Charles
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Old 24th August 2015, 05:35 PM   #10
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by TheRogueOne View Post
I'm specifically looking for a dual pot
Unless there's some way of using a regular single pot as a stereo volume knob?
It can be done...but its not easy... you don't want to go there

Switched pots aren't the way to go in all this really. Use a separate mains on/off switch that's up to the job. Interrupting (switching) the current to a large power transformer can generate significant arcing at the switch contacts due to the large inductance of the primary winding.
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