I'm sure they do but you may need to hunt. As you haven't told us the value[1] that you want, it would be pointless anybody looking for you.
If you can find decent pictures of the CPC ones - or you recognise the method of construction - you may be able to swap the rear of a single gang pot with the rear of the double gang, thus moving the switch from one to the other.
It used to be quite possible to mix'n'match pots in this way - including dual (unganged) pots with different front and rear values - if the original wan't available. The fixing lugs were easy to prise off and re-use on standard types by AB (also branded RS).
Fair comment. I was wondering if they existed at all.....
It's for a stereo volume control - I have a module that plays MP3's from a memory card and runs 2x5w to a couple of speakers. Whole thing sits in a wooden enclosure with a couple of speakers and a big dryfit battery.
All controls (vol / < / > / etc) are via pushbuttons - I'm looking to graft in a conventional rotary pot as a volume control (anything between 5k and 50k log or lin would do fine) - and if it also had a switch for the 12v dc to the MP3 module then that'd mean I only needed one 'user-accessible' control.....
That's a thought - but I'm not sure I'd trust CPC's photos - they seem to be very 'generic' sometimes...
Thanks - that's a thought - though a d/g pot and a separate switch might be the way I have to go....
Yes - understood.... I suppose I could put a couple of pushbuttons (vol up and vol down) on the front of the unit (see my reply to Terry to see what it's all in aid of).
At the moment it's all sort of gaffer-taped together - and adjusting the volume involves diving inside the unit and locating the tiny pcb-mounted switches - but a couple of bigger (more robust) push-switches might do the job...
I reckon you'd have to collect over 100 stereo amps before you found one with a power switch on the volume control. Such kit exists, but nowadays its going to be a job to find it. Why not put a wanted ad on fleabay. FWIW I'm sure-ish that the old Hacker stereo gramophones had such a pot. Nut I wouldnt be surprised if they had become collectable by now.
You could try Quad. Some of their older models (like the the 33 pre-amp) used what you need - and they're said to be still good at supplying spares for old stuff despite having been taken over. But it would likely not be cheap.
They're remarkably 'fussy' at our local tip - they really don't like you fossicking about in their 'pre-loved electronics' bin.....
I think I'll go another way - found a couple of heavy-duty toggle switches on CPC - use one for power and the other (dpdt-centre-off) to replace the 'volume up' and 'volume down' switches on the pcb...
The toggle switches are way over-specced, but the unit will be thrown into the back of a van & things may drop on it - so a bit of over-engineering isn't a bad plan!
I wouldn't use a linear pot for volume - log pots are a much better match for our very non-linear ears!
Well, a quick Google brings up lots cof queries just like yours - but no answers!
So, it looks like a separate power switch will be necessary.
If rotary action isn't a prime requirement, why not put two push switches in parallel with the existing switches for volume up/down? If you want it to look neat, you might find a range with a matching push-on/push/off power switch ...
As others have said, they used to, but might be hard to find now. The ones I recall had the switch on the rear of the pot, and had a cam attached to the shaft which operated spring-loaded switch contacts. It might be difficult to make something like that, but if you found a pot with a long input shaft (assuming those are still available too, even!) then maybe you could homebrew something on the front-side (along with a metal bracket to mount it all onto the front panel).
Is this for a main power switch, or something else? Adding an interrupter and an optical switch would be relatively easy[1] I think (more so than a nice clicky on-off switch) but does have the disadvantage that you still need to waste some power in the 'off' state.
[1] heck, you might even find a suitable pot that you could somehow graft that onto the back.
Hmm, maybe with a bit of jiggery-pokery the switch from a single-gang will transfer to an unswitched dual-gang?
True - but working on the principle of 'beggars can't be choosers'
Looks that way
Went down that route - dear old CPC have precisely the right parts in their online catalogue - except that one of them (either the momentary or the latching button) is 'awaiting stocks'. Having 'awaited' ffrom CPC in the past (more than 4 months on one particular item that never actually materialised!) - I perfer now to order things that are (allegedly) in stock......
sorry - didn't realise they were so old - I'll go back to my memories of the click when turning off the stereo, watching the dot disappear on the TV, .....
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