On 11/03/2011 14:41, Terry Casey wrote:
In on Fri, 11 Mar 2011
11:17:09 +0000
Adrian wrote:

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)

I wouldn't use a linear pot for volume - log pots are a much better match for
our very non-linear ears!

True - but working on the principle of 'beggars can't be choosers' g


- 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.....


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.

Looks that way


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 ...


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......

So - toggles it is!

Thanks
Adrian