small potentiomenter with switch

Google says Alibaba

Second best is ebay eg

Owain

I'd first look on Ebay. Although finding it might take time.

I'm sure you can still get them, but not always in the law and value you need in my experience. Log anti log or linear etc.

Farnell used to have some, not looked these days since I am out of that game due to lack of sight of course. Brian

Get one out of a scrap radio is the literal answer.

Tell us about the mouse project !

PA

cheers a bit pricey though hopping for about £1

It's for a small project to get students (those interested in hardware) to adapt an old mouse or we can supply one so they can have rapid fire button with speed adjust. So need to switch it off for normal use too. unfortunately these seem more expensive (over £3) than the mice we buy ;-)

yes I know there maybe a software solution but we need to attract more than just keyboard kiddies to hardware.

looking to buy 20-40

True but quantities seem to be in 1000s, will get my manager to ask, see if they can supply 20 or so samples.

Here are some thumbwheel pots without switches from DigiKey (starting from £1.09). Perhaps you can activate an electronic switch when the resistance is near zero.

maybe but this might make the circuit board to large to get inside a mouse, a 555 will change the M/S ratio for speed, night have to use a separate switch to isolate the 555 o/p but there's a need to keep it small and simple with as few holes needed to drill into the mouse and not make the mouse difficult to use in the normal way. Might well need a rethink or maybe it's not as practical to do as we first thought for students with little or no hardware experience.

Respect! That's a brilliant project.

"thumbwheel potentiometer switch" produces 25 10k log taper for about £30 on ebay.

Hope you don't need LINear. !

Cheers althouth TBA these type may be a problem mounting on a mouse. Currently using a finger preset

now need to find a small , cheap, round mount hole switch.

We try to run 4 or 5 of these type activities a year for students they aren't marked or compulsary just a fun activity but the days of using a LED , 555 based egg timer are well gone. Need to think of something that can't be done on a phone or watch and students can show off to friends.

enter pcb thumbwheel volume control in ebay

Good luck then.

Incidentally you could probably do what you want to do with two small press or touch switches - and a microcontroller. Shoving your students in at the deep end, I guess - but it could be a forward-looking approach.

And it could then simulate LOG, LIN, Ballistic or whatever.

And make LEDs flash !

PA

Far to advanced and difficult to do., due to size restriction. These are 1st year students even final year students would have problems with that.

No point as the interface on the computer wouldn't see that effect.

No that's more like it. :-)

$0.036 each (+shipping):

These pricier ones look to have a switch:

Theo

You might be surprised! When I was at University - late 60s - nobody seemed to have heard of devices with more than four pins - and the idea of system engineering was unheard of. I broke the mould with a mass of TTL - but the thing everyone came in the lab to be hypnotised by was a relatively simple pseudo binary sequencer used to try to break the main design. It ran at many megabits per second, but I included four Lilliput bulbs driven by certain bits of the pbs, but only updated every second.

A real crowd puller!

PA

Cheers but the problems mounting might be to huge a step.

I'm sure you'd be more surprised by the level our student tend to be ;-)

In those days the bright went to university, now it is more for those that can't get a job after leaving school.

nobody

TTL ! the first chips I can across were DTL when working as a school tech.

but the thing everyone came in the lab to be hypnotised by was a

Well this is why we are trying to find activities that get their interest and put their smartphones away.

There are ones with wheels too.