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Rod Speed Rod Speed is offline
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Default small potentiomenter with switch



"whisky-dave" wrote in message
...
On Friday, 23 April 2021 at 23:14:34 UTC+1, Rod Speed wrote:
"whisky-dave" wrote in message
...
On Friday, 23 April 2021 at 21:11:43 UTC+1, Peter Able wrote:
On 23/04/2021 11:31, whisky-dave wrote:
On Wednesday, 21 April 2021 at 19:42:11 UTC+1, Peter Able wrote:
On 21/04/2021 13:29, whisky-dave wrote:
On Wednesday, 21 April 2021 at 12:18:47 UTC+1, Peter Able wrote:
On 20/04/2021 22:17, whisky-dave wrote:
On Tuesday, 20 April 2021 at 20:09:11 UTC+1, Peter Able wrote:
On 20/04/2021 11:47, whisky-dave wrote:
Does anyone know where I can buy those old school type small
potentiomenter with switch you know the ones like they had on
the
first hand held radios in the 60s-70s and on walkmans and
stuff
just a little wheel and the click for volume control. And
cheap
of course

I know I could by the standard rather large pots with DSPT but
I
want to put
this thing inside a mouse (computer mouse that is) .

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

Tell us about the mouse project !

PA
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

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. !

https://www.ebay.co.uk/itm/25-LOT-10...8AAOSwpNRe4-zG

PA

Cheers althouth TBA these type may be a problem mounting on a
mouse.
Currently using a finger preset
https://www.rapidonline.com/suntan-t...st-pot-68-0242

Although it appears just adjusting the frequence of a 555 or the
M/S
ratio doesn;t give a very good range.
Seem both frequency and M/S may need tweeking which is a pain.

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.

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.

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.


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

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



And make LEDs flash !

No that's more like it. :-)


PA
You might be surprised!

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

s When I was at University - late 60s -


In those days the bright went to university,


Not just those, the more stupid trained to be teachers there.


It depended on where their interest were, a few of our ex
students are now lectures, one became head of department.


I meant school teachers.

Even nurses are uni qualified now.

now it is more for those that can't get a job after leaving school.


BULL****.


We get a quite a few from "Clearing" which is those that have failed to
get
into their preferred courses they have applied to study, so they lack the
relatively high grades in physics and maths that are needed so fall
behind.


Thats nothing like your previous. And isnt true of arts students either.

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 -

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


The first I used was RTL.


Still a step up from valves


The second two computers I used were discrete transistors.
The IBM 360/50 was SLT but I didnt do the maintenance on that one.
https://en.wikipedia.org/wiki/IBM_So...gic_Technology

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!

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