[sdiy] Designing control surface, potentiometer heights?

[Richie Burnett]

Switch design is an art if you want the contacts to be reliable over a long 
time with variations in temperature/humidity, to withstand the heat of 
soldering, etc. etc.  Then there's make before break, or break before make, 
arcing, oxidisation, and self-cleaning.  I really wouldn't go there!

-Richie,



-----Original Message----- 
From: Jack Jackson
Sent: Tuesday, February 17, 2015 1:27 PM
To: Sdiy
Subject: Re: [sdiy] Designing control surface, potentiometer heights?

Hmm,

I had considered manufacturing my own as it's quite a basic 
electromechanical part with few components.

One could use 2 side PCBs as the wafers and the contain them in a 3d printed 
box with 3d printed shaft. If the box was designed like the internals of a 
Lorlin, the clicks could come from 2 balls and a spring.

Not sure what you would use to bridge the contacts. I suppose fashion a 
piece of metal.



----------------------------------------
> Date: Tue, 17 Feb 2015 13:05:37 +0000
> From: admin at bugbrand.co.uk
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Designing control surface, potentiometer heights?
>
> Yep -- Lorlin type rotaries are too f'ing tall for me -- there are quite
> nice Alpha ones for not too much $$$ available through Mouser (I now use
> Song-Huei equivs which are even more affordable but MOQ is 1000
> pieces..) - only shame being that you can't change the number of stops
> like on the Lorlin type
> Alpha SR1712F is, I think, what I meant (search via Mouser) - but hmm
> they're not so cheap... and I'm sure they had them with spline-shafts...
>
>
> On 17/02/2015 12:57, Ullrich Peter wrote:
>> You could use rotary switches from Knitter-Switch instead oft he big 
>> Lorlin types...
>>
>> MRS12:
>> http://www.knitter-switch.com/ger/Series/141
>>
>> MRS18:
>> http://www.knitter-switch.com/ger/Series/142
>>
>> Ciao
>> Peter
>>
>> http://www.ullrich.at.tt
>>
>>
>> -----Ursprüngliche Nachricht-----
>> Von: synth-diy-bounces at dropmix.xs4all.nl 
>> [mailto:synth-diy-bounces at dropmix.xs4all.nl] Im Auftrag von Jack Jackson
>> Gesendet: Dienstag, 17. Februar 2015 13:48
>> An: Sdiy
>> Betreff: [sdiy] Designing control surface, potentiometer heights?
>>
>> So I'm designing a control surface (Pots/sliders/switches/front panel). I 
>> want everything to be PCB mounted for ease of construction and 
>> reliability. A problem I've found is the body of the pot/switch before 
>> the shaft/actuator can vary greatly in height. So my rotary switches 
>> (Lorlin type) are 20mm or so high in the body, whereas the pots and 
>> sliders are only around 7mm. See the link for an illustration in CAD: - 
>> https://flic.kr/p/qhipLE
>>
>> The only solutions I can think of are to make 'scaffolding' PCBs around 
>> the same footprint as the pots/sliders to increase the height of them and 
>> bring them in line with the switch, or to mount them on a separate PCB 
>> and put holes through for the switches to go through.
>>
>> Any thoughts?
>>
>> Best Regards,
>> Jack
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