[sdiy] 1 Meg input level pots?

[Tom Wiltshire]

On 19 May 2007, at 10:00, Andre Majorel wrote:
> On 2007-05-18 23:57 -0700, JAMES GALLANT wrote:
>
>> A while back I bought several very high quality 1 Meg linear
>> panel mount pots for way-mass-cheap. [...] perhaps you could
>> offer some pointers as to what they could be used for in an
>> analog application.
>
> The CGS03 Psycho LFO uses one in the feedback loop of a Schmitt
> trigger for rate.
>
> The CGS21 "Super Psycho Modulation Source" uses six in the same
> fashion.
>
> Oakley Little LFO uses one to "pan" between two outputs of an
> analogue switch for the shape control.
>
> Some circuits also use 1 M log pots :
>
> - The Oakley ADSR VCA uses three as variable resistors for attack,
>   decay and release.
>
> - The Oakley Little lag uses two as variable resistors for the up
>   and down slopes.
>
> - The Oakley Little EG uses two as variable resistors for attack
>   and decay/release.

I second this. They'd be ideal for use where you want a good wide  
control range, from fast through to very slow, so think LFO 'rate'  
controls  and Envelope Generator 'attack', 'decay', etc. You can  
probably get a 1:10000 range out of them.

In these applications, you won't need to worry about thermal noise.