Re: 1010 pedal recycling station

[andy butler <akbutler@tiscali.co.uk>]

mark francombe wrote:
> ahh.. ok thanks Andy,
> i must admit that my plan was still firmly on the drawing board. If its 
> anything like the Space Station pedal, where the LED is on a movable rod 
> operated by the pedal, then Im pretty sure I can exchange the sensor for 
> a photoresister...

The LED and photo-sensor are fixed, and a piece of plastic film
with a gradient on it moves between them.

I don't remember exactly what the sensor is.


> have to check up on what is a normal pot in a 
> expression pedal... guessing 100 or 500.. 

20k ohm or 10k linear.
(although Yamaha/Zoom use 100k...I think it's log)

> Plan is getting more tricky, but not time to totally discard yet..? 4 in 
> a row would make a handy little enclosure...

Creating a circuit that would accurately mimic a pot would probably 
be the stumbling point. Particularly, I can't think how you'd
get the full range...but of course you haven't said you needed that.
If you're after a 0-5V control voltage then I bet you could use
the original Behringer components as a basis, with a bunch of op amps.

I've always used cheap Bespeco pedals and never had any unfixable problems,
...possible to get 4 on ebay for about sixty quid.

andy
ps don't go for the Alesis pedals...weird mechanism that responds v.slow
when you toe down.