[sdiy] Small Resistors and slider pots-Farfisa

[KHeck73 at aol.com]

In a message dated 4/3/2001 9:09:15 PM Eastern Daylight Time, 
jlarryh at iquest.net writes:


> when I was in high school (many years ago) I played
> in a band and used a Farsisa VIP233 keyard.  The volume pedal was optical
> However, the variance method was different.  It used a fixed light source
> and a fixed light sensing device.  The pedal pushed a piece of metal or
> some other material between the fixed source of light and pick up that had
> a slot that was very narrow at one end and got wider at the other to let in
> more light.
> 
> The more I think about this type of arrangement I think it would be real
> cool
> as you could have any kind of "taper" you wanted on your pot based on how
> the "light slot" was cut.
> 
> Larry Hendry
> 

Wow, what a list. I still have my VIP233 from high school. It was my source 
of polyphony for my homebrew Paia (out of the R-E article). Together with a 
Big Muff Pi fuzzbox I could bang out a mean rendition of Frankenstein 
(complete with the monster coming to life!), or attempt Space Truckin' ;) . I 
really need to refurbish that thing, and wonder if anyone here has done so. I 
think I can get a schematic from Mark Glinsky, but does anyone have any tips? 
Last I checked (a long time ago) it seemed many of the key contacts need 
cleaning because many keys stopped working, but not from abuse. Also, I was 
always intrigued as to the meaning of the "Slalom" socket on the bottom. I 
assume it was for a pitch bend pedal... can I make one? I think the 
instrument could be modded for more outputs to use as extra audio sources for 
a modular setup, or for control inputs, for example, through the Slalom pitch 
control circuit.

Oh yeah, I have the volume pedal and guess I could try taking it apart if 
someone wants to know more about how it works.
-Karl.
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