General CV question (Re: [sdiy] Paia MIDI Fader)

[harry]

You might try Interlink Electronics... they have a Force Sensing Resistor
design kit for about $90.... (shipped)  It has an assortment of interesting
small medium and large sensors... including round, square and ribbon
shapes.

I haven't tried mine yet...

H^) harry

sarth at sarth.net wrote:

> Hi,
>
> I am a little new and have 2 questions for the list ...
>
> 1) Does anyone have a favorite place to buy variable-resistance sensors?
> I found a light-sensitive photocell that varies it's resistance in response
> to illumination at radio shack, but that's about it.
>
> 2) I think I'm having trouble grasping a basic concept:
>
> There seems to be 2 different types of inputs that accept variable voltage
> or resistance.
>
> The back of most MIDI synths have a CC pedal input, and I presume that pedal
> is varying the resistance of a signal passed through it. However CV inputs
> that want a 0-5 V range seem to operate on a related but different
> principle, in which power is provided to the pedal and the voltage is
> measured across 2 other connectors?
>
> The paia midi fader kit illustration shows it measuring variable voltage
> sources AND having a variable resistor hooked up to 3 inputs simultaneously.
>
> I want to buy sensors from infusion systems ( http://infusionsystems.com )
> and hook them up to the paia midi brain. Someone told me I'd have to rig up
> a voltage divider circuit and sent me the url for this peavey 1600 mod:
>
> http://music.columbia.edu/%7Edouglas/pc1600mod/pc1600mod.html
>
> I just don't understand the distinction between these types of variable
> resistance/voltage circuits. Any clarification would be greatly appreciated.
>
> -- Sarth