[sdiy] keyboard question and generating cv

[dragons]

Hi,
well I agree with Samppa here.
it depends on the circuit used for generating the cv voltage.
I think that a lot of the circuits would " assume" that you are going to 
be using a switch that has a low consistent resistance when pressed.
and the contacts that work by having a conductive pad on the pcb and 
conductive pads on the rubber contacts simply don't have a consistent 
resistance when pressed.
this would probably give problems generating a CV voltage.
using reed switches / metal contacts is a much better way of doing 
things. the only reason why commercial manufacturers don't use these is 
down to cost.
regards Peter B


Ian Smith wrote:
> Hi all,
> I'm thinking of making a controller for my synth. I'm going to fashion it after a concertina. It's going to be a CV controller, not MIDI. 

I want to etch the buttonboard like a commercial keyboard to reduce the 
amount of rat's nest. My question is this:

The black stuff that covers the contact points on commercial keyboards, 
what is it? where do I get it? and Is it really necessary?
> -Ian Smith
> _________________________________________________________________