[sdiy] DIY in the family

[harrybissell]

In the olden days... one contact was used for voltage (it 'made' first)
then
the second contact was used for 'key down' ... this activated the sample /
hold.

Bob Moog figured out a way to use just one, by superimposing an AC signal
for the S/H on the DC voltage from the divider string.  The first time I
saw
it it looked hokey... as usual Dr. Bob was right and I was wrong... its
quite
elegant.

Two or more contacts could be used for velocity sensing....

H^) harry

Martin Fay wrote:

> Tom wrote:
> >If you're doing digital (you did say MIDI) I'm not sure what you could
> >do with multiple contacts that you couldn't do with one, except maybe
> >some redundancy for a high-availability keyboard, with failover to the
> >second keyboard in extreme situations like having an elephant step on
> >the first one :-)
>
> Yes, just the one set of contacts would be needed to feed a scanner.
>
> >FWIW, even the duophonic Odyssey's 2- and 3-bus keyboards used only
> >one bus for CV.
>
> It's a long time since I've looked at Odyssey schematics. I wonder why
> they felt the need to use multi-bus keyboards as it must have added
> quite a bit to the cost?
>
> Martin
>
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