Re: [sdiy] 61 Note Keyboard from Electronic Goldmine

[Roman]

Your asssumptions are correct.
This is velocity sensitive keyboard, as stated in Goldmine catalog. Scanning circuitry scans twice more contacts than there are keys to determine travel time between first contact closing and the second. The faster key is hit, the shorter the time.
Aftertouch however is usually made with resistive strip laid below keys, more to keys front than key contacts. When key is pressed, resistance of this strip changes. This can be conductive rubber on 2 long contacts, or some forky style contacts etc.

Roman

---- Wiadomość Oryginalna ----
Od: Scott Stites <scottnoanh at peoplepc.com>
Do: synth-diy at dropmix.xs4all.nl
Data: Thu, 19 Jun 2003 00:30:15 -0700
Temat: [sdiy] 61 Note Keyboard from Electronic Goldmine

>Hi all,
>
>I ordered one of those 61 weighted key keyboards from Electronic Goldmine,
>and received it tonight.
>
>http://sales.goldmine-elec.com/prodinfo.asp?prodid=8280
>

<snip>

>
>Could this be used for some type of velocity or after-touch function?  I'm
>not familiar with this arrangement at all (I don't get a chance to dissect
>too many keyboards).  If anyone knows, please enlighten me!
>
>I'm tickled pink with this keyboard, I'll post pictures of it on my web page
>if anyone else is interested in scoping it out in better detail than
>Electronic Goldmine provides.
>
>Thanks for the bandwidth,
>Scott
>
>