[HAM] How hard would this be?

[Hugh]

Here's one example of an 8-channel switch:

http://www.supertex.com/pdf/datasheets/HV219.pdf

If you search for "analog multiiplexer switch" in google you'll get a 
bunch of different examples. The one above looks expensive since it's 
for hospital equipment. On the other end of the spectrum there's the 
old MC4066 4-channel switch, but the insertion loss is prohibitive 
with hundreds of ohms in the on state. I think you'd have to go the 
expensive route to get anywhere near 11 ohm on resistance like the 
HV219. That happens to be awfully close to Hammond resistance wire impedance.

I used to design and build time domain reflectometry analog 
multiplexers where we were measuring picosecond time delays and we 
were looking for a cheap low resistance high bendwidth chip but none 
existed at the time and they probably still don't. We ended up using 
surface mount switching diodes.

Hugh


>Interesting concept on those 8 channel solid state switches, where do
>you get those?
>That would be perfect for each key and a single switch for the
>percussion on the upper
>Manual.