Kees,
V4 is identical.? I looked.
Initially I looked at it and thought it clever.? Then it started nagging at me.
The contact capacitance or isolation is worrisome. Did a maybe the relay
has majik and it works.? Testing was, Oh, my!
As to your conclusion. Resistance is very small save for dry and hopefully
bifurcated contacts and the right?material or it will age badly and maybe
become open(intermittent).? ?Long term issue.
More relays and better layout, Exactly.? ?
I'd also opt for better placement of the TR relay and paths.
No need for three control lines for?4 states as well.? ?I'm sure many would
want to have a spare IO? pin.? I did!
Allison
