Topband: Relays in RX array
w8ji at contesting.com
Tue Mar 21 19:02:55 EST 2006
> I had a thread on here last year that discussed the topic
at length. The bottom line was that all relays will be
flaky due to oxidation and other issue on the
contactors.--unless you run a bit of DC through them.
I use regular 1-2 amp sealed DIP relays, and never once have
had a problem despite having dozens of relays in the signal
path. This is with about 20 years or so of use in some of
the switches. I recently just pulled a box I built in 1983
out of service, and the relays were still fine.
My suggestion would be to buy a low current sealed relay and
not worry about it. If you start to have problems, then it's
a simple matter to add contact bias.
Where I think you will get in trouble is using higher
current open frame relays, even those in plastic enclosures
or covers. They are often problematic when operated without
contact bias current.
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