Geoff/W5OMR wrote:
Either way, a millisecond or two is about all you
need, and quite negligible. Just make sure you have
enough capacitor to discharge the resulting spark of
Back EMF from the contacts, when the relay is
actuated.
Er... that is to say, when the relay is 'relaxed', and no current
flowing through it's coil, the contacts are closing a circuit. It
doesn't matter if it's AC or DC, you gotta get the resulting arc off of
those relay contacts, otherwise, bye-bye relay.
I found this out the hard way, when I didn't put some sort of capacitor
across the relay contacts of a PTT modification on one of my Viking
II's. Didn't take long for 600v @ 180mA to eat those contacts alive!
--
Driving your AM Rig without a scope,
is like driving your car at night, without headlights. (K4KYV)
--
73 = Best Regards,
-Geoff/W5OMR
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