TopBand: Remote Beverage Switching

[William H. Launer]

I once ran some scope tests on suppressed vs. unsuppressed relay coil
transients.  The results were startling - an unsuppressed 28 vdc
hermetically sealed aircraft relay can easily generate 600 volt spikes
at the coil terminals.  The addition of a back-biased diode across the
coil nearly eliminates the spike.

Bill wb0cld


Bill Launer
St. Charles, MO
launerb@crl.com
wb0cld@wb0cld.ampr.org [44.46.66.25]
qrp-l #279      qrp arci #3551
Grid Square EM48RT



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