[Elecraft] K3 Aux power relay source

[Tom W8JI]

I'm 100% with Don on this.

>I don't understand what all the fuss about specific relays is all about.
> Any relay that can handle the current desired and has a 12 volt coil
> will do the job.

Actually the only common relays that MIGHT be a problem are certain 
automotive relays intended for intermittent duty use. Some horn and starter 
relays are not designed for continuous duty. :-)

> Relay speed is not a consideration, it will pull in when the K3 is
> turned on, and will stay in that state until the K3 is turned off, so
> operating time is not a factor, only the contact current rating (must be
> sufficient for whatever accessories you wish to power), and the relay
> coil must respond to 12 volts and draw less than 500 ma.

Which is almost any relay except certain automotive relays. A 6 watt coil is 
very rare, except in really big relays. Most traditional power relays in the 
15 amp contact range will be 150 mA coils or less and cost a couple bucks 
from mail order houses.

73 Tom