I am working on the band switching hardware for my latest 160/80/40 vertical
project and will be using some 26.5 V vacuum relays in the circuit.
This may be a long shot, but I am trying to find a web site where a fellow
showed how to power a 26.5 V vacuum relay from a 12 V source. It relies on the
property that relays only momentarily require the rated coil voltage and that
is during pull-in. After that, they will remain in the energized state with
much lower voltage; sometimes a quarter of the pull-in voltage, or even less.
So the circuit initially produces enough voltage to energize the coil and then
drops to 12 V. Of course now that I need the web-site information I cannot find
it, or the circuit which I had printed at one time.
What I sort of recall about the web site is it was hosted by a 6-land radio
amateur. And he had a bunch of information about HF amplifier stuff on the
site. I am working from memory here so what I truly remember is prone to error.
There was a circuit in QST, Hints in Kinks, a few years ago but it isnât
quite what I was looking for. Any ideas or leads will be appreciated.
â73, Thomas â AC7A (Tucson)
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