[Elecraft] The state of a latching relay

Fri Jan 24 21:30:00 2003

     Current in one direction latches one state -- opposite in the other.
The relays are biased against a cap, so as long as you apply a logical
voltage for a period long enough to charge/discharge the cap, as soon as
you switch the logic state, a potential will exist between a gate
input/output and cap that are at opposite potentials. The relay will
follow.  If you flash them all on then off, you will have established
known state and charge and you can then change any one at will.

On Fri, 24 Jan 2003, Sverre Holm - LA3ZA wrote:

> If I understand right, the latching relays in the K1 and K2 change state
> every time you give them current for a short while, and then stay in the
> new position until the next impulse is given to them. To my mind this
> makes it impossible to figure out which position they are in, but I'm
> probably missing something here.
>
> So the question to the clever ones is: How does the firmware in the K's
> know the relay settings?
>
> 73
>
> Sverre Holm, LA3ZA
> ------------------
> www.qsl.net/la3za
>
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