If the goal is to make a two coil latching relay be controled by a single wire input, a similar approach to what I suggested for the two latching relays would work.
Connect the single input wire (A) to the coil of a SPST relay (N.O. contacts). Connect a diode in series with the coil of the SPST relay so only neg polarity actuates it, the other end of the coil being connected to pos. Before the SPST relay coil and the diode, take off a wire. This will be wire (B). The points of the SPST relay are connected to a pos input, the output of the points of the SPST relay is wire (C). Now, wires B and C form the control pair. They are connected to the latching relay coils, one wire (B or C) per coil. Connect these coils with diodes in series with them so that only positive polarity will energize them, the other end of these coils will be connected to neg. When A is neg, B = - and C = + so one coil of the latching relay will energize. When A is pos, B = + and C = 0, so the other coil of the latching relay energizes. When A is 0, B = 0 and C = 0 so the latching relay remains in its last state and no coil current flows. No current flows through the coils except when one or the other of them has a pos coil input, and then current only flows through that coil not both coils. Parts needed; one small SPST N.O. 12V relay, three diodes, misc. wire etc. I would prob put diodes across all the relay coils also to clamp the inductive spikes they will make and keep them from stressing the steering diodes. You may want to fuse the circuit also of course. I would locate the SPST relay close to the control switch(s) that outputs to wire A so all control wires will have close to the same voltage, but this is prob not at all critical. -Ken _______________________________________________ Liveaboard mailing list [email protected] To adjust your membership settings over the web http://www.liveaboardnow.org/mailman/listinfo/liveaboard To subscribe send an email to [EMAIL PROTECTED] To unsubscribe send an email to [EMAIL PROTECTED] The archives are at http://www.liveaboardnow.org/pipermail/liveaboard/ To search the archives http://www.mail-archive.com/[email protected] The Mailman Users Guide can be found here http://www.gnu.org/software/mailman/mailman-member/index.html
