The solution you came up with is the first one several others did too, including myself. Even with no switch operation current flows through both coils all the time, not an acceptable situation.
Latching relays come in both one (where current direction determines latch and unlatch) and two coil versions. The two coil type is easy to changed into a one coil by adding a diode to each coil to steer the current to the appropriate coil. Norm S/V Bandersnatch Lying Julington Creek 30 07.695N 081 38.484W > [Original Message] > From: Ken James <[EMAIL PROTECTED]> > To: <[email protected]> > Date: 7/28/2008 6:50:00 PM > Subject: Re: [Liveaboard] 1 wire relay cntl - fr. 12 VDC buss > > Norm, if the goal of the design is to control two > functions via latching relays via one wire, first > let me ask a question. > > If the latching relays latch in the needed > position, what causes them to "unlatch"? Are they > dual coil relays? > > If the latching relays are dual coil relays, here > is a potential way to accomp the goal. > > Connect the DPDT sw as you suggest so that it > sends either a pos or neg polarity voltage (or > 'floats') along the wire. > > Use diodes at each relay to get the polarity > needed to actuate and latch that relay or > conversely through other diodes with the opposite > polarity applied the result would be to energize > the other coil of that relay and un-latch it, and > that polarity would also at the same time latch > the other relay. > These diodes normally have only .6V drop max but > if that is too much, use shottkeys they have as > low as .1V drop. > > There are ways to do it if the relays are not dual > coil but use opposite polarity to unlatch but it > gets more complicated. -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 _______________________________________________ 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
