Ken, Reed relays were used in some early computers. There reliability problems is one of the reasons solid state switching (transistors) was hailed as such a breakthrough. It is also important to remember I referred to a 74C73. The CMOS IC uses almost zero current. It's 100 microamp rating is at it's maximum frequency. CMOS uses almost zero current when in a quiescent state.
Eric Thompson S/V Procrastinator South San Francisco [EMAIL PROTECTED] ----- Original Message ----- From: "Ken James" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Thursday, July 31, 2008 12:38 AM Subject: Re: [Liveaboard] Latching relay control > > > Eric T. wrote: >> Ken, >> Four relays to control a latching relay. > > Only three. > > >> It may work, for some time, but I promise a well protected 74C73 would >> be >> more reliable. > > Could be. But then again, about the only fragile > part of this are the tiny points of the reed relay > and as long as they never see too much current, it > should last just fine. > > > The absolute requirement that there be zero > current when not >> in use is something I just do not understand. > > Well, (shrug), it wasn't me that put forth the > requirements, <G>. > > Even if a voltage regulator >> chip was used to provide additional protection > > I would think that as well as either zeners or TVS > protection would come close to making the 7473 or > any other IC just about bulletproof. > > But then again, when lightning hit the shop a few > years ago, the only vehicle still running in the > parking lot was my old privative Datsun. -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
