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

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