🚀 go-pugleaf

For a friend's mechanical engineering project I needed a circuit that
latched.  I built a circuit using two SPDT relays in which power through
one coil closed a switch which energized the second coil which closed a
switch which energized the first coil, or something like that :-)  Kinda
like an RS latch.  This worked fine for my application, except there was
a condition where if the wrong switch was closed, the system would
oscillate.

Does a simple device exist which does this sort of thing?  (ie. Is there
a better way to build a circuit with memory?  (perhaps with transistors))
I didn't want to use a 7474 for simplicity and power supply reasons.
 
At the time, I looked at some of the "latching relays" I had heard about.
These apparently have two coils, and a pulse to one coil latches the 
switch one way, while a pulse to the other coil latches the switch in the
other state.  This wouldn't have been useful to my application.

Alan Nishioka            atn@cory.berkeley.edu            ...!ucbvax!atn%cory