Homebuilt relay computer

[Tony Duell]

> > With stnadard relays, you can make a latch with one relay (connect an NO
> > contact in series with the coil across the supply). You need to put a
> > break contact of some other relay in series with that so as to be able to
> > reset the latch
> 
> Or,  if there's any resistance in series with that coil,  couple a 

If there's sufficient resistance in series with the coil, you could even 
direcrly short-circuit the coil through the NO contact of another relay.

-tony