slow_rider
New Member
I need to control two latching relays using a single momentary SPST switch. Can anyone recomend a good & cheap way to do this? Maybe a DPST logic IC that can be controlled using the SPST switch?
Thanks!
Thanks!
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I agree, some details were skipped!
I don't have an exact relay model but we are talking about signal type relays with a 4.5V or maybe 5V coils with a low current draw, 1 coil latching.
Both coils should switch at the same time, and your description is accurate, I want a single push of the SPST tactile to latch them and the second one to unlatch them.
I thought about this a little bit and I remember something called a multiplexer from logic class in university but I admit I forgot almost everything by now but maybe something like that could assist here?
Are you talking about an SR flip-flop?
I took a second look on the FF, and if I'm not mistaking a JK-FF could be used for this function.
I can hook J & K HI, when clicking on the tactile, CP will be set HI so Q(t+1) = Q-bar(t=0)
Hooking up Q to the relay will give positive voltage when I click, negative on the next and so on...
Is this correct?
Thanks for the help! Only one more question... any usefull links about how to actually build a JK-FF? Do they come in IC packages?
With leftyretro's relay (5V/28mA, DPDT), I think this circuit will work. I've combined circuits that I've seen, but have not bench tested it. The paralleled outputs are to get enough current drive for the relay.
Ken