push button switch to lock / unlock doors

Using the latching relay above and one SPDT, here's how you can use a single pulse to supply two negative outputs to lock and unlock your doors.

the12volt • Support the12volt.com

Hi MCubed45, you're welcome. I'm pretty sure the one I use changes when it's released, but I'll have to double check it on the bench when I get the chance, however not all latching relays are the same and are available in "different flavors". Some you will have to reverse polarity across the coil to reset it and others may have a separate coil to reset it and will change while energized. Obviously for your application you'll want to use one with a single coil not dependant on polarity to set and reset, but these may also vary in the way they change from set to reset. One thing I would suggest is adding a momentary switch to trigger the latching relay that will allow you to change from set/reset as needed just as a backup feature in case it ever gets out of sink.

the12volt • Support the12volt.com

wow, thanks for the info, i will get down to my local maplin (UK version of radio shack) and get a latching relay sorted out, ive got a few of the other relays kicking around the garage and will rig this up on the bench this weekend.

thanks once again for the help and info

daz

hey 12volt, how can you tell exactly what type of latching relay it is?  like on the hosfelt page you reffered me to, there's 3 latching relays.  which of those would suit my application (single coil not dependant on polarity).

http://www.hosfelt.com/en-us/dept_111.html

thanks for all your help! 

Actually you can't tell from the information there unless you are familiar with the manufacturer's part numbers or have a pin layout to view, but I found one that will work for you here: http://www.elipse.be/dol/dol.htm It's the last one shown on the page. Also check with your local electronics suppliers or repair shops.

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