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special app single pulse lock/unlock


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frascati 
Member - Posts: 3
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Joined: May 31, 2008
Posted: June 07, 2008 at 12:06 PM / IP Logged  
special app single pulse lock/unlock -- posted image.
I don't understand how the latching relay (top one?) can reset? It is a single coil relay and there is nothing in the diagram that indicates that the switch is capable of delivering a pulse of different polarity.
There must be a second switch therefore, no?   I guess I'm confused by the range of meaning with "single pulse" "single switch" "impulse" etc.
I'm trying to find a purely electromechanical way of using a single momentary switch to operate a latching dpdt relay. Seems like it should be doable with no more than three relays, but I can't get the logic straight. There is a Magnecraft 711 series relay, but it's just too physically bulky for my use.
I'm trying not to have to resort to using a little barrel push solenoid connected to a little latching dpdt pushswitch, but it may come down to that.
the12volt 
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Joined: March 07, 2002
Location: Louisiana, United States
Posted: June 07, 2008 at 12:31 PM / IP Logged  
The top relays works similar to a ball point pen. Inside the relay is a mechanical latch that catches or releases each time the coil is energized closing or opening the contact with the common terminal.
special app single pulse lock/unlock -- posted image. the12volt • Support the12volt.com
frascati 
Member - Posts: 3
Member spacespace
Joined: May 31, 2008
Posted: June 07, 2008 at 2:11 PM / IP Logged  
then that relay must be the size of the magnecraft 711?
I have searched e v e r y w h e r e for a solid week now. I've asked dozens of experts, engineers, and salespeople if a relay with a ratching mechanism for allowing it to use the same polarity per operation existed in a pcb version. They all said no. I looked through google for two days straight. Still nothing.   The one photograped in that circuit..
special app single pulse lock/unlock -- posted image.
is a pcb mountable relay.   If you can tell me where to purchase this you will be my hero! (I'm not being sarcastic. this experience has been that frustrating!)
frascati 
Member - Posts: 3
Member spacespace
Joined: May 31, 2008
Posted: June 07, 2008 at 7:27 PM / IP Logged  
Please get back to me on this. I'm sincerely begging you.   I'm going nuts here.
the12volt 
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Joined: March 07, 2002
Location: Louisiana, United States
Posted: June 07, 2008 at 7:33 PM / IP Logged  
I purchased the last few from Pelican Electronics in Metairie, LA many years ago. When I get back in town, I'll be happy to check with my suppliers for the relay shown in the picture. BTW, I know that I have at least one left as it is the one in the picture.
special app single pulse lock/unlock -- posted image. the12volt • Support the12volt.com
i am an idiot 
Platinum - Posts: 13,693
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the12volt 
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Joined: March 07, 2002
Location: Louisiana, United States
Posted: June 07, 2008 at 11:33 PM / IP Logged  
Thanks idiot ;)
special app single pulse lock/unlock -- posted image. the12volt • Support the12volt.com
i am an idiot 
Platinum - Posts: 13,693
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: June 08, 2008 at 12:20 AM / IP Logged  
You're Welcome, but I felt as though I HAD to help him out. I could hear the stress in his typing.
frascati wrote:
Please get back to me on this. I'm sincerely begging you.   I'm going nuts here.

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