I need a part but dont know wtf its called... - Tilted Forum Project - TFP - Sexuality, Philosophy and Political Discussion

urbandev · 05-01-2005, 11:24 PM

I need something like a relay that has 2 positions...

when circuit #1 is connected the switch will be to position #1 even after its disconnected.

when #2 is connected it will switch and stay same as before...any idea where i could aquire this device?
and wtf it is called?

urbandev · 05-01-2005, 11:24 PM

or how to build one?

flat5 · 05-02-2005, 06:36 AM

sounds like a latching relay

also a

bistable flip flop circuit

skaven · 05-02-2005, 09:59 PM

I think flat5 is right on both accounts. If you're dealing with high-current, 12V-ish signals, then you want a latching relay circuit. If you're dealing with digital stuff (CMOS, TTL logic, etc) then you want a bistable flip flop circuit.

Here's a latching relay circuit I whipped up...this is probably what you're looking for:

<a href="http://www.djskaven.com/~skaven/yatta/latching.jpg"><img src="http://www.djskaven.com/~skaven/yatta/latching_t.jpg"></a>
Clicky for bigness

skaven · 05-02-2005, 10:29 PM

Note that my circuit assumes that you always have power. If you were in "circuit #2" mode and power to the coil was lost, the system switches back to "circuit #1". If you're looking for something that switches permanently even after power loss...I'm sure there's something out there that does that, but I can't think of one off the top of my head. I can imagine how to construct one out of a flap of steel and a couple electromagnets though...

flat5 · 05-03-2005, 04:02 AM

Yes Skaven, I too had the impression that some latching relays are mechanically bi-stable.
Maybe have a magnet and and two electro-magnets? or a 2 spring system?
Or your bent metal idea.

Perhaps I'm dreaming :-)

urbandev · 06-13-2005, 01:55 AM

Latching Relay did the trick, Thanks guys

05-01-2005, 11:24 PM	#1 (permalink)
urbandev Insane Join Date: Apr 2003 Location: Dayton, NV	I need a part but dont know wtf its called... I need something like a relay that has 2 positions... when circuit #1 is connected the switch will be to position #1 even after its disconnected. when #2 is connected it will switch and stay same as before...any idea where i could aquire this device? and wtf it is called? __________________ Raoul Duke: "I wouldn't dare go to sleep with you wandering around with a head full of acid, wanting to slice me up with that goddamn knife." Dr. Gonzo: "Who said anything about slicing you up, man. I just wanted to cut a little Z in your forehead."

05-01-2005, 11:24 PM	#2 (permalink)
urbandev Insane Join Date: Apr 2003 Location: Dayton, NV	or how to build one? __________________ Raoul Duke: "I wouldn't dare go to sleep with you wandering around with a head full of acid, wanting to slice me up with that goddamn knife." Dr. Gonzo: "Who said anything about slicing you up, man. I just wanted to cut a little Z in your forehead."

05-02-2005, 09:59 PM	#4 (permalink)
skaven Insane Join Date: May 2003 Location: Austin, TX	I think flat5 is right on both accounts. If you're dealing with high-current, 12V-ish signals, then you want a latching relay circuit. If you're dealing with digital stuff (CMOS, TTL logic, etc) then you want a bistable flip flop circuit. Here's a latching relay circuit I whipped up...this is probably what you're looking for: <a href="http://www.djskaven.com/~skaven/yatta/latching.jpg"><img src="http://www.djskaven.com/~skaven/yatta/latching_t.jpg"></a> Clicky for bigness Last edited by skaven; 05-02-2005 at 10:26 PM.

05-03-2005, 04:02 AM	#6 (permalink)
flat5 Junkie Join Date: Sep 2004 Location: Amsterdam, NL	Yes Skaven, I too had the impression that some latching relays are mechanically bi-stable. Maybe have a magnet and and two electro-magnets? or a 2 spring system? Or your bent metal idea. Perhaps I'm dreaming :-) Last edited by flat5; 05-03-2005 at 04:05 AM.

06-13-2005, 01:55 AM	#7 (permalink)
urbandev Insane Join Date: Apr 2003 Location: Dayton, NV	Latching Relay did the trick, Thanks guys __________________ Raoul Duke: "I wouldn't dare go to sleep with you wandering around with a head full of acid, wanting to slice me up with that goddamn knife." Dr. Gonzo: "Who said anything about slicing you up, man. I just wanted to cut a little Z in your forehead."

05-02-2005, 06:36 AM	#3 (permalink)
flat5 Junkie Join Date: Sep 2004 Location: Amsterdam, NL	sounds like a latching relay also a bistable flip flop circuit

05-02-2005, 10:29 PM	#5 (permalink)
skaven Insane Join Date: May 2003 Location: Austin, TX	Note that my circuit assumes that you always have power. If you were in "circuit #2" mode and power to the coil was lost, the system switches back to "circuit #1". If you're looking for something that switches permanently even after power loss...I'm sure there's something out there that does that, but I can't think of one off the top of my head. I can imagine how to construct one out of a flap of steel and a couple electromagnets though...