Electronics Gurus...question

[zippy]

Do you know of an electronic switch that has two states, on and off, which, when voltage is applied for a second, will switch to on (or off) and stay that way until voltage is applied again?

I need this for a project where a circuit will be connected for a tiny amount of time but I need to keep the circuit connected.

Thanks.

EDIT: If you know any way to do this besides this (mythical?) switch, let me know!

 

[911paramedic]

might be stupid, but isn't that a relay switch???

 

[zippy]

<shrug>

If you're thinking of a single-switch, double-throw relay...that won't work. That kind of relay would get voltage for a tiny amount of time, switch to On or Off for a tiny amount of time and therefore only connect the circuit for a tiny amount of time.

 

[Blundar]

use a flip flop and a relay (or optoisolator) combined
flip flops are solid state, but they will not switch any real current

 

[Rickr]

I think you are talking about a "Flip-flop" circuit, which can be created with two NOR gates.

 

[OZEE]

The circuit you're looking for is called a "t flip-flop" If you need to use relays, I could come up with the latching logic necessary to accomplish this... If you need it, pm me

 

[zippy]

The last two people who posted...can I get some more info on that?

Thanks.

 

[ScottMac]

...a "MonoStable Multivibrator" or "Bi-Stable MultiVibrator' I believe.
(a "Flip-Flop" circuit).

Then drive something like an SCR or Triac, a Silicone Controlled Switch, or a relay.

It's been a while, but that's my recollection.


Scott

 

[zippy]

<< ...a "MonoStable Multivibrator" or "Bi-Stable MultiVibrator' I believe.
(a "Flip-Flop" circuit).

Then drive something like an SCR or Triac, a Silicone Controlled Switch, or a relay.

It's been a while, but that's my recollection.


Scott >>

Sooooo lost...

Can anyone give me more info on this stuff? I'm not an EE major (not even in college yet) that just forgot what something was.

 

[OZEE]

Link 1
Link 2

These are only a couple of links... lotsa links came up when I searched for "t flip-flop" on Google. These particular links show schematics of the electronics, logic states, etc.