switching circuit

[rfarn]

I'm looking for a simple switching circuit which, when power is supplied momentarily, an "electronic" switch would be closed.

I.E. An electronic version of a basic switch which is closed by momentarily applying power and stays closed after the power is removed. Idealy, there would be a second signal which would open the switch.

Thanks

 

[darkfenriz]

A relay?
http://en.wikipedia.org/wiki/Relay

 

[rfarn]

Kind of. A relay only closes when there is power supplied. Looking for one that will "change state" when power is supplied, and keep that state (opened/closed) when the power is removed. Also looking for a strictly electronic, not electro-mechanical solution.

 

[dave_gerecke]

Hello rfarn, what kind of voltage and current capacity are you looking for? If it is low you could probably use a regular momentary contact switch with a flip-flop. The flip-flop, per its name will switch output states when it gets an input pulse. Usually they work off of logic voltages, 5vdc (TTL), 3vdc (LVTTL).

Peace,

Dave

 

[rfarn]

That might work. Just looking for a simple A/B switch to change sources on a sterio.

 

[dave_gerecke]

Hello rfarn, the flip-flop would work for providing a latching control signal, but you would still need relays to actually switch the audio signal. In the application you are suggesting, reed relays would work.

Peace,

Dave

 

[AndrewT]

there are a few latching switch circuits in the Forum.