switching circuit

rfarn · 11th June 2008, 10:49 PM

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 · 11th June 2008, 10:55 PM

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

rfarn · 11th June 2008, 11:13 PM

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 · 11th June 2008, 11:57 PM

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 · 14th June 2008, 05:26 AM

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

dave_gerecke · 14th June 2008, 01:42 PM

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 · 14th June 2008, 02:03 PM

there are a few latching switch circuits in the Forum.

11th June 2008, 10:49 PM	#1
rfarn diyAudio Member Join Date: Oct 2005	switching circuit 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

14th June 2008, 02:03 PM	#7
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	there are a few latching switch circuits in the Forum. __________________ regards Andrew T.

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11th June 2008, 10:55 PM	#2
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	A relay? http://en.wikipedia.org/wiki/Relay

11th June 2008, 11:13 PM	#3
rfarn diyAudio Member Join Date: Oct 2005	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.

11th June 2008, 11:57 PM	#4
dave_gerecke diyAudio Member Join Date: Dec 2007 Location: Vermont	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

14th June 2008, 05:26 AM	#5
rfarn diyAudio Member Join Date: Oct 2005	That might work. Just looking for a simple A/B switch to change sources on a sterio.

14th June 2008, 01:42 PM	#6
dave_gerecke diyAudio Member Join Date: Dec 2007 Location: Vermont	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

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