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video circuit for sculpture

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dan r

New Member
hello all, i need help designing a *very* simple circuit.

i'm building a sculpture in which there is a TV hooked up to two
NTSC video sources. I need to switch between them using a momentary
switch, so that touching the switch flips to the other video source and STAYS there(until you hit it again OR hit another momentary switch).

there could be two switches- one to switch and one to 'reset' to the original source. they both must be momentary so you can see the need for a controller board. any really simple ideas? using relays maybe? i can't quite figure this out.

dan
 

bogdanfirst

New Member
i thing it would be better to use a cd4013 because you can have a switch as the one you have as well as a set and reset switch....
 

kinjalgp

Active Member
I think SEBI's idea would be better since the relay circuit will generate noise during changeovers which is annoying.
 

Phasor

Member
On the other hand, dan r did say "a *very* simple circuit". Maybe noise isn't an issue, in which case the relay idea is better. Dan, what's your thoughts?
 

kinjalgp

Active Member
I forgot to put free-wheeling diodes across the relay coil. Don't forget to connect them in reverse (cathode facing +12V) to protect digital ICs from large transients generated by relay coil.
 
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