video circuit for sculpture - Electronic Circuits Projects Diagrams Free

dan r · 24th March 2003, 04:15 PM

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

**kinjalgp** · 24th March 2003, 04:48 PM

I think this is what you want:

bogdanfirst · 24th March 2003, 06:49 PM

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....

Sebi · 24th March 2003, 07:43 PM

For video signals switching i recommend TEA2114.

**kinjalgp** · 25th March 2003, 02:15 AM

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

bogdanfirst · 25th March 2003, 04:06 PM

very true!

Phasor · 26th March 2003, 06:47 AM

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** · 26th March 2003, 05:07 PM

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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24th March 2003, 04:15 PM	(permalink)
dan r	video circuit for sculpture 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

24th March 2003, 06:49 PM	(permalink)
bogdanfirst	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....

24th March 2003, 07:43 PM	(permalink)
Sebi	For video signals switching i recommend TEA2114.

25th March 2003, 02:15 AM	(permalink)
kinjalgp	I think SEBI's idea would be better since the relay circuit will generate noise during changeovers which is annoying. __________________ "There is no way to peace, peace is the way!"

25th March 2003, 04:06 PM	(permalink)
bogdanfirst	very true!

26th March 2003, 06:47 AM	(permalink)
Phasor	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?

26th March 2003, 05:07 PM	(permalink)
kinjalgp	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. __________________ "There is no way to peace, peace is the way!"