Analog Signal to fire Contact Closure

jvamos · 27th March 2012, 08:59 PM

Hello all,

I'm new to the forum and was hoping someone could help me with a fairly basic first project.

I have a video streamer which fires wipes across a television screen. I am looking to find a simple project board I can assemble to take an analog line level signal (1kHz Tone) and fire a contact closure or relay. The streamer has two terminals simply marked GND Trigger and after jumping it with a paper clip I am reasonably satisfied it's a contact closure. When I attached it to an unbalanced output on my audio interface it just would continually fire wipes.

I know a simple device should cost too much or be too difficult to solder together. I am not sure what voltage I am dealing with. Any guidance in the right direction would appreciated as right now I am lost on wikipedia.

Thank you!

Josh Vamos

simon7000 · 27th March 2012, 09:14 PM

use a 4n32. Connect one end of a 1,000 ohm resistor to the center pin of the audio out. The other end of the resistor goes to pin 1. Pin 2 goes to the shell of the audio out connector. You can ignore the ring contact. Pin 5 goes to trigger and pin 4 goes to ground.

http://www.vishay.com/docs/81865/4n32.pdf

jvamos · 27th March 2012, 09:46 PM

Thank you very much for your input!

Is this along the lines of what you meant?

Thanks!

Josh

jvamos · 28th March 2012, 12:45 PM

Quote:

Originally Posted by jvamos

Thank you very much for your input!

Is this along the lines of what you meant?

Thanks!

Josh

I am not the best at sketching things up.

simon7000 · 28th March 2012, 01:34 PM

Yes, you can test the circuit with a battery for input. 9V would be fine. (+ to resistor) If it doesn't trigger switch the sweep terminal connections.

AndrewT · 28th March 2012, 04:24 PM

esp did a couple of projects using analogue as trigger input.

jvamos · 28th March 2012, 04:49 PM

Hey thanks! I'll search for posts by ESP

On another note just got back from my local electronic hobby shop and they only had the 4n31 and the 4n37 and 4n38.
Are those a suitable substitutes?

Thanks!

Josh

jvamos · 28th March 2012, 05:22 PM

Quote:

Originally Posted by simon7000

Yes, you can test the circuit with a battery for input. 9V would be fine. (+ to resistor) If it doesn't trigger switch the sweep terminal connections.

How does one SWEEP a connection?

The ESP circuit seems like it would work but I would need to modify it to remove the delay. I only want the switch open when a short audio signal is sent out. Also having it trigger on every cycle would not be ideal.

Not really sure how to go about wiring this more involved board. Anyone make ESPs circuit?

jvamos · 11th April 2012, 07:02 PM

Hey Simon 7000 the just got the part. Going to pick up the resistor and the project box with a board...

Will report back.

27th March 2012, 08:59 PM	#1
jvamos diyAudio Member Join Date: Mar 2012	Analog Signal to fire Contact Closure Hello all, I'm new to the forum and was hoping someone could help me with a fairly basic first project. I have a video streamer which fires wipes across a television screen. I am looking to find a simple project board I can assemble to take an analog line level signal (1kHz Tone) and fire a contact closure or relay. The streamer has two terminals simply marked GND Trigger and after jumping it with a paper clip I am reasonably satisfied it's a contact closure. When I attached it to an unbalanced output on my audio interface it just would continually fire wipes. I know a simple device should cost too much or be too difficult to solder together. I am not sure what voltage I am dealing with. Any guidance in the right direction would appreciated as right now I am lost on wikipedia. Thank you! Josh Vamos

28th March 2012, 04:49 PM	#7
jvamos diyAudio Member Join Date: Mar 2012	ESP Projects Hey thanks! I'll search for posts by ESP On another note just got back from my local electronic hobby shop and they only had the 4n31 and the 4n37 and 4n38. Are those a suitable substitutes? Thanks! Josh

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27th March 2012, 09:14 PM	#2
simon7000 diyAudio Member Join Date: Nov 2008 Location: Oakmont PA	use a 4n32. Connect one end of a 1,000 ohm resistor to the center pin of the audio out. The other end of the resistor goes to pin 1. Pin 2 goes to the shell of the audio out connector. You can ignore the ring contact. Pin 5 goes to trigger and pin 4 goes to ground. http://www.vishay.com/docs/81865/4n32.pdf

28th March 2012, 01:34 PM	#5
simon7000 diyAudio Member Join Date: Nov 2008 Location: Oakmont PA	Yes, you can test the circuit with a battery for input. 9V would be fine. (+ to resistor) If it doesn't trigger switch the sweep terminal connections.

28th March 2012, 04:24 PM	#6
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	esp did a couple of projects using analogue as trigger input.

11th April 2012, 07:02 PM	#9
jvamos diyAudio Member Join Date: Mar 2012	Hey Simon 7000 the just got the part. Going to pick up the resistor and the project box with a board... Will report back.