Effective contact relays for High-Risk Applications
Reliable contact relays Styles for Industrial and Industrial Applications
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I have a small camera that starts recording with the touch of a button then stops by touching the same button. I would like to build a circuit that would momentarily close the contact of that button to start recording then at a predetermined time (30 seconds) close the contacts again to stop recording. I plan on triggering this circuit with an opticoupler on a higher voltage separate circuit. Any idea of how this can be done. I can solder leads directly on the contacts of the camera.
And got the following answer:
I'd use a reed relay across the contacts unless you can check the circuitry to see that you could use a transistor or opto. But either way, you could do this with a series of LM555 circuit. initial start pulse would produce a short pulse (perhaps 0.5 sec) to start the camera, as well as starting the second 555 timer, which times out after 30 seconds. the end of this would trigger the third 555 which produces the 0.5 sec stop pulse.
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