Convert SPST (on/off only 2 contacts) switch to short a pair of conductors for 3-5 seconds when “switched” on and off

Dblaise 10 months ago

12 volt DC supply power for circuit/device.

on state to press button”short” circuit

off state to press button “short” circuit

each time for 3 to 5 seconds

Thanks in advance!

Dave

0 shabaz 10 months ago

You've not provided the all-important information (your use-case, and what circuit is being controlled), which means suggestions can't be optimal.
I suspect you're trying to control on/off a device that has a push-button that needs to be held down for a period.

You may as well use a cheap microcontroller for this, because it's likely some other requirement will come up once you try it. if that was the scenario, for instance, you may wish to check the device actaully did power up or shut down, and that would then need some code changes.
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0 Dblaise 10 months ago

you are correct that I am controlling a device that requires the button be “held” to turn it on and off.

I do not require any “feedback” from the circuit or device as to the state of the device it is controlling
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0 shabaz 10 months ago in reply to Dblaise

How will you guarantee that the on and off states on each side are in sync?
Is it just going to be a hope that is the case?
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0 geralds 10 months ago

try this circuit:

use the D-FF e.g. CD4013, which you can use with 12V.

a datasheet

ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fcd4013b
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0 Dblaise 10 months ago in reply to shabaz

Won’t be possible… you are correct
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