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Convert sound signal to dry contact signal? Answered

This might be a bit of a strange question, so will try and word it so someone can follow along.

I posted a thread previous about getting my doorbell chime to work with SmartThings.  What I now have is a sensor with external input.  The keep it simple, there inputs are GRND and IN.  When the 2 inputs are joined, the device reads CLOSED and when they are apart, the device reads OPEN...perfect.

I've been trying to find a point on my Chimes circuit board that would create a dry contact between 2 points to trigger the sensor, but I'm not having a great deal of joy.

There are however, 2 wires running from the board to a speaker in the unit.  Is there anyway I can get convert the signal to the speakers into a signal which would connect the 2 wires?

I know a speaker is an electromagnet that responds to electric signals, but wasn't sure if there was something preventing the contact being made between the 2 sensor wires

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Downunder35m

3 years ago

This point was also answered in your last topic ;)

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K20EvoDownunder35m

Reply 3 years ago

Completely missed that - what a muppet! Is there a certain type of transistor I need, and what other electronics are required? Just need to know what parts to pick up

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Downunder35mK20Evo

Reply 3 years ago

You have a few thausand transistors to pick from, basically any will do.
Might be a hit and miss to find the right way to connect it to the speaker and add a timer but there is plenty of info on timers and basic transistor circuits on the web.
The transistor only need to be able to "switch" once to start the timer and all is reset when done.