Jim Spath
I don't know what this device is other than sort of a doorknob; the C cells expired in 2013. What is up with C17? It's only connected on one side maybe.
#Electronics
#LooseEnds
Feb 25 at 2:36amWeb
Show threadBob BeakerFeb 25

@jspath55 I'd guess it's the receiver for a wireless doorbell or similar.

The unconnected lead on C17 forms the antenna for wireless reception.

Doorbell or lock can be determined by what's on the end of the red & yellow wires.

Show threadJim SpathFeb 25
@bbeaker Appreciated! I was thinking antenna but had never seen one like that.
I think there is a speaker beneath; haven't unscrewed the board yet.
There was probably a push button in the same "junk" drawer.
#MightNeedThatSomeDay
Show threadPhilSalkieMar 14

@jspath55
At a guess, wireless doorbell transmitter?

C17 is an antenna.