I have collected a few telegraph sounders and my question is how to tell
what DC voltage to use based on the ohms. The 5 ohm and 30 ohm work fine
on a 3 volt battery but I have just picked up a 140 ohm sounder and have
no idea on how to find out the voltage needed to make it work as 3 volts
DC is not enough. Is there a way to find out this type of information as
I am only using a short piece of copper wire and dry cells attached to a
key and sounder. Any help apprreciated.

Tom

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