wireless intercom

[flat5]

Thank you. We were not in the same grade. She was older than me and I was two years behind in school. We did swim together with two other kids.

I'm trying to think how I may have wired it a little differently because I don't think I reversed one set of batteries.

 

[dr pepper]

Just a slight diffrence in voltage between the 2 batteries is probably enough to make it work.

There is a farm shop near where I used to live that has a old phone in the farmshop (honesty box type shop) and it worked for a long time off a car battery, the 'cables' where the top and middle wire of a fence and ran back over 1/2 a mile to the farmhouse, worked a treat, I managed to get the phones to ring or should I say tinkle using the hook switches.

 

[flat5]

Just a couple of volts might allow communication and the buzzers are powered only by one end of the line. Interesting