Posted by PJH on February 10, 2010 at 10:28:30 from (71.171.243.234):
In Reply to: Barn phone ? posted by J.Wondergem on February 10, 2010 at 05:50:58:
My son and I rigged up a two phone intercom between his house and shop. It was powered by a wall wart power supply. Had to add a couple capacitors and a zener diode, and each phone had a piezo buzzer added for a "ringer". Pick up one phone and the piezo's on both phones would buzz. Pick up phone #2 to answer, and buzzers would shut off. It's been working for about five years. Got the schematic off of the internet. He's a phone tech and we enjoyed getting it working.
It's been my experience that I usually can't hear a phone ring in the shop if anything is running. Not even my cell phone on my belt. And sometimes I ignore it when I do hear it. My wife hits the horn button on her key fob if I don't answer the cell for dinner. (Car is 100' from the shop)
I have to wonder why you don't just use your cell phone and forget the land lines. You may have a weak signal inside your metal buildings. I have marginal signal in my shop.
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