While doing this project, I expected it to be mildly amusing. However, since you’re not using the black and yellow wires, you could theoretically rig up a circuit with a buzzer that would run off the normal 12V. If you want it to ring, you’re going to have to come up with a slightly different circuit. This circuit allows both ends to be picked up and audio to be transmitted either way. #VINTAGE LINE POWERED DESKTOP INTERCOM SYSTEMS PORTABLE#A single 680 ohm resistor should let you use the 12V directly from your car or even a standard 9V battery if you’re wanting to make this portable (in a treehouse for example). You can see in the picture below, all you really need is a little bit of spare phone cable (or a spare junction box), a resistor, and a power source. The circuit to make two phones work as an intercom is extremely simple. The result is a functional intercom that you could use pretty much anywhere! This hack is extremely easy, fairly cheap, and can be done in just a few minutes. I decided to employ a really old hack to put two functional telephones in the bus so my kids can talk to my wife (or whoever the passenger is) without screaming quite so loud. Pushing this bread loaf shaped hunk of steel down the road with an engine that might top out at 75hp results in wind noise, engine noise, and of course, vibration. These things aren’t the quietest automobiles in the world. We have found that the kids have a hard time communicating with us while we’re going higher speeds. We go for drives in the country as well as camping regularly. I absolutely love it and so does the rest of my family. It is a 1976 Westfalia camper with sage green paint and green plaid upholstery. In case you haven’t noticed from my many comments on the subject, I drive a VW bus.
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