How-To Geek

Repurpose Old Phones As Intercoms

If you’ve got some old wired telephones laying around for want of a project, this simple hack turns two wired phones into an intercom.

Over at Hack A Day, Caleb Kraft shares his simple phone hack inspired by his VW bus. He writes:

In case you haven’t noticed from my many comments on the subject, I drive a VW bus. It is a 1976 Westfalia camper with sage green paint and green plaid upholstery. I absolutely love it and so does the rest of my family. We go for drives in the country as well as camping regularly. We have found that the kids have a hard time communicating with us while we’re going higher speeds. These things aren’t the quietest automobiles in the world. 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.

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. This hack is extremely easy, fairly cheap, and can be done in just a few minutes. The result is a functional intercom that you could use pretty much anywhere!

For more pics of his setup (and a neat video of his rather retro ride), check out the link below.

Using Old Phones as an Intercom [Hack A Day]

Jason Fitzpatrick is a warranty-voiding DIYer who spends his days cracking opening cases and wrestling with code so you don't have to. If it can be modded, optimized, repurposed, or torn apart for fun he's interested (and probably already at the workbench taking it apart). You can follow him on if you'd like.

  • Published 06/13/12

Comments (2)

  1. Paul Clifford

    I actually did this same thing (without the VW bus) several years ago for a cheap production intercom system. It worked well enough that a director, and three camera people could talk for about four hours. I built the actual circuit, but used cordless phones and headsets. The result was great and almost as good as the professional, multi-thousand $$ solution.

  2. r

    …very funky stuff. Peace & love to all my brothers a sisters.

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