How-To Build a Telephone Recording Circuit from an Old Modem

We started out with an old modem and ended up with a useful circuit to convert phone audio to regular line audio. This little hack is useful for those of us wanting to record Voip telephone calls for podcasts with good quality audio. Keep in mind that recording telephone calls without notifying all parties involved is against the law in many parts of the world.

What you’ll need:
- an old modem with an audio transformer
- a soldering iron
- a throughhole circuit board
- a computer with mini jack audio in (and a Griffin iMic for older macs)
- an extra telephone cable

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