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pMic – A printable A-B-Stereo Microphone

pmic_unfolded

For anyone interested in DIY microphone building, Frank Piesik has open sourced his printable, compact stereo microphone (via createdigitalmusic.com) –

I wanted to have a mic which I could use for general purpose recording in conjunction with my old iriver h120 (with rockbox installed). I didn’t find a suitable mic without a build in recorder:)

So after a little bit googleing I found this article about a low-cost homebrew solution and decided to get a bunch of these panasonic wm61-capsules described in the article to start experimenting with them – here is the result.

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A special feature of this microphone is it’s variable stereo width (by time-of-arrival stereophony).

The button near the audio jack is the on/off-switch, the second one a gain boost. By swapping two resistors in the circuit, the gain boost could be easily converted to a gain damp. The preamp circuit isn’t necessary at all, if your recorders preamp has phantom power. But the 9v battery increases the headroom for louder signals and powers the 4 capsules more convenient. The distance between capsules and preamp shoud be as short as possible.

Check out Frank Piesik’s blog for some audio examples and links to the printable file to make one yourself!



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