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Old 6th January 2007, 12:49 AM   #1
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Default Uni directional mic - help needed

Hi everybody;

I never saw any uni directional mic construction and desided to build one to pick up acoustic guitar sound.

I took a copper tube 1/2 inch diameter, 12 inch length, glued an electret mic from one side. The result was sawl-like frequency curve, however it was very directional. I decided to damp resonances and drilled some holes. Teeth became less sharp, frequencies shifted up, but it lost sharp direction pattern.

What I did wrong? Everything?

How do people build uni directional microphones without comb-filter effects, with flat frequency response?

Here is my project:

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