David Clark M-7/DC Electret Microphone Communications How It Works:

How It Works:

Soft Cloth Helmet Protective Bag

Can be fitted with a captive nut for use with a wire boom

Adjustable Comfort Liner Kit

The Pilot Communications PA-5B Electret Microphone is a replacement aviation electret noise-canceling microphone

David Clark M-7/DC Electret Microphone Communications How It Works:The M 7 DC Electret is a noise cancelling microphone designed to operate in place of carbon and amplified dynamic microphones. The microphone provides clear, crisp voice transmission while dramatically reducing omni directional ambient noise. It will not operate in circuits that do not supply a DC bias voltage. Most modern aviation communications equipment do supply this required voltage. It is intended for use with wire booms.