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Knowles EK3029c

    This is the microphone element recommended by Old Bird for recording night migrating thrushes, sparrows, and warblers. It is excellent for recording flight calls whose frequency is above 2 kHz, and note that the C1 capacitor is built in. The frequency response of the element can be seen on the Knowles Electronics EK series webpage. The element has a 12 dB per octave rolloff below 2 kHZ, thus greatly reducing rumble from wind, road, or aviation noise. High frequency sensitivity begins to drop off above 6 kHz but this is largely compensated for by the 6 dB gain in sensitivity from the dinner plate reflector.

    For connecting this mic element in the circuit diagram on the microphone design page, the black lead corresponds to ground, the red lead is the signal carrier, and the white lead goes directly to the resistor - the opposite side from the C2 capacitor.

(Warning: this microphone element will be damaged if it gets wet. It is advisable to experiment with a cheaper element (e.g., RadioShack versions) until you are confident that your implementation of the plastic food wrap seal is waterproof.)