Panasonic Condenser Microphone Cartridge (WM-60AT)

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The Panasonic Condenser Microphone Cartridge consists of a high voltage internal electret membrane, metal electrode and a field effect transistor (FET). Doesn't need a high-voltage bias from the outside like ordinary condenser microphones.

Features:

Highly efficient electrical specification, pressure type operating principle, low impedance (2.2 kOhm), omnidirectional back directivity, and a high degree of reliability under adverse shock, vibration and environmental tests.

Characteristics:

from spec sheet:
S/N ratio		> 58 dB
sensitivity		-44 +/- 5 dB @ 1kHz
impedance		< 2.2 kOhm
directivity		Omnidirectional
frequency resp.		20 - 20,000 Hz
max voltage		10 volts
nominal voltage		2 volts
current consumption		< 0.5 mA
price		~$2 each

Applications:

Telephone and telephone answering devices, tape recorders, intercoms, computer modems, completed microphones for recording, testing and monitoring, hearing aids, sonic controlled toys and sensors, and others. All buzzers and microphones are non-washable.

References:

• Panasonic Microphone page: http://www.panasonic.com/industrial_oem/communications/communications_audio_components_microphones.htm
  • Panasonic WM-60AT Condenser Micronphone spec sheet: [PDF]
• Available from Digikey as part number P9967-ND. Here is a catalog page from Digikey for the cartridge: [PDF].