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Some D-Cerno units have a fixed microphone. This microphone has a unidirectional response for optimum performance even in noisy conditions, and has a very low susceptibility to interference from mobile phones.

Electrical and acoustic properties



Transducer type Back electret (condenser)
Operating principle Pressure gradient
Polar pattern Unidirectional, cardioid
Frequency response 130 Hz – 15000 Hz
Nominal impedance 1kOhm (at 1 kHz, drop resistance = 1k2, Vdd = 3.3VDC )
Load impedance > 5kOhm
Max. SPL at 1 kHz 120 dB SPL

Free field sensitivity

7mV/Pa, +/- 3 dB at 1 kHz or (-43dB, 0dB=1V/Pa at 1kHz)

Power supply

3.3V DC, 0.5 mA

Consumption 0.5 mA (without LED ring); max. 25 mA (with illuminated ring)

Creation date: 01/10/2019 10:24 (b.maertens@televic.com)      Updated: 16/10/2019 13:43 (b.maertens@televic.com)