Electret Condenser Microphone Cartridge, Mic Element Various Types
This is one item of new condenser microphone element of varying
type as shown in the variation pictures. WM-55A103 is a
directional cardioid type. WM-61A and the J60 generic omni
are omni-directional types. The WM-56A and the wired type
are no longer available. WM-55A103 and WM-61A are genuine
Panasonic types and I've shown the factory packaging and lot
codes in the secondary pictures.
There are links to the pdf datasheets for the Panasonic mics
below which cover typical electrical connections.
Generally you need a low noise d.c. supply voltage between 1.5V
and 10V and a bias resistor and d.c. blocking capacitor as
specified. The resistor and the microphone broadly set the
specifies a 680 Ohm resistor at 1.5V supply voltage, though
you can go for higher voltages in an attempt to get lower
WM-55A103 has less than 680 Ohm output impedance.
WM-61A specifies a 2.2K resistor at 2V supply voltage.
For the omni
generic type, a 2.2K bias resistor and 2V would be
Panasonic WM-61A Datasheet
Omni Microphone Data Sheet
You can use four of the cardioid types to make a three-dimensional
ambisonic surround-sound microphone, and the schematic there
shows an example of a half-decent low noise pre-amp circuit.
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