Electret Condenser Microphone Cartridge, Mic Element Various, Cardioid and Omni

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Electret Condenser Microphone Cartridge, Mic Element Various, Cardioid and Omni

Electret Condenser Microphone Cartridge, Mic Element Various Types

Various Condenser Microphone CartridgesWM-55A103 Microphone Factory Packaging

WM-61A Panasonic Factory Pack

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 output impedance. 

WM-55A103 specifies a 680 Ohm resistor at 1.5V supply voltage, though you can go for higher voltages in an attempt to get lower noise. 
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 typical.  

Panasonic WM-61A Datasheet

Panasonic WM-55A103 Datasheet

Generic 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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