2-pin microphone used in Speech recognition circuit

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All microphones have (at least) two connections - the one in that circuit is a standard electret type. The second connection is the 'chassis' of the insert, for screening purposes.
 
Sorry! but I don't get what you mean with 'the second connection is the 'chassis' of the insert'.

How should I connect the insert/plug of the microphone to the circuit ?
 
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Post a picture of your specific mike, and we'll show you.

EDIT: Have a look at the bottom of this page for an example:

**broken link removed**
 
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