2-pin microphone used in Speech recognition circuit

[playmaker]

Hi! I am building the a speech recognition circuit using HM2007. The schematics is at this site:

How to Build a Speech Recognition Circuit Page 2

All of the microphones I know have 1 pin. This circuit requires a 2-pin microphone. Do you know where can I find it ?

Thank you very much!

 

[Nigel Goodwin]

Hi! I am building the a speech recognition circuit using HM2007. The schematics is at this site:

How to Build a Speech Recognition Circuit Page 2

All of the microphones I know have 1 pin. This circuit requires a 2-pin microphone. Do you know where can I find it ?

Thank you very much!

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.

 

[playmaker]

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 ?

 

[Nigel Goodwin]

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**