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Handset speaker | by mightyohm
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Handset speaker

I'm not sure what the black thing does. It is a DC open so I left it in the circuit.

 

It might be a transient suppressor to keep lightning strikes on the phone line from killing the unlucky person on the phone at the time.

 

mightyohm.com/blog/2008/11/bluetooth-handset-hack/

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Taken on November 16, 2008