P2Dgizmo
Update of "P2Dgizmo"
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Overview

Artifact ID: 2f5b125a00b85c8e98aedf18abe486db5567e8ca
Page Name:P2Dgizmo
Date: 2012-12-02 23:05:41
Original User: jfk
Parent: e226a3792b52e35de4bafa27eb8fe696d80a0c3d
Content

About

P2Dgizmo stands for Pulse to DTMF gizmo.

It is a device which teaches a Plain Old Telephone to "sing" modern DTMF.
The original ZIP-file can be downloaded here, and the author also has a demo video available on youtube

Notes -:- Software

Schematics

Note: the schematics as shown below will not work on European telephone lines.
because these lines switch polarity at the end of each call.

(Click on the image below to get a bigger picture)