D 2012-12-04T11:45:43.966
L P2Dgizmo
P 755dfda390cef1ea1dfed962eb47809ab6b6a4fc
U jfk
W 875
[/wikiedit?name=P2Dgizmo|Edit this page] (Login required)
<h2>About</h2>
P2Dgizmo stands for Pulse to DTMF gizmo.

It is a device which teaches a Plain Old Telephone to "sing" modern DTMF.<br>
The original ZIP-file can be downloaded [http://truecard.biz/temp/PulseToTone_2012_01_22.zip|here], and the author also has a demo video available on [http://www.youtube.com/watch?v=ZLoQ5UA1tvc|youtube]

[Notes] -:- [Software] -:- [Usage]

<h3>Schematics</h3>
<b>Note: the schematics as shown below will not work on European telephone lines.<br>
because European telephone lines do a polarity switch at the end of each call.<br>
(This might be solved with a bridge-rectifier though)<br>
</b><br>
(Click on the image below to get a bigger picture)<br>
<a href="../P2D/doc/tip/Schematic_v1-0.png"><img src="/doc/tip/Schematic_v1-0.png" width="800" height="600" /></a>

Z 20b94ed42f293f3d046c1174509dc454