Original Contents of  file notes.txt as contained in file "Pulse2Tone_2012_01_22.zip"<br>
(Hyperlinks added by JvK)
(The PDF-file only contains a picture, which is directly stored as JPG in this repository)

<pre>
main.c - source code
main.h - header file
<a - adapter schematic
<a - phone schematic

Source code compiled with AVR Studio v4.18 + WinAVR for attiny45, optimization -O1.
SUT_CKSEL fuse should be programmed for external 8 Mhz crystal oscillator.

The converter originally designed to be mounted/wired inside the phone.

It has to be connected in parallel to the phone line, but _after_ the hook switch, e.g. between terminals C and F/RR on the phone schematic.

Rotary dial (all 4 wires) has to be disconnected from the phone and wired to the adapter (see schematic).

<b>The adapter is polarity sensitive.</b>

Terminal C is just a solder pad, so I ended up using L2 instead (its a nice screw terminal).
</pre>
<b>End of notes</b>