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Wiki page [Notes] by jfk 2012-12-03 10:48:34.
D 2012-12-03T10:48:34.785
L Notes
P 02d929337b73b27ce8f368d6b5abbeb33cf75f64
U jfk
W 1151
Original Contents of  file notes.txt as contained in file [http://truecard.biz/temp/PulseToTone_2012_01_22.zip|"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)

main.c - source code
main.h - header file
<a href="../P2D/doc/tip/Schematic_v1-0.png">Schematic_v1-0.png</a> - adapter schematic
<a href="../P2D/doc/tip/phone_circuit.jpg">wd_we500c-d.pdf</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 (itÂ’s a nice screw terminal).
<b>End of notes</b>
Z e657c62bf8f5f47114dac8e0dbc17a3e