The software from Chat-Cord to be able to control Skype with your normal telephone keys ( www.chat-cord.com/downloads.htm ) works perfect with the circuitry, meaning that you can make and accept calls with your normal phone (not necessary to be at the pc when you make or accept a call). The only thing you need to do is to assign shortcut keys in Skype to your different contact persons, so you can call them with that number. Actually all this software does is to convert the DTMF signals from you phone (the different bleeps) to numbers , # and *. I’ve tried the circuit with four different phones normal wireless, DECT, and wired and it all works perfect. You have a little bit of crosstalk between speaker and microphone (you hear yourself talking) but this is normal in telephony and it can be decreased with the volume control setting of your microphone (make sure you turn off the mic. boost). |
So, let go through the steps in building one of these. I’m going to use a 9v battery as this is more ‘fool proof’, but if you’re confident that you know what you’re doing then go ahead an use power from the USB port. This can either be build on a circuit board (like on the pictures) or like a bird nest. A bird nest means that you solder the wires directly on to each other and it doesn’t look as good, but for a small project like this it should do fine.
If you want to use an USB cable as power source then cut it off and strip down the wires. You will have red, back, white, green and a shield. Cut of white and green as we won’t be using them. Red is +5v and black is ground. The shield can also be cut off, or if the transformer has a metal casing then you can connect it there. This would provide some extra shielding. |
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The following parts are needed for the circuit and the amounts I paid for it are as follows
9V battery | €1.50 |
600 Ohm – 600 Ohm 1:1 transformer secondary centre tapped | €2.50 |
150 Ohm resistor | €0.10 |
Stereo jack cable (cut it in half to be used as mic and speaker plug) |
€2.00 |
Print board 5x5cm | €0.50 |
€6.60
|
Good luck!!
And have fun Skyping all around the house…
For questions you can reach me at: mr_blond18@hotmail.com
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