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Morse Code Touch Keyer/Autocoder

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Step 4: The P3 Touch Keyer Kit

Picture of The P3 Touch Keyer Kit

This is a very easy kit and if you have done much soldiering, you should knock it out in 10 minutes after the part identification phase.  The connections to the PCB are pretty straightforward as well.  Power in from the 9 volt battery via a switch, inputs from the two keys which can be anything metal such as homebrew paddles or pennies like I used.  To mount the pennies, I drilled a hole in the center of the penny and stuck a piece of 22 ga. solid hookup wire through, soldered it and then ground it smooth with a Dremel.  This way the hole through the enclosure can be directly underneath the penny.  Since this thing works by your body capacitance, it is important to keep the wires connecting the pennies (or whatever) as short as possible.  The outputs consist of the dit, dah and ground.  I wired these to a 3.5 mm stereo audio jack in the front of the enclosure as well as the power (from switch) to a 2.1 mm DC power jack.

 
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