Step 4: 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.

<p>Hi, thanks for sharing this. With the code, what happens if you touch both right and left paddles at the same time? </p>
<p>Hello, jgeepers. Well, to be honest, I have never tried that, but I suspect that you would never be able to do this exactly simultaneously and the first penny touched would send and then the other.</p>
Okay thanks. I'm thinking about buying an Iamibic key like a Bencher but I don't want to spend $150+. Then I saw your build. I especially like this option that you noted http://www.cwtouchkeyer.com/P3W.htm<br><br>I'm realizing the cost isn't all tied up in the key. There's also the electronic keyer. I've built a practice oscillator from this design http://nt7s.com/2008/11/nt7s-code-practice-oscillator/ and I'm very happy with the sound. It's very clean. <br><br>I was able to hook up the practice oscillator to a basic stamp that I have, BUT I'm realizing if I want to merge the iambic key, my practice oscillator AND the basic stamp, I'm going to need the right code. Making the code simply produce &quot;dit&quot; and &quot;dah&quot; is no problem. I'm just wondering how the heck to produce the right sound if both keys are held down at the same time. I'm not super proficient at writing code!<br><br>Back to the drawing board...or I can simply give in a spend a couple hundred bucks and buy it all and start practicing morse code instead of spinning my wheels! lol!
Cool! <br> <br>-Doctordv <br>

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