The capacitor is to stop stray DC current from passing through. Note: My understanding of this circuit is that audio from a cw source enters as AC current. You will notice that I twisted the audio connector wires in the final version. This is an idea of how the audio input module will look after it is all constructed. (6) Add heat shrink tubing over the sleeve wire connection. (5) Consider twisting the wires together for neatness sake. (4) Solder a 10″ length of wire to the posterior sleeve area of the TRS jack. (3) Use heat shrink tubing to cover the initial wire to the tip. Check for continuity with tip, and no continuity with the ring or sleeve. (2) Solder about 10 inches of hookup wire onto the appropriate posterior part of the TRS jack that is in continuity with the tip. (1) Remove TRS jack from a dead pair of headphones, or acquire the jack in some other way.
Wire components on breadboard and arduino.Heat gun (optional) or other method of heat shrinking like a hair dryer.
There are no shortages of internet sources for these projects however.īelow is the overall schematic for my version of Hjalmar OZ1JHM’s design. The internet search engines led me to these instructions by Hjalmar Hansen OZ1JHM and this video on the “learnelectronics” youtube channel. How tough would it be to build a morse code decoder? Or otherwise known as a cw (for continuous wave) decoder for the ham radio operators out there. While following the tutorial and watching my inspirational messages such “Hello World” and “I like pizza” transfer from the desktop arduino IDE to the the little screen, the first independent break out project that I wanted to build popped in my mind. The 48th video in Paul McWhorter’s youtube series on arduinos interfaced with an LCD display. As I mentioned on here before, I have been studying both the arduino and electronic circuits.
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