![]() With a switch I can select the mike or the ‘normal’ input. ![]() The schematic (made by Joost, PE1RCD) can be downloaded here.įor easy use I added a electret microphone and mount it in the back of the enclosure. After that, the frequency range was from 580-1200 Hz, much more in common to a CW signal.Īdded to the decoder was a key function with a 4060 side-tone generator and a LM386N amplifier. So a changed the resistor in series with the 22K potmeter from 3K3 to 10K. I found that the range was from 800-3300 Hz which I find to large. The program worked fine but the Tone tune was very small. The audio signal varies the 2.5V on the analog input of the arduino. ![]() I tested it with an Arduino program called ‘cw_foxhunt’ which you can find here. Another disadvantage is that you interrupt the loudspeaker. I liked the project and built it in a home made enclosure made from PCB. In the VERON magazine of November 2015 there was a description of a CW Morse decoder built around an Arduino Nano.
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