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The video below offers a good explanation of the CW tuning process and will provide good insight into the Zerobeat process.
https://www.youtube.com/watch?v=8Dxx-N2CVPI
Here is a kit that provides an external “SON OF ZEROBEAT” detector.
https://www.youtube.com/watch?v=hIPiCmpwJu0
The colored LEDs add to the effect….
Note that there is also a somewhat more refined version of the circuit called “GRANDFATHER OF ZEROBEAT”
Enjoy 😉
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