Lightning Detector with Coherer
thingiverse
This is a simple lightning detector that uses a coherer. When a radio frequency signal is received and its magnitude is great enough to trigger the coherer into conduction, a current flows through transistor that amplifies the current for the counter relay. When the relay takes a step forward, the hammer tap on the coherer's tube. This "knock" returned the metal powder back to their low-conductance state. https://www.youtube.com/watch?v=lEYOqLs_vWU
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