Electronics > Beginners

Why does this LED blink?

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BravoV:
And if you clip both probes at the LED's 100 Ohm resistor, before and after, use scope's math function, you can see the LED current, ideal for adjusting the cap size.

mikerj:

--- Quote from: Lucky-Luka on February 19, 2020, 07:29:25 pm ---I was expecting to see the blue trace in the attached image at the positive leg of the LED.

--- End quote ---

Your trace shows exactly what I would expect to see across the LED.  The blue trace is the current through the resistor, this is explained on the website you linked to


--- Quote --- The current wavform, which is the voltage drop across the 100 Ohm resistor, is shown in the blue trace on the scope image
--- End quote ---

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