Electronics > Beginners
Why does this LED blink?
Lucky-Luka:
Hi all
I've tried to replicate the circuit mentioned here:
http://cappels.org/dproj/simplest_LED_flasher/Simplest_LED_Flasher_Circuit.html
I've obtained different traces on the scope.
I have to say that I have a slightly bigger cap (470uF).
I am a beginner so maybe I haven't set the scope properly however I notice a different trace regarding the voltage across the LED. I've seen several examples online and they obtain a precise shape: that's not the one I have obtained.
Any suggestions?
Cheers
Zero999:
The oscilloscope trace looks good, but you forgot to include the LED and where the probes are connected, in the schematic.
Lucky-Luka:
The yellow trace is related to the positive leg of the capacitor while the red trace is related to the positive leg of the LED.
james_s:
The waveforms look reasonable to me. What are you expecting to see on the scope?
The LED is not in your schematic at all, where is it connected?
Lucky-Luka:
ops you're right! :palm:
I was expecting to see the blue trace in the attached image at the positive leg of the LED.
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