We know that LED is a two terminal semiconductor device. It is used in most of the electronic circuits as a sign or visual representation to the normal human to know that circuit is working properly.

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Here is a VLF receiver tuned to 300 kHz designed to detect the crackle of approaching lightning. A bright lamp flashes in sychrony with the lightning bolts indicating the proximity and intensity of ...

If you are searching for a simple way to learn about electronics that requires no soldering and is delivered to your door on a monthly basis you may be interested in Crazy Circuits which take the form ...