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It’s the simplest semiconductor device made. It’s technology ushered in the age of radio. Say hello to the electronic valve that rectifies and regulates – the diode!

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As per usual, making this installment of the series taught me quite a few things. Prior to reading up on the diode, I wasn’t aware how closely its development was tied to the birth of radio – and just how finicky crystal detectors can be. I had a crystal demo in mind for this one, but it seems temperature and humidity hampered efforts to use my newly acquired galena samples. Oh well, more to come … Fortunately there is a good example of a DIY razorblade diode in Bre’s Foxhole Radio vid – good stuff.

And just in case you’ve missed any past installments of the MAKE presents vids, here they are in a big ol’ stack format -


MAKE presents: The Transistor


MAKE presents: The Capacitor


MAKE presents: The Resistor


MAKE presents: The LED

Collin Cunningham

Born, drew a lot, made video, made music on 4-track, then computer, more songwriting, met future wife, went to art school for video major, made websites, toured in a band, worked as web media tech, discovered electronics, taught myself electronics, blogged about DIY electronics, made web videos about electronics and made music for them … and I still do!


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