This is the smallest useful voltage regulator you can build: a resistor, a Zener diode, and something to power. It is not accurate and it is not efficient, and it will teach you more about regulation than any explanation, because you can watch the output move as you change the load. What you will build … Read more
Almost every diode is destroyed if you exceed its reverse voltage rating. A Zener diode is the exception: it is built to spend its working life in exactly that region, holding the voltage across it at a chosen level while current flows through it. That single inversion is what makes it useful, and it is … Read more
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