“Previously I made a DC motor Speed Controller, the design was good but it could be used with only 12 V motors. Soon I needed to control 24 V motors, so I had to come up with a design I can use for the work. I saw it would be easy to use a 7812 with the 555 or a zener, but I wanted something very versatile, then decided to use lm317 as a voltage regulator.”
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