a crimp bottle-top at 100 mma one-inch magnetic ball at 150 mma hand approaching at 200 mm, andmoving shadows at many metres
Then my circuit failed and my power-pack went up in smoke. OBSERVATION: My absolute worst-case was when I powered up a high-voltage circuit, and a flash shot across my (expensive) breadboard, killing my (more expensive) oscillloscope. Happily, the design was finally published. It was the World Lamp.
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