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Finding a component that suits your needs at the right price
An explanation of the E-series and why those funny values are used.
Calibrating your finger for more accurate subjective assesments.
A simple (if not absolutely accurate description) of how a normal transistor operates
For situations when your microcontroller (or whatever) can't do it on its own.
A simple inroduction to heatsinking components
How to take a good closeup image with your phone
A list of common anwers and links to useful documentation on driving LEDs.
Tips for beginners on long duration timers.