All About Circuits

Free electrical engineering textbooks plus a reference library covering everything from Ohm's law to op-amp design. Better organized than most university course material.

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DigiKey

The component search that actually works — parametric filtering, datasheets inline, and reliable stock. The reference standard for sourcing parts when you need something specific.

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Limor Fried built the gold standard for maker electronics — tutorials that actually teach you why something works, components you can trust, and a community that welcomes beginners without dumbing things down.

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SparkFun

The other pillar of maker electronics. Strong on tutorials for getting hardware talking to each other, and their breakout boards save hours of low-level wiring work.

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