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Thinking on starting an electronics/3d printing project:
Build my own solder fume extractor.
Got already a spare 4wire cpu fan which you can control the rotation speed with PWM.
Start thinking... "Right, gonna buy some PWM chips to start thinkering and learn about it, but how can I measure the pulses? With an oscilloscope of course." Start googling and the hard realisation arrives that this tiny project can run to couple hundred euros to do a simple thing. Bleh.

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