I only found this video recently but it's excellent. I've never seen a radio engineer go thru the circuit component by component and explain how it's working at this level of detail. He has several other videos all worth watching but this one is really something special. If you've never seen someone make a resistor with paper and a wood dowel this is a must-watch.
Direct Link: https://www.youtube.com/watch?v=U6ZVqr0fPo4
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