Are you done for the night? Not if you’ve watched [0033mer]’s Simple Electronic Circuit Hacks video! You know just what to do. The ground pin of a LM7805 connects to the cathode of a TL431 ...
Zeros from the third band of the resistor (the multiplier) can be added behind these numbers, eg 100 becomes 1,000 (× 10), 330 becomes 33,000 (× 100), etc. E12 resistors have a tolerance of 10 ...