In this installment of Circuit VR, we’ll look at a simple buck converter — that ... LED drop is pretty constant over a wide range. A Zener diode can work too but isn’t good for power ...

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 programmable Zener diode pulled ...