[Kevin Darrah] wanted to make a simple 3.3V regulator without ... a roughly 8V breakdown voltage. Essentially, this transistor is being used as a poor-quality Zener diode. At normal temperatures ...
The main circuit is powered by your ... to the cathode of a TL431 programmable Zener diode pulled from an old scrapped TV. The diode is referenced to a voltage divider, and voila!
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