[Kevin Darrah] wanted to make a simple 3.3V regulator without using an integrated circuit. He wound up using two common NPN transistors and 4 1K resistors. The circuit isn’t going to beat out a ...

Zuker also points out “the behavior of the mouse is independent of learning, experience, or context,” indicating that the thirst-regulating circuit is hard-wired into the brain. Mingyu Ye, another ...