OpAmp as a voltage regulator

I was trying to understand the above schematic, which came from the LT342L service manual. It’s the circuit that drives the 2.5 and 3.3v rails on the main (cpu) board. I was confused as to why an opamp was used here, rather than a voltage regulator, and exactly how the circuit was working. So I …

Bending Piezo Actuator

I’ve been playing around with these Piezo actuators which come from pantpiezo (model number QDTE52-7.0-0.77-1). Bendable Piezo actuators offer deflection in the millimeter range at low force. The ones I have appear to be bimorphic so you need to apply an opposite voltage to each side. The video below is with a 100v supply, current …