This circuit synchronized by the power grid can be used as a shield. We found it in an 80's Electronic Engineering. R1 can typically be 4k7.
This circuit provides an output voltage approximately 2 times that of the input voltage. The...
The operational amplifiers of this circuit can be replaced with more modern equivalents. The power...
We found this circuit in a 1964 publication. The circuit is both an amplifier and an oscillator for the...