The original application of this 1967 Ferranti circuit can be changed so that it functions as a pass sensor shield for gears and other moving objects.
This circuit is from a specialized documentation in 1992 FETs. The L1 coil has 0.07 uH with...
Texas Instruments MSP-EXP432P401R LaunchPad Development Kit enables you to develop...
This General Electric circuit is from the 80's. The PUTs used in this meter are not common...