Found in 1965s General Electric documentation, this circuit is intended for the control of servos connected to the power grid. Equivalent modern components can be employed.
For the 600 kHz range coil is formed by 35 turns of 28 AWG wire on a ferrite core with a diameter...
Found in a 1970’s documentation, this circuit uses components of the time, uncommon today. |...
This 2003 circuit uses two types of sensors: by reed-switch and by infrared. If the magnetic...