This Hughes circuit is from 1968. Equivalent modern components can be used. The input impedance is 1000 M ohm.
Found in a Popular Electronics from the 90's, this circuit detects the approach of objects by the...
March 2017 - This new component of Vishay has a 16-bit resolution that allows it to be used in a...
This circuit indicates through LEDs when an automotive fuse is open. ...