This optical tachometer with LASCR was found in a 1965 General Electric documentation. The diode at the input is an unusual type today.
The output of this circuit can be a crystal phone or a piezoelectric capsule. The circuit tests the...
The use of a detector bridge instead of a single diode, as is normally done in common galena...
April 2017 - TDK chip-on-ceramic components can be obtained from Mouser Electronics for 2.4 GHz...