Using a common crystal diode and a 741, this circuit can be used to detect microwaves. The circuit is from old documentation and the switch selects the gains.
An way to change the frequency of the previous oscillator (CIR112E) is to add a variable capacitor in the...
From an input signal, and using an unusual current source, this circuit generates a ramp, that is, a...
This Intersil circuit was found in a 1980s documentation. Operational are of the time, but current...