Using a sensor from the time, this circuit was found in the 1992 Radio Electronics Handbook magazine. The circuit uses a pair of integrated two-digit A/D converters.
This is a typical RF oscillator configuration found in a 1980s documentation. The frequency...
The purpose of this circuit is to detect output signals from a transmitter for the frequency range...
We found this circuit in a Japanese 1968’s documentation. The circuit makes use of transistors from...