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 excellent wireless microphone circuit for the varicap-modulated FM band came out in...
The simple low voltage source that can be used as a battery eliminator, shown in the figure was...
This asymmetrical crossover filter was obtained from an 80s integrated circuit manual. The...