Using a pair of period A/D converters, this 3-digit circuit was found in the 1992 Radio Electronics Experimenter magazine. The sensor is a thermistor.
This circuit is from a 1996 publication, but it can be assembled with several equivalent...
This conventional Hartley oscillator circuit with an audio output transformer was found in a...
The oscillator in the figure has its frequency determined by the crystal. The indicated value is...