Found in a 1967 Electronics World, this circuit can use any modern equivalent FET. Observe the amplitude of the input and output signals.
This short-range transmitter has the frequency determined by the crystal. The frequency can be...
September 2017 - Semtech's proximity sensors SX9310 with Specific Absorption Rate (SAR) can be...
This circuit was found in a 90s Electronic Design. It uses integrated circuits that are not common...