This circuit was found in a 80s American documentation. The zener diodes determine the points of action of each stage and the transistors can be general purpose types.
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...