This circuit was found in Radio Electronics from the 90s. It converts capacitance into frequency in order to obtain a proportional voltage that can be measured in a common multimeter.
August 2017 - Mouser Electronics is in stock with the PGA460 and PGA460 Q1 ultrasonic processors...
This simple standing waveform (ROE or SWR) meter is used to adjust antenna matching with...
This linear scale circuit can use the current scale of a multimeter instead of the 50 uA...