This General Electric circuit, in a documentation from the 1960s, allows the use of high resistance resistive sensors with unijunction transistors in a relaxation oscillator.
This simple standing waveform (ROE or SWR) meter is used to adjust antenna matching with...
This circuit measures the temperature through the voltage drop across a diode. The circuit was...
This circuit uses an unusual PLL, the 4046 CMOS. We found it in the October 1994 issue of...