We found this circuit in the March 1999 issue of Electronics Now magazine. The indicator used is an analog type. The values indicated depend on the calibration.
This circuit is from 1987 documentation. The operating system used is not common today, but two...
This transmitter for modulated infrared remote control was found in documentation from the 90s....
This commercial receiver was sold in the 1960s in Japan. It is a 6-transistor superheterodyne...