This circuit is from a 1968 Electronic Design. The components are from the era and the operating frequency is 60 MHz. No data on the coils is provided.
Found in an old American publication, this article is suitable for incandescent lamps. SCRs can be of...
A bargraph or mobile bar indicator with 4 LEDs can be implemented by connecting the 4093 NAND...
This is an improved version of the previous circuit also found in the December 1990 Radio...