This dual-LED circuit indicates three signal levels. It was found in the January 1996 issue of Electronics Now magazine. The integrated circuit may be an LM339 or another comparator.
This stage for JFETs was found in a 1965 US publication, but is valid for modern components. |...
Have you not yet memorized the color code used to identify resistors and capacitors? Do you have...
The transistors in this circuit from an English publication in 1980 may be the BC548. Operational...