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 digital clock has a traditional configuration with well-known CMOS integrated circuits. The...
Operational amplifiers used in this 80's circuit is not very common today, but the setting can be...
This 3-digit thermometer, suggested by Texas Instruments, uses 3 integrated plus the display, with...