Remote control tester (CB7823E)

This circuit from a 90s Electronics Now, uses a 4010 gate as a signal amplifier. The circuit triggers an indicator LED.

Fast Inverter CA3080 (CB25136E)
This comparator circuit was found in the May 1988 Radio Electronics magazine; The power supply does...
Infrared Obstacle Detector (CB17183E)
This infrared “radar” was found in a 2000 documentation. Its range varies between 20 cm and 1...
Astable NAND CMOS I (CB19538E)
This is the normal configuration of a stable or CMOS oscillator with NAND gates. This...