Solar flashlight (CB20488E)

This circuit charges a battery to power a flashlight at night. The circuit is from an English publication from 1991.

Clock with comparator (CB9592E)
Found in old American documentation, this circuit can be implemented with modern operational...
Keyboard Hexadecimal Encoder (CB13763E)
We found this CMOS circuit in a 1978 publication. It allows you to use a standard calculator...
Diode Test (MSB064E)
This configuration is used to display the characteristic curve of a diode in the virtual...