This circuit is from a 1977 Radio Shack manual. The photocell is an LDR and the operational one is a 741. Components with non-standard values can be approximated.
Found in an Analog Devices documentation from the 90s, this circuit uses a component of the time,...
Found in a 1969 documentation, this circuit is reset by a push button. The activation time is 100...
With the CMOS circuit shown, rectangular signals up to a few megahertz can have their frequency divided...