This circuit was found in a Popular Electronics from the 90s. The counter circuit is not common today. The circuit can be programmed for hourly intervals, according to the values of R4 and C2.
This constant current source is from the LM11's own factory manual used in the application. The circuit is...
This circuit, from a 1988 documentation, consists of an automatic temperature control using an NTC...
With this name we already published an interesting game. For readers who do not know, this game...