Oil change computer (CB6373E)

This electrochemical circuit monitors the conductivity of the oil indicating when to change it. The circuit is from an 1967 American documentation.

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Reed Switch Alarm (CB885E)
Many reed switches can be wired in series to perform na efficient alarm as shoen in the figure....
5 kHz to 5 kHz Rectangular Generator (CB25326E)
This simple operational amplifier and dual source circuit was found in the March 1996 issue of...
Switching regulator (CB8168E)
Found in a Maxim documentation from the 90s, this circuit produces a voltage of 5 V from an input...