1-quadrant logarithmic converter (CB7333E)

This temperature compensated circuit was found in a Popular Electronics from the 90s. Integrated circuits and transistors are from that time.

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Window Comparator I (CB24973E)
Using the CA3140 in the figure we have a comparator that goes low in the window voltage space. The...
Two-wire comparator (CB25192E)
With this circuit it is possible to connect a comparator to a power stage via two wires. The...
LED Flasher 4069 or 74C04 (CB24586E)
This simple circuit was found in the May 1979 issue of Radio Electronics magazine. The circuit has the...