1-cycle-per-30-day oscillator (CB26073E)

This extremely slow circuit produces one pulse per month and can be used in a timer. We found it in the November 1998 Electronics Now magazine.

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Tone dialers (CB9468E)
These circuits were found in Exar documentation from the 90s. The circuits use both a small...
4 LEDs Flasher (CB16325E)
This is the project was found in a 1982 publication. As shown in the figure, these are two...
Window Comparator (CB10627E)
This circuit is from a Popular Electronics from 1993. The magazine is no longer printed, but the...