This oscillator was found in a 1976 documentation. The no specified components indicate circuit timings in the range of 150 ns to 120 seconds. The supply must be made with 5 V.
Found in an October 1992 Radio Electronics magazine article, this circuit generates a low-power tone in...
In the figure we have the way to configure an OR gate using 3 gates of the 7400. The circuit is...
This circuit is basically the same configuration as the previous one with a power stage with...