The circuit shown is from the 1994 Linear Applications Handbook by National Semiconductor. Some of the components are not currently common and should be looked for equivalents.
This circuit allows the frequency generated by an oscillator with the 4069 to be divided by two,...
This simple alarm circuit was found in the May 1990 issue of Radio Electronics magazine. The...
The LM358 integrated circuit used as a driver in this circuit is not very common today. The...