This circuit was found in the August 1994 issue of Electronics Now magazine. The 4046 is uncommon these days and the frequency range is given by C1.
This circuit switches on an external load after a certain interval given by the capacitor. The...
We found this circuit in a 1998 documentation. It senses the passage of people or objects through an...
Based on the well-known LM3914, this circuit has a transistorized and inverters stage, triggering...