This circuit was obtained from National Semiconductor documentation from the 1990s. The circuit has a passband of 300 kHz.
This is the well-known lightning lamp that was published in the March 1988 issue of Saber...
The CMOS 4046 integrated circuit is seldom used, both due to the difficulty of finding it and the...
What this circuit does is to detect when a signal reaches a certain value determined by the two...