This circuit was found in a British documentation from 1969. It can be implemented with modern transistors. The pass band is 6 MHz.
The CMOS 4046 integrated circuit is not very common today, consisting of a very efficient PLL for...
This old circuit is suitable for signaling applications. The lamp must be incandescent, and the...
In the figure we show how the half wave rectification of a signal can be done using an operational...