This circuit comes from a 1966 NASA documentation. The circuit makes use of discrete components and is suitable for generate 455 kHz IF signals.
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...