Found in an old Elektor, this circuit uses two 7-segment displays to indicate the volume of an amplifier. The circuit uses components that are still common today.
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...