This circuit was found in Radio Electronics from the 90s. The CMOS integrated circuit is a PLL not easy to obtain today. The output stage can be exchanged for another one with greater power.
The accuracy of this 3-digit digital capacitor meter depends on the tolerance of the components used and...
This volume control by direct voltage makes it possible to use a remote potentiometer to control the...
This circuit was found in a 1987 magazine. It consists of an oscillator controlled by the...