Found in an old Radio Electronics, this circuit applies to frequency meters for frequencies up to 100 MHz. The input impedance is in the order of 1 M ohm.
The circuit shown in the figure is quite interesting in control and alarm applications. This...
Based on 74HC digital circuits, this circuit generates signals in three phases. The frequency...
This double-beat oscillator was found in American documentation from the 1970s. FETs admit...