When approached by a circuit that operates with RF signals, this circuit captures them by activating the indicator instrument. The circuit operates over a wide frequency range.
This circuit from an old Argentine publication shows how it is possible to use a tunnel diode in a...
In the figure we have a basic PLL circuit with the LM567 or equivalent. The circuit is from a 1977...
This basic Schmitt trigger was found in an American publication from 1968. The circuit uses...