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.
Obtained from a 1980s Linear Technology documentation, this circuit has a hysteresis of less than...
This grid-isolated sensor was proposed by General Electric in 1966 documentation. The circuit...
This simple circuit can be used to power a simple communication system using ordinary telephones....