This high-impedance headphone circuit was found in a 1990s William Sheets. The power is low, but the high input impedance makes it useful for radio applications.
This circuit can also be used as a shield if the excitation is made with 5 V and the output stage...
This type of sensor was used in sensitive infrared systems from the 1960s. This circuit was found...
We find this circuit in a documentation for engineers from 1971. The circuit generates rectangular and...