Found in a 90's EDN, this circuit generates signals in the frequency range given by the graph. The circuit requires a symmetrical power supply.
Found in a 90s 303 Circuits, this circuit uses the KTY10 sensor, widely used at the time. | Clique na...
This high-impedance headphone circuit was found in a 1990s William Sheets. The power is low, but...
We found this protection circuit for the power supply in a 1992 documentation. This circuit has...