This circuit was found in a Popular Electronics documentation from the 90s. It is possible to switch the frequency of an oscillator by voltage. The circuit can act as a shield.
We found this circuit in a 1976 documentation. The circuit uses a double gate MOSFET. The circuit...
We found this circuit in a Popular Electronics of the 90s. Its purpose is to detect when it locks...
Carbon microphones are no longer used in most projects. However, finding one in the scrap metal, it...