This oscillator produces a modulated signal using a unijunction transistor. We found it in an American documentation from 1965. The circuit modulates in frequency the generated signal.
This traditional amplifier configuration is from the National Semiconductor's Linear Applications Handbook...
We found this circuit in a Radio Electronics from February 1966. The circuit uses a germanium...
This circuit originally appeared in a publication of 1997. With the changes, the circuit can be...