Found in an American publication from the 1980s, this circuit can be found in commercial sound equipment of the time. The list with the component values is given next to the diagram.
This small AM transmitter was found in American documentation from the 1980s. Transistor support...
We found this circuit in a 90's Popular Electronics. The circuit produces a loud sound if S2 is...
This circuit is suggested by National Semiconductor and is based on an LM1578-A integrated circuit...