This circuit was found in a Popular Electronics from the 90's. The transistors are general-purpose types and the loaded load depends on the voltage and must have a maximum current of 100 mA.
The oscillator in the figure has its frequency determined by the crystal. The indicated value is...
We found this circuit in an old RF documentation. The circuit must employ RF transistors and the...
This circuit was found in a documentation from the 70s. The FET admits current equivalents and the...