This harmonic oscillator controlled by crystal was found in an American documentation of the 90's. The circuit uses transistors of the time. Current equivalents can be used.
Found in documentation from the 1990s, this circuit converts 12 V to 9 V from a car's power...
We found this circuit in a 1969 General Electric documentation. The circuit uses transistors of the...
This voltage doubler is indicated for applications where a voltage equal to twice that applied at the...