Found in an old American documentation this FM modulator makes use of a varactor diode. The circuit can be easily implemented given the small number of components used.
This circuit was found in documentation from the 50's. The circuit uses transistors of the time...
This power supply can provide 10 A currents. Its regulation is made by 7812 integrated circuit. The...
This is the traditional configuration of a 6 or 12 V source with 7806 or 7812 integrated circuits, for a...