Circuit diagrams for radio amateurs

In the above circuit diagram, a CMOS operational amplifier (op-amp) controls the current via a P-Channel HEXFET power transistor (IRF9520)...

Antenna "ORION-5/8" mass-produced DM is working with the base radio citizen's band 27 MHz. The main advantage of this antenna...

The simplicity of a traditional die makes it exceptionally difficult to create a fully equivalent electronic version, if only because...

Often only complain about the lack of necessary materials for the manufacture of antennas. How do you solve the problem...