Found in a 90s Electronic Design, this circuit operates with Maxim components of the time. The circuit operates at 50 MHz with a 10 V x 50 mA current.
Found in a 1965 Radio Shack documentation this oscillator can be used with modern general purpose...
In the figure we have the way to use a single control voltage to act on two varicaps...
Found in a 90s documentation, this switch that is also sensitive enough to operate capacitively uses...