This circuit was obtained in Linear Technology documentation from 1993. The circuit provides 3.3 V and 5 V outputs with high current. The integrated circuit is from the time.
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...