This circuit was found in a Signetics documentation from the 1980s. Next to the figure are the waveforms of the generated signals. The transistor admits equivalent.
Operating at a frequency of around 180 kHz, this transmitter was found in a Science & Electronics...
This circuit in the National Semiconductor Fast IC Power Transistor manual uses a special power...
Varactor diodes are our varicaps of today. This circuit for switching signals in an RF circuit was found...