Found in ancient documentation, this circuit uses a high voltage transistor of the time. Observe the supply voltage of the neon lamp used.
This configuration shows the simple way to use a varicap diode to tune an LC circuit. Capacitor C1 must be...
This circuit can generate signals up to a few tens of megahertz depending on the frequency of the...
We found this circuit in a 1998 documentation. It senses the passage of people or objects through an...