Of course, the current is extremely small, but a voltage of 300 V can be obtained from 9 V of a battery. The circuit is from an Electronics Now of May 1994. C1 adjusts the operating point.
This oscillator with the 4049 can generate signals up to about 14 MHz according to the article in the...
We found this circuit with very high input resistance in an old documentation. The circuit is still...
From an audio signal, this circuit gets two signals of the same amplitude and opposite phases....