This circuit operates at a voltage of 1.3 V from a single mercury cell. We found in an old documentation and for the components used the frequency is 500 kHz.
This circuit was found in an application note of the LTC1164 from Linear Technology of the 1990s....
This micropower inverter serves to obtain high voltages with very low current from direct current...
This circuit shows how to get 5 V under low current from an operating amplifier 741. I got this...