This very low current circuit was found in the April 1995 Electronics Now magazine. The frequency should be chosen for maximum efficiency according to the small transformer used.
This circuit makes use of a specific 80's component and was found in an American manual of the...
The circuit shown in the figure, generates a positive pulse whose duration depends on C1, from the...
We found this circuit on the internet. The components are current, and the time depends on C1...