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.
We found this circuit in a 1969 Mullard documentation. The same configuration appears elsewhere in...
This receiver for an audio link by modulated light was found in a 90s Elektor. Transistors are common...
Found in a 1980s American documentation, this circuit inhibits ignition. The circuit is valid for...