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 uses the 7493 to divide a TTL square signal by 8. The circuit must be powered from a...
This circuit uses a feedback integrator. We found it in Ferranti's transistor manual from 1974....
Found in a Popular Electronics from the 9s, this circuit has output for RS-232 interfaces and current...