Found in an Electronic Design of 1964, this circuit operates with control voltages from 0 to 12 V determining the duration of the pulses.
September 2016 - It can be obtained from Mouser Electronics coils for inductive battery chargers...
Found in a 1993 Electronics Hobbyst Handbook, this circuit uses components that are still common...
This circuit can be implemented with other operational ones. We found it in documentation from the...