Found in a 1964 Electronic Design, this circuit makes use of period components. The components are from the time, and modern equivalents can be used.
This circuit was found in a 1970's Radio Electronics. The pulse transformer has a 1: 1 turn ratio....
This common circuit with two transistors was found in an old French publication. The supply can be...
Found in American documentation from the 90s, this circuit has a timing system for activating the...