This circuit was found in a 1970 US publication. Transistors are still common and the circuit can be used as a PWM shield or pulse transmission modulator.
This circuit was obtained in a 90s Popular Electronics. In the table the values of the components...
May 2017 - Mouser Electronics is already in stock with the new BCP1395 transistors from Nexperia....
Found in a 1967 Electronics World, this circuit can use any modern equivalent FET. Observe the...