Employing a unijunction and a triac of the era, this 1964 Electronic Design circuit uses a diac to trigger the Triac.
This high quality circuit with complementary symmetry was found in an Electronics World of 1966....
Found in a 1991 publication this circuit can be assembled with more modern components. We can use...
This circuit was found in a 90s Electronic Design. The integrated circuits are from that time....