This 1968 Texas Instruments circuit uses diacs of the era. SCRs can be modern equivalents according to the controlled load.
We found this circuit in a 90s Radio Electronics. The secondary current of the 110 or 220 V...
This circuit is from an April 2000 Poptronics. The magazine no longer exists, but the circuit can...
This circuit is from a 90s American documentation. The circuit can use complementary pairs...