This circuit is suggested by General Electric in 1966 documentation. The Triac must match the engine. The resistors depend on the triac's sensitivity to firing.
Found in Radio Electronics from the 90s, this circuit has several outputs with different pulse...
This second-order filter was found in American documentation and can be applied to almost any...
This traditional configuration with the 555 was obtained in an 80s Hands-On Electronics. The relay...