This heating element control with up to 3 kW was obtained from an old American documentation. SCRs must be load-compliant, and transistors can be current equivalents.
The XR220 is a circuit equivalent to the 555 of the 1970s. This configuration from Radio...
Found in an English publication from the 1960s, this circuit uses period components, including the...
This circuit was found in Linear Circuits Applications of Texas Instruments, originally using the...