This circuit is from 1964 documentation but can be easily implemented based on current components. Input waveforms and detection are shown next to the diagram.
This circuit controls a heating element with voltage from 6 to 30 V and current up to 3 A from...
Found in a 1967 General Electric SCR manual, this circuit can be used to protect a load by...
This filter was found in Radio Electronics, and its configuration can be applied to any...