Suggested by General Electric in a 1967 publication, this circuit makes use of an SCR of the time. The supply voltage is 110 V. The resistor R1 is to ensure the SCR holding current.

Suggested by General Electric in a 1967 publication, this circuit makes use of an SCR of the time. The supply voltage is 110 V. The resistor R1 is to ensure the SCR holding current.