Long times with DI3T1 (CB21422E)

This PUT circuit was found in a 1967 General Electric SCR manual. The basic component is unusual, and the capacitor must be low-leakage.

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Home Security System (CB4868E)
This control panel allows the use of NO and NC sensors, turning the alarm on after 30 seconds...
Lamp Cruiser effect (CB17321E)
This circuit, found in a 1989 publication, only works with incandescent lamps. The maximum power...
Battery Charger (CB6394E)
We found this circuit in a 1968 Electronics World. The potentiometer should be set to trigger the SCR...