This circuit is better than the previous one in that the control is isolated by a transformer. The transformer has 110 or 220 V primary and 6.3 to 12 V secondary with 200 to 500 mA current.
This circuit was found in old documentation. The SCR can be any of the 106 family. Note the sensor...
This common circuit using a multivibrator causes two lamps to alternately flash at a frequency and active...
Found in an Electronic Design and 1970s, this circuit uses transistors of the time. The...