This circuit makes use of a stroboscopic tube, a component that no longer exists today. The circuit is from the 70's and can be adapted to use mains voltage.
This source can supply currents up to 1 A. The circuit is from Motorola's 1993 Linear Interface ICs....
The presented circuit uses a window comparator to keep a relay activated only when the sensor is...
The SCR sector of this circuit can be powered by high voltage AC and instead of the LEDs we can...