If a photo-camera is used to digitize a film the camera should be triggered on the correct time point to take a picture of one positive of the film. Triggering the camera 16 times a second would follow the film projector running at 16 Hz (pictures/second). By using a magnet and a Hall sensor this trigger pulse can be easily generated. This trigger print holds all the electronics needed to generate a trigger pulse to trigger a photo-camera.
The PCB starts with some AC to DC conversion (PCB can also be driven by DC), a small powersupply, a Hall sensor (at the bottom-side of the PCB) , a LED to show the status of the Hall sensor and an output stage to trigger the camera. Every projector is different and to prevent creating a lot of different board’s, it was decided to create only one PCB and use metal strips to position the board of the right spot).
A cinch (jack) connector can be used for the trigger cable. Shielded audio cable can be used to transport the trigger signal. Connections for the trigger output are H3 & H4.
The size of the pcb is only 33 * 14.5 mm
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