I then modeled up an enclosure for the circuits, along with a hotshoe with contacts. This circuit takes in the ~300V trigger voltage and turns it into a 5V for the camera’s hotshoe. You can find the PCB and 3D files on my GitHub. I instead designed and ordered a PCB based on this schematic (the webpage has a really good explanation of how the circuit works). Note: Some older cameras would be fine with this voltage because they have physical trigger contacts, but a newer camera would definitely get damaged. However, wiring the trigger directly to the hotshoe would cause a couple of hundred volts to pass through the camera, frying it. It should be wired up to the camera’s hotshoe so that the flash will trigger exactly when the photo is taken. The trigger switch was a bit more complicated, however. For the charging switch, I simply attached a toggle switch up to it. There are two switches in the circuit: one to charge the cap and one to trigger the flash.
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