In fact, when you throw away a single-use camera, if there is a flash unit you also throw it.
That's regrettable because this part is still in order of use and is rarely recycled.
There is the flash unit in itself and a battery, and this battery is full in most cases as we don't use the flash for each photo taken.
So let's do something nice and (re-)useful.
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Signing UpStep 1Gather material
-1- old single-use cameras, the more is the best.
you can have this for free in most Photographer's Shop, you just have to ask them. That's what I do: Monday "hello can you keep those cameras for me" and a week later I have a full box of them.
-2- wire.
-3- relays.
-4- capacitors.
-5- a power supply for your relays
-6- your usual tools.
and that's almost all.
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For the contacts between wires A and B to trigger the flash, the current is very low; it essentially commutes a tension more than a current.