I have an electronic engineer friend of mine in the final stages of building a laser-beam shutter release mechanism for my Deardorf 8x10. He's on the home stretch but has no idea about the polarity of the charge in order to activate it. There's nothing on the selenoid to say where the + and - goes. I'm assuming if he gets it wrong it will destroy it. Can anyone help me? I'd trawled the internet with no luck.
Thanks
karl
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