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I placed an order for the PTN78000W from Texas Instruments as a free sample on the 19th Dec had notification they posted it on 20th Dec and it arrived by FedEx on the 23rd Dec free of charge. I will now spend some time building the rest of the circuit after xmas, I may just use a zener on the output so that if it goes over voltage my camera has some protection. All I have to do now is decide which battery I am going to sacrifice.
Adrian
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