Photo Flashes - These flashes all run from a single AA battery HOME

This model is very simple and charges as long as you hold the pushbutton:
Circuit Diagram aka Schematic reverse engineered from circuit board

This one charges with a single button press:
Circuit Diagram aka Schematic reverse engineered from circuit board

I do not gaurantee the accuracy or safety of any information herein.
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Do not experiment with or build any of the above circuits.