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Photography Circuits
Last Updated on:
Friday, October 03, 2014 10:38 AM

Circuits Designed by Dave Johnson, P.E. :
DARKROOM CAMERA SHUTTER TIMER
This circuit was designed to control a film exposure shutter for a darkroom. It has 8 time steps ranging from 0.35 seconds to 4 seconds. It is activated by a foot switch and draws power from an external 12-volt DC supply.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Casio QV-200 Digital Camera Cable.  -  Lose your cable? Build it yourself and save $29. Fits many QV models.....
Darkroom Camera Shutter Timer -  This circuit was designed to control a film exposure shutter for a darkroom. It has 8 time steps ranging from 0.35 seconds to 4 seconds. It is activated by a foot switch and draws power from an external 12-volt DC supply.... [Designed by David A. Johnson]
Lightning Activated Camera Shutter Trigger -  This circuit is used to trigger a camera's electronic shutter circuit when a flash of lightning is present.  This circuit would also work for photographing fireworks displays or other events involving flashes of light…. [G. Forrest Cook]
Lightning Detectors -  The following circuit is an improved version of my original Lightning Detector designed to run on a 5 volt supply....(circuit added 05/05/05)


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