I enjoyed building the original DIY zoom controller so much I came up with this variation. I'm sure it's been done before but I've haven't seen it posted. This one uses 6 momentary pushbutton switches, 2 rows for each zoom direction: telephoto and wide and 3 buttons in each row for the 3 zoom speeds. You can press any one button to directly select the speed and direction desired without having to go through other speeds. 7 individual resistors are used to select the right resistance needed- see schematic below. Resistor values probably aren't perfect but hey, it works. 3 pushbutton switches are normally-open and the other 3 normally-closed.
I think I'll build a new one with better quality switches. These are from Radio Shack and they are cheap- quality and price. Disregard the button colors as they came in red and black both in each package.
I think I'll build a new one with better quality switches. These are from Radio Shack and they are cheap- quality and price. Disregard the button colors as they came in red and black both in each package.
