Snod35 V1 - Electrical
The Snod35 uses 3 AAA batteries to power the Sanko motor and a green LED light. A 10 Ohm resister is used to slow the motor down a hair. Below at left is the LED (2.1V) and 10 Ohm resistor (both from Radio Shack). With the motor at full speed, a slight vibration can be felt on the outside of the adapter body. With the 10 Ohm resister in place, the motor is slowed just enough so that it is next to impossible to tell if the adapter is running. The LED light is used to indicate that the motor is running and also serves as a reminder to shut the adapter off when not is use. Below at center is the battery holder with a built in on/off switch (Philmore BH3311). I tested the battery life of the adapter, but after 36 hours the motor was still vibrating as if the batteries were new, so I didn't see any use for continuing the test.
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The image above at right is one of my previous designs that used a rheostat to control the motor speed. Though it worked fine, I almost always had that rheostat set so that the motor ran slightly under full speed. The 10 Ohm resister serves a similar purpose and is much less bulky. I will most likely use the rheostat with the Snod35 V2. Though it may not be used much, it can still come in handy when using different shutter speeds.
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The image above at left shows the back of the assembled adapter. In the picture you can see the 10 Ohm resistor and the 30AWG stranded wire that I used. It is somewhat difficult to find stranded wire smaller than 30AWG (in small quantities). The white nylon nuts hold the threaded rod tightly in place. The image above at center shows the soldering tools used to make the various connections. Above at right is the Sanko motor.
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