This is the eight in the series of instructions on how to build the YSM35B Vibrating 35mm DOF Adapter. In the last part made the control box. Now we re-examine the difference between this version and the original.
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The original YSM35A used a Rheostat and Power switch. I couldn't find a Rheostat this time around so I subsituted with a Mini Volume Control. Rheostats and Volume Controls are found in the Potentiometer area of hobby electronics (e.g. Radioshack).
The difference is Rheostats are made for higher voltages and doesn't turn off. That is why the power switch (SPDT Mini-Toggle) is needed. A volume control switch is a potentiometer with a built-in SPDT switch. We will be using a tiny motor so it should be fine to put 1.2 to 3 volts through it without burning it out. The dial won't have the precision of a rheostat but it will do.
Another difference with the A model is the use of only one battery. This reduction from 2.4 - 3v (NIMH/Alkaline) to 1.2 to 1.5 volts (NIMH/Alkaline) is an experiment. With the soldering skill you develop it won't be too hard to change battery holders later.
We attach the motor and install a power plug on the adapter itself.