Simple Servo Driver
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Home > Articles & Tips Index > Tools and Electronics > Simple Servo Driver

[Courtesy of John Nilsson j.b.nilsson "at" worldnet.att.net, April 1999]

This is a simple design for a servo driver that you can build with about $5 of electronic parts and a small box.  It also includes an ammeter to measure the current drawn by the servo as you move the position around.

The current monitor is very useful in tracking down linkage problems - if your linkages are not free, or there is binding anywhere in the control system, you will see the current "spike" while moving the servo through its range.  If you see substantial spikes, try freeing up the linkage and check it again - you'll end up with longer flying times with each charge and smoother flight response to boot!

I took an extra nicad and put it in the box with a standard switch and charge jack for simplicity. This allows the nicad to be charged without opening the box.

You can click on the small image below for a full-size schematic.

johnnilsson_servodriver.gif (11581 bytes)

And here is a picture of an assembled unit:

johnnilsson_servodriverpic.jpg (56625 bytes)


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