Rich Ottosen wrote:
>Dan:
>The Signetics data books I have show the NE544 the schematic for its
>use. There is also application note AN133 that gives more detail on how
>to use the chip. Very informative.
>
>If you can't find the data elsewhere then I can scan it for you.
>

Many thanks to Mike and Dale and Rich for your responses.

Alexandre's link provided the schematic for the exact servo I have,
Futaba S3003. It uses one BAL6686 h-bridge and one BA6688 servo control
chip. I assume the 6686 has clamp diodes built-in, but I'll have to see
if I can find the specs. Other than that, it looks like the only
built-in noise suppressor is a cap across the motor - value unknown.

I guess I don't need an NE544 datasheet, but it would be interesting
to know what sort of noise filters might be present in the servos
that use that chip.

I think Drew might also use some help in designing a good filter for
his servo problem on the other thread.

thanks,
- dan michaels
www.oricomtech.com
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