Following Zach, I've just gone to finish off my stepper card. I noticed
something a bit strange in the existing instructions though.

Could I please have a ruling on whether C5 and C6 are necessary on
either an extruder or stepper controller? The stepper board instructions
say they're optional and yet they were included in the BOM for the
universal assembly instructions.

Vik :v)

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> The stepper board instructions
> say they're optional and yet they were included in the BOM for the
> universal assembly instructions.

The above is complete twaddle, please ignore.

Vik :v)

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Vik Olliver wrote:
> Following Zach, I've just gone to finish off my stepper card. I noticed
> something a bit strange in the existing instructions though.
>
> Could I please have a ruling on whether C5 and C6 are necessary on
> either an extruder or stepper controller? The stepper board instructions
> say they're optional and yet they were included in the BOM for the
> universal assembly instructions.

They're needed for the extruder but not the stepper: they're there to
smooth the commutator noise from the motor(s). As the stepper is just
coils permanently connected, they make chunky back-EMFs when you turn
them off (which the diodes soak up) but no nasty RF interference.

--

Best wishes

Adrian

Dr Adrian Bowyer
[staff.bath.ac.uk]
[reprap.org]
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