Okay, I took the chance and tried it...  with 6mA, at lower the 10 Hz=20
causes the motors to pulse oddly, above 20Hz it smooths out.  Up to=20
almost 1Khz, it's smooth, but in the several-Khz range, there a=20
high-pitch squeal/whistle.

So I used just under 1Khz and varying the duty cycle changes the speed=20
nicely.

So convection motors figured out, and I did also get an external PID=20
controller to properly read the thermocouples and control the heaters. =20
So now onto the conveyor motor.

Cheers & thanks,
-Neil.



On 8/10/2012 10:53 AM, Neil wrote:
> Is this a typical frequency for this "typical" DC motor controllers?
> Haven't found much info on this other than hobby-type DC motor
> controllers with max frequencies in the 16-21Khz range.
>
> BTW, why do you specifically say from the *CMOS* output?
>
> Cheers,
> -Neil.
>
>
>
> On 8/10/2012 12:57 AM, David Duffy (AVD) wrote:
>> Maybe apply a low-ish frequency (a few 100 Hz) to the opto (via a 1K
>> resistor) from the CMOS output of the function generator and vary the
>> duty cycle to see what happens? David...

--=20
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