On 09/19/2010 08:14 PM, Steve Blackmore wrote:
> Some of the CNC4PC boards are almost unmountable.. I think he leaves
>> out the holes to minimize the board space and the cost.. But I sure
>> wish he would add in a half square inch of extra board space for holes!
>>
> All the CNC4PC boards I've tested have been lacking in design (mounting)
> and performance using old legacy components.
>
> I'm not singling Arturo out here, most breakout board purveyors (I chose
> that word carefully) have not progressed past designs that can operate
> at much better than multiple uS switching rates.
>
> I've seen current production opto isolated boards still using CNY75B
> optos.
>
> It takes that opto 4.5uS to turn off, and 5uS to turn on
> again, think about that with pulses that may have to be 5uS long,
> there's little or no headroom before lost pulses at even 25kHz.
>
> Even Mach can output 100kHz on a parallel port with a fast PC!
>
> Mounting is the least of your problems when the basic unit is poor.
>
> Steve Blackmore
Steve,
The buffer board works as intended - it's only connecting an MPG
pendant. At least for me, mounting the board is the biggest problem.
Mark
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