Am 16.02.2017 08:40, schrieb Gene Heskett:
> On Thursday 16 February 2017 02:20:30 Valerio Bellizzomi wrote:
>
>> On Wed, 2017-02-15 at 19:13 -0500, Gene Heskett wrote:
>>> On Wednesday 15 February 2017 15:12:17 Valerio Bellizzomi wrote:
>>>> On Wed, 2017-02-15 at 14:32 -0500, Gene Heskett wrote:
>>>>> On Wednesday 15 February 2017 14:13:17 Valerio Bellizzomi wrote:
>>>>>> On Wed, 2017-02-15 at 12:45 -0600, dragon wrote:
>>>>>>> The 20ma control circuit on the VFD is an analog control,
>>>>>>> where as the parallel port pin is a digital (on/off) signal.
>>>>>>> You will need some sort of hardware interface between the
>>>>>>> two to do a digital to analog conversion.
>>>>>> is there a list of supported hardware, that I could buy on
>>>>>> ebay ? I was looking at
>>>>>> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?LinuxCNC_Supported_Ha
>>>>>> rdwa re
>>>>>>
>>>>>> I have already 3 stepper drivers mounted in a metal box with
>>>>>> their power supply, I would need only a small interface for
>>>>>> the spindle.
>>>>> Using software stepping? I'd still use a pwmgen module in the
>>>>> computer to drive the vfd, but I'd put a SpinX1, from Mesa
>>>>> between them, for the noise isolation (vfd's are noisy
>>>>> electrically), and the control is quite linear. I would put the
>>>>> pwmgen in the PDMgen mode, see the man page as that removes the
>>>>> need to dither the pulse width because each step is fixed, the
>>>>> dither keeps it at the requested speed. But with PDM, you don't
>>>>> need the dither.  With SW pwmgens, I'd choose a refresh rate
>>>>> below the servothread by about half, the vfd shouldn't mind.
>>>> I have checked out the mesa store, it is a problem for me that
>>>> they do not have paypal transactions among their choices for
>>>> payment, I do not own a credit card
>>>>
>>>> is there another way to purchase say a spinx1 or equivalent board
>>>> ?
>>> There are actually 2 web stores, one by Peter C. Wallace, out on the
>>> left coast, and Big John Thortons's site in southern Missouri. I am
>>> pretty sure either would take a check or money order. Big John ships
>>> the same day if he has it, 3 days to West Virginia is the worst he's
>>> done to me. I would imagine your money order would not be much
>>> slower.  Another day perhaps.
>>>
>>> Cheers, Gene Heskett
>> Thanks Gene, I have already ordered one spinx1 here
>>
>>
>> http://mesaus.com/index.php?route=product/product&product_id=91
>>
>> I guess it will take a month or so as I live in Italy
>>
> Thats a bummer. Maurius L., or Andy, is there not someone on your side of
> the pond that could get it there faster for when the next time comes up?
>
> Cheers, Gene Heskett
There used to be an internet shop in southern Germany, I forgot the 
address. That's EU, so shipping would last a few days at maximum. PCW 
should know, for he provided it to me some years ago.

Peter

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