Hi Leonardo, I've attached a simple schematic I came up with recently for exactly the same purpose (0-10v analog out from 0-3.3v pwm). I have not had the chance to breadboard it yet, but believe it should work. You can adjust the R-C filter values as needed. The choice of opamp is fairly arbitrary as well, although a "rail to rail" part that gets close to 0v would be helpful.
You may not want to be making your own circuit, but it sounded like you are getting pretty desperate. If you would like this circuit tested before you spend time on it, I might have time later today to try it out. -- Ralph ________________________________________ From: Leonardo Marsaglia [ldmarsag...@gmail.com] Sent: Sunday, April 3, 2022 4:50 AM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] Best way to get analog voltage from 7i95 CAUTION: This email originated from outside the Walla Walla University email system. > > What are you searching for? You don't really need the optical isolator if > the VFD and computer grounds are tied together. If you do want isolation > then almost any optical isolator will work Even those "C" shape sensors > will do the job, The resistor and the capacitor are essential but their > values are not critical as long as the product of the R and C adds up to > about the same. > I just caught what you were asking lol, I'm a little burned out these days. I was searching for Andy's suggestion to see if there was something here but it's complicated. Electronic component distributors here are not that big like the ones in the US . So they don't have the variety you have there. Also they are not that well optimized for online selling like for example Digikey, so searching for a component is really a pain in the ass sometimes. In fact, many times in the past when my brother and I were experimenting with induction heaters, it was a lot easier and practical to purchase everything from Digikey and ship it here, the shipping usually took 3 or 4 days. The obvious problem is when you have to purchase 5 USD on an item and the shipping costs like 80 USD. El dom, 3 abr 2022 a las 6:10, gene heskett (<ghesk...@shentel.net>) escribió: > On Saturday, 2 April 2022 23:51:58 EDT Chris Albertson wrote: > > What are you searching for? You don't really need the optical > > isolator if the VFD and computer grounds are tied together. If you > > do want isolation then almost any optical isolator will work Even > > those "C" shape sensors will do the job, > > And quite likely they can also do the voltage boost to a 10 volt swing > needed at the output, and 20x faster than the typical 4 pin opto. I'd put > them in the dark with a heat shrink sleeve though. > > > The resistor and the > > capacitor are essential but their values are not critical as long as > > the product of the R and C adds up to about the same. > > I'm not convinced the filter would be needed, the vfd will generally have > its own filter. > > > On Sat, Apr 2, 2022 at 8:32 PM Leonardo Marsaglia > > <ldmarsag...@gmail.com> > > wrote: > > > Well, a quick search gave me ZERO results here. The only results were > > > at ar.mouser.com but mouser is not established here AFAIK, it looks > > > like their > > > spanish site is from Mexico. > > > > > > El sáb, 2 abr 2022 a las 19:15, gene heskett (<ghesk...@shentel.net>) > > > > > > escribió: > > > > On Saturday, 2 April 2022 17:14:41 EDT Andy Pugh wrote: > > > > > > On 2 Apr 2022, at 04:33, Leonardo Marsaglia > > > > > > <ldmarsag...@gmail.com> > > > > > > wrote: > > > > > > > > > > > > Well, I can try that but I recall we did a simple low pass > > > > > > filter > > > > > > years ago > > > > > > > > > > This works, and is isolated. > > > > > > https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fphotos.google.com%2Fshare%2FAF1QipPXuj4R1h7P3oLpKCcGnfS-mFd-qO5nF&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7C58b86ce96b304d7089f208da1568345d%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637845834553819364%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=pwqrZOzr6kzBZN6OjdOHpNMFVm72HrCcpzEJJbunGqI%3D&reserved=0 > > > Pe> > > > > > WEY-40VKkLIfDkAhSi7m4YDPVm0JCGQ/photo/AF1QipPEONYllA-BBGWD6cOLXsS > > > > > WFnCU3 X27btSueFJs?key=dDNfajB5TTZDalphY2dKamtVeDdrcTRJaGZqdmZR > > > > > > > > And that is exactly what the doctor ordered. Thanks Andy. > > > > > > > > But can Leonardo src it in his reach? > > > > > > > > Cheers, Gene Heskett. > > > > -- > > > > > > > > "There are four boxes to be used in defense of liberty: > > > > soap, ballot, jury, and ammo. Please use in that order." > > > > > > > > -Ed Howdershelt (Author, 1940) > > > > If we desire respect for the law, we must first make the law > > > > respectable.> > > > > > - Louis D. Brandeis > > > > > > > > _______________________________________________ > > > > Emc-users mailing list > > > > Emc-users@lists.sourceforge.net > > > > https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7C58b86ce96b304d7089f208da1568345d%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637845834553819364%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=AReEdGfEGydsA7Y8JbJzxbSEhWW%2FVmtsMw81i6bhdIU%3D&reserved=0 > > > > > > _______________________________________________ > > > Emc-users mailing list > > > Emc-users@lists.sourceforge.net > > > https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7C58b86ce96b304d7089f208da1568345d%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637845834553819364%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=AReEdGfEGydsA7Y8JbJzxbSEhWW%2FVmtsMw81i6bhdIU%3D&reserved=0 > > > > -- > > > > Chris Albertson > > Redondo Beach, California > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7C58b86ce96b304d7089f208da1568345d%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637845834553819364%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=AReEdGfEGydsA7Y8JbJzxbSEhWW%2FVmtsMw81i6bhdIU%3D&reserved=0 > > > Cheers, Gene Heskett. > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author, 1940) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > > > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7C58b86ce96b304d7089f208da1568345d%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637845834553819364%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=AReEdGfEGydsA7Y8JbJzxbSEhWW%2FVmtsMw81i6bhdIU%3D&reserved=0 > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7C58b86ce96b304d7089f208da1568345d%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637845834553819364%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=AReEdGfEGydsA7Y8JbJzxbSEhWW%2FVmtsMw81i6bhdIU%3D&reserved=0
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