My last order from JLC was six different designs, five or ten of each, one fully stuffed with ten or so high grade opto's and a bunch of discretes. Total cost with shipping and paypal fee was $150, arrived in one week. A single board only job would probably be $20 with shipping. Parts for an assembled board are often less than the cost of a solder stencil by itself (and their stencils are pretty cheap!), unless you have some higher end/scarcer parts (like stm32f103 processors now $50...). They only assemble smd parts, no through hole.
-- Ralph -- Ralph On Sep 8, 2022 7:00 PM, gene heskett <ghesk...@shentel.net> wrote: CAUTION: This email originated from outside the Walla Walla University email system. On 9/8/22 18:03, Chris Albertson wrote: > I did not know about these. Thanks so much for posting. So, after the > software stops cycling the output pins, the 10 uf cap discharges through > 750 Ohm the opto-isolator's LED and the relay opens. I will have to > calculate the time delay, but my back of the envelope says about 0.02 > seconds. Is that close to what you observe? Or did I miss a decimal place? > > It looks like you have a good design and if you can sell these at a > reasonable price they should be standard equipment. > > But I was thinking, Now that we have companies like JLCPCB who can make > printed circuit boards and solder components for well under $1 per PCB, I > would not want to be in the business of making and selling small electronic > devices. I would design this thing so that it used only parts from > JLCPCB's "short list" to keep the cost under $1. Post the design files and > let people order their own directly from the manufacturer. An interesting idea. Any idea of the delay to expect after they receive the order and the payment? How about what most folks call NRE? > My concern with this is that it does not catch a failure where only the > user space program crashes and the kernel-space task continues to run. > Perhaps something else can watch for this? I have not ever observed that. Not saying it cannot happen, but based on my experience, someplace between pretty slim and point triple ought zip. > > On Thu, Sep 8, 2022 at 2:15 PM <m...@mattshaver.com> wrote: > >> On 2022-09-08 15:55, andy pugh wrote: >>> I rely on the Mesa watchdog. If I was running a system that couldn't >>> do that then I would start looking t watchdog circuits, though last >>> time I looked I didn't see anything that simply opened a relay if the >>> charge pump stopped. >> I actually make this: >> >> https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.mattshaver.com%2Fsite.php%3Flink%3Dpcbs%2Fcp2estop%2Findex.htm&data=05%7C01%7Cralph.stirling%40wallawalla.edu%7Caf303bf0f61a4b48a8ac08da92070fd5%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637982856289742948%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=QYI598yxb%2BiakEQjjsdEPwZLFYxvJEAixgwFPQMZugA%3D&reserved=0 >> >> It was used in Smithy machines and I have a bunch of them left. Haven't >> sold one in years and don't know what they should cost anymore, but if >> someone needs one I could look into it! :) >> >> Thanks, >> Matt >> >> >> _______________________________________________ >> 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=05%7C01%7Cralph.stirling%40wallawalla.edu%7Caf303bf0f61a4b48a8ac08da92070fd5%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637982856289742948%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=9Ujt%2BkciamwMnXmE9cE1XgVOAOXAl5ZbQNxHliXpHp4%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 Genes Web page <https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Fgeneslinuxbox.net%3A6309%2F&data=05%7C01%7Cralph.stirling%40wallawalla.edu%7Caf303bf0f61a4b48a8ac08da92070fd5%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637982856289742948%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=gBiV655%2FDlM8HXI5dtI9mjmuueuotpbpVpH1PU5JXVw%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=05%7C01%7Cralph.stirling%40wallawalla.edu%7Caf303bf0f61a4b48a8ac08da92070fd5%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637982856289742948%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=9Ujt%2BkciamwMnXmE9cE1XgVOAOXAl5ZbQNxHliXpHp4%3D&reserved=0 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
