Black Lives Matter.
Started by mattsoft, October 01, 2018, 03:59:09 am
Quote from: X-Col on December 13, 2018, 05:03:35 am@mattsoftJust to let you know that another PicoPSU arrived today and it works nicely with the X68000!!Fitted your version 1 board today and all is good Thank you, and hope you find the problem with yours!
Quote from: mattsoft on December 13, 2018, 05:59:21 amNice! So the shutdown issue was perhaps PicoPSU-brand related?
Quote from: leonk on December 14, 2018, 05:21:19 pmAny progress on the Easy PicoPSU complete solution? I just got an XVI HD in, and the "lego" piece power supply is shot. Everything is black in there, fuse popped.. what a disaster. Looking for new PSU solution.
Quote from: leonk on December 26, 2018, 02:22:30 pmI just want to say that this device worked great for me in restoring an XVI. I did notice that 3 5V pins on the pico ATX connector arenâ€™t connected but that should be fine and there are enough 5V sources. I did find a strange issue with one of my connected FD. It doesnâ€™t work. The 5V line is only abou 3.5V. The other 5V lines around the system are at 4.95V. I wonder if thereâ€™s something wrong with this FD that pulls the 5V rail down hard. I replaced all the caps. Hmmmm
Quote from: mattsoft on December 27, 2018, 03:19:38 amNew PCB with onboard AC-DC to be tested this weekend. This aims to be an all-in-one internal replacement for the lego brick PSU. Preview of board attached. If this works OK, I'll post the gerbers and BOM to GitHub.
Quote from: leonk on December 27, 2018, 04:57:52 amQuote from: mattsoft on December 27, 2018, 03:19:38 amNew PCB with onboard AC-DC to be tested this weekend. This aims to be an all-in-one internal replacement for the lego brick PSU. Preview of board attached. If this works OK, I'll post the gerbers and BOM to GitHub.Can you post pics of underside as well? I want to confirm the traces.Also, for your latest design, one should know they need to choose one or the other, not both! (i.e. use PicoPSU or AC/DC converter)
Quote from: leonk on December 27, 2018, 08:03:55 amOh.. right. my mistake. Rather than using an external 12V power source, you are using it as all internal. In this case, what's not seen, is the 12V + GND wires for the PicoPSU will not come from the barrel style connector, but rather jump in from the AC/DC internal PSU. The internal PSU will then get it's AC in from the stock connector / after the power switch. Very nice. I think it would still be safe to keep the internal fan off as the AC/DC converter will be switching type which has very high efficiency with minimal heat generation (unlike the more traditional linear supplies that dissipate a lot of heat)
Quote from: leonk on December 29, 2018, 02:45:37 amI was thinking about this solution, and realized what has been bugging me.. the missing ground!In Japan (or at least when these computers were made) all outlets were 2 prong 100V / 60hz AC. Hence all electric devices were only 2 prong. Reference ground for computers is very important, hence why the ground posts were added (and used!). A lot of these old power supplies also use a simple transformer to step down the voltage.. so which pin gets 100V AC vs Neutral isn't that important.On the other hand, the modern AC/DC 12V switching power supply you want to use requires a proper ground (to reference against in order for the over voltage and other protections to work correctly). I'm also not too sure about what will happen if you feed 110V AC into ground pin.. I suspect not a good thing.This is why, when I put a modern power supply into my OG X68000, I replaced the power cord on my X68000 with a 3 prong one. This way, I know for sure what is AC, Neutral and ground.As for your original solution, it worked great because the external 12V 10A power supply is properly grounded and has all the required fuses/safeties in place.
Quote from: leonk on January 10, 2019, 03:38:38 amI want to reiterate an import finding I've made with both the OG X6800 running a PC ATX PSU as well as PicoPSU on the XVI HD.Do not power the floppy drives from the ATX connector. Even when PicoPSU is used inside a standard PC, it's not designed for that. That's why breakout cables are provided on the PicoPSU to power drives (floppy, CD-ROM, Hard Drives, etc.) The ATX connector can not reliably provide enough current for both the computer as well as FDD's.
Quote from: amigo-mexicano on January 22, 2019, 08:48:28 amWhat a cool project! Been reading all day long about it. Congrats mattsoft, and thanks for sharing!Now, this says it's for the ACE, but should work for any model, right? I want to use it on a SUPER...
Quote from: hyrulebr on March 26, 2019, 12:47:32 amHey Mattsoft!Just won a X68000 OG (CZ-600C) and for sure it will need a new ps. Do you have anything for a OG? I donÂ´t know if the ps and connectors are different from a Ace for example.
Quote from: leonk on April 05, 2019, 02:41:24 pmEven if itâ€™s repair to like new condition, the original design is more than 30 years old and poor. It will fail again the same way. PSU technology improved. Why take the chance?