The LaST Upgrade - Part 6 - PSU

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Re: The LaST Upgrade - Part 6 - PSU

Postby troed » Thu Jan 24, 2013 8:09 pm

exxos wrote:@troed.. Maybe you could test your 80watt thing before you install it ?


Hmm, maybe. I actually thought I had a compatible brick but didn't so I'll have to order that as well - after that I'll see. While I'm handy (very) with a soldering iron I don't usually wire up my own circuitry beyond simple switches.

I assume you've read the manual? I would be surprised if the numbers they claim aren't correct since they've been in business for a while.

http://resources.mini-box.com/online/PW ... manual.pdf

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Re: The LaST Upgrade - Part 6 - PSU

Postby exxos » Thu Jan 24, 2013 8:37 pm

I had a quick look at the manual, seems to state 10A 12V input, so thats 10A x 12V = 120watts. 8amp at 3.3V is 26.4watts, but I doubt you can run a 30watt 12V psu and still pull 8amps from it on the 3.3V rail which was what was suggested to me, that would mean 400mA 12V input to generate 8amp at 3.3v, the wattage adds up, but not the input output amps. For that to hold true about wattages, it would have to have a step down coil, though it does not look like dual connections going by the images.

It does seem to have thermal issues , stating 60seconds max at full load kinda thing, im not supprised, its very hard to keep things cool at 8amps. I am a bit skeptical of 86%. I suppose its something not many people are bothered about anyway. It just would be useful to know what its "Really" capable of, it may save some people some nasty repair bills...

I will be building step down switchmodes (not any time soon though ). I really wanted a adjustable design, so I can tweak the 3.3V, the 060 cpu is happy up to about 4V (from memory) if not more. So CT60 people may be able to clock faster on a higher voltage. The inverters im building are step up at the moment, I can hit 89% with no heat at all, My step up inverter hits 97% at lighter loads, so step downs should be able to push 97% or more at 8amps and up. Anyway, off topic getting a bit..

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Re: The LaST Upgrade - Part 6 - PSU

Postby dhedberg » Fri Apr 04, 2014 6:28 pm

exxos wrote:
krupkaj wrote:You write quality capacitors are necessary but what are the best? Which manufacturers do you recommend? Thanks for info

I listed the part numbers on my website, these are good for rating and price, only panasonic I use now, but they also do "cheap" capacitors, but for a few pence more you can buy the caps like I have listed.

Great articles and great info! I'm still curious how you can distinguish quality capacitors from cheap ones? What's the difference? Price only or is it what they are made of or their specifications?

Thanks,
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Re: The LaST Upgrade - Part 6 - PSU

Postby exxos » Fri Apr 04, 2014 7:08 pm

For switchmodes, in particular capacitors which are going to get hot, it is better to go for 105deg caps (over 85deg ) or higher as they will last longer. Also the ESR rating, mostly you can simply look at the mA figure, higher the better. Capacitors have resistance, and higher the resistance the hotter it will get and shorter its life. Also lower resistance means better mA rating so you can "load" the capacitor more without stressing it.
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Re: The LaST Upgrade - Part 6 - PSU

Postby qq1975b » Mon Apr 07, 2014 6:47 am

Very interesting updates of the ST PSU :thumbs: . It is a pity that design a new one for all ST/Mega ST/Falcon models is not possible due to cost production.

I have to check my ST/Mega/Falcon models to see how many different PSU there are. I think there were at least 6 on ST...don't know about Falcon.
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Re: The LaST Upgrade - Part 6 - PSU

Postby troed » Mon Apr 07, 2014 7:26 am

qq1975b wrote:Very interesting updates of the ST PSU :thumbs: . It is a pity that design a new one for all ST/Mega ST/Falcon models is not possible due to cost production.


I've planned replacing mine but I'll likely go the pico-PSU route. It does take something away from the original spirit - but frees up internal space for modification as well as removes both a heat and interference source ..

(With that said, I much appreciate the component list here and might make sure that my original PSUs get updated anyway)

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Re: The LaST Upgrade - Part 6 - PSU

Postby exxos » Mon Jul 21, 2014 3:32 pm

http://www.exxoshost.co.uk/atari/last/psu/index.htm

I updated the page today somewhat and done more tests on 2 more PSU's.

I have noticed that the display dims when the floppy is accessed on these PSU's even though regulation seems reasonable. This in part may down to be failing caps or other parts, though I need to change parts to investigate this fully. Though for now, it shows that some PSU's , in particular the TOKIN PSU, is failing pretty bad.

If anyone has any PSU's (230V UK) which they could donate for inclusion for review and testing then please let me know. The SR98 is the most common I have seen, though still in need of another one to do more test currently.

Please also take a look at my webstore http://www.exxoshost.co.uk/atari/last/store.htm, any purchases made help put money back into my pot to do more research and fixes for more PSUs and many other things.
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Re: The LaST Upgrade - Part 6 - PSU

Postby exxos » Tue Nov 03, 2015 6:22 pm

Finally got the Falcon 030 PSU under the scope.

http://www.exxoshost.co.uk/atari/last/psu/index.htm#FALCON

Very interesting PSU. I am still not 100% decided on parts to update it. The rectifier is a right arse to fit :lol: Its not got a normal pinout which makes life harder. I managed to fit a regular SIL type in there, but its not pretty. Probably no worse than the ST PSU overall, but on the falcon PSU, everything is in the way! I am going to try a smaller type next time I do a order somewhere.

As a side note, I have updated the ASP section a bit. Seems to be a few revisions of the board which I have started to see, so been documenting them aswell.
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Re: The LaST Upgrade - Part 6 - PSU

Postby dhedberg » Tue Nov 03, 2015 6:53 pm

exxos wrote:Finally got the Falcon 030 PSU under the scope.

Very interesting. I'd like to recap my Falcon030 PSU. Please let us know when you have a kit ready! I can send you a picture of the PSU in my Falcon030 as well the one in my C-lab MK-II PSU if you're interested.
I noticed that you're working on a completely new PSU as well. Is that for the ST/STe only or will it work for the Falcon030 too?
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Re: The LaST Upgrade - Part 6 - PSU

Postby exxos » Tue Nov 03, 2015 6:57 pm

dhedberg wrote:
exxos wrote:Finally got the Falcon 030 PSU under the scope.

Very interesting. I'd like to recap my Falcon030 PSU. Please let us know when you have a kit ready! I can send you a picture of the PSU in my Falcon030 as well the one in my C-lab MK-II PSU if you're interested.
I noticed that you're working on a completely new PSU as well. Is that for the ST/STe only or will it work for the Falcon030 too?


If you have a different PSU than the one on my site then yes please send images. Its the only PSU I have seen in the falcon so far.

My new PSU is over in another thread here http://www.atari-forum.com/viewtopic.php?f=28&t=28746

I was considering the ST PSU design to work in the falcon also, but looking on how good the Falcon PSU is, I don't think it really needs a new one designing.
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Re: The LaST Upgrade - Part 6 - PSU

Postby exxos » Tue Nov 03, 2015 9:39 pm

SR98 UPDATE - now on my site also, scroll down to the "SR98 PEAK CURRENT UPDATE" bit.

Been working on the "video dim" problem where probably there is only me whos ever noticed it :lol: Also seems to be solving STE video ghosting issues and some noise issues also.

I am still investigating, but some good progress has been made, so thought I would post the info while its in my head :)

http://www.exxoshost.co.uk/atari/last/psu/index.htm
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Re: The LaST Upgrade - Part 6 - PSU

Postby SoundDoctor » Mon Nov 09, 2015 1:46 am

exxos wrote:
dhedberg wrote:
exxos wrote:Finally got the Falcon 030 PSU under the scope.


I was considering the ST PSU design to work in the falcon also, but looking on how good the Falcon PSU is, I don't think it really needs a new one designing.


Given that Falcon PSUs are all 23 years old and likely to fail at some point (like mine did this week) it might be a good idea to make it work for both ST and Falcon in any case. Maybe a choice of two harnesses? On the other hand a lot of Falcons are heavily modded with CT60 and the like so maybe the need is too niche.
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Re: The LaST Upgrade - Part 6 - PSU

Postby exxos » Mon Nov 09, 2015 9:07 am

SoundDoctor wrote:
Given that Falcon PSUs are all 23 years old and likely to fail at some point (like mine did this week) it might be a good idea to make it work for both ST and Falcon in any case. Maybe a choice of two harnesses? On the other hand a lot of Falcons are heavily modded with CT60 and the like so maybe the need is too niche.



I don't think your PSU has failed though ;) Nothing lasts 23 years anymore, lucky to last 6 months! I think with a bit of TLC the PSU will run for many more years. Its possible my ST PSU design could be used in the falcon, but as tested on my site, it seems a really good PSU to start with.

As for CT60, totally different PSU issue. Needs 3.3V at 10amps for starters. I couldn't make a design to fit inside a case with a CT60, simply no room. It would be like re-inventing a PC PSU and trying to get it to fit inside the case. It could be possible to design something like the picopsu and use a external transformer, other than that, a total switchmode to fit inside along with CT60 with little space, that would soak up a lot of time and money.
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Re: The LaST Upgrade - Part 6 - PSU

Postby grobda » Mon Nov 09, 2015 10:11 pm

just had my stf start to fail reading good floppies on its inernal drive (long button type). external drive worked fine. swapped drives over didnt help, the previously working external failed when internal. picked up an stfm today and swapped its psu with the stf = internal drives works.

the stfm has had its short button drive replaced with a teac drive, and it works with the stf's psu, so i guess its coming down to tired psu and borderline tolerances. so now they both work, but I guess I should refurb them :lol:

nice work exxos on your writeups, without them i'd still be blaming the floppy or wd1772 :cheers:

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Re: The LaST Upgrade - Part 6 - PSU

Postby exxos » Mon Nov 09, 2015 10:17 pm

grobda wrote:just had my stf start to fail reading good floppies on its inernal drive (long button type). external drive worked fine. swapped drives over didnt help, the previously working external failed when internal. picked up an stfm today and swapped its psu with the stf = internal drives works.

the stfm has had its short button drive replaced with a teac drive, and it works with the stf's psu, so i guess its coming down to tired psu and borderline tolerances. so now they both work, but I guess I should refurb them :lol:

nice work exxos on your writeups, without them i'd still be blaming the floppy or wd1772 :cheers:


Cool :)

Yeah the PSU is the route of all evil :twisted: Its right about stuff being borderline, Upgrading STE's to 4MB pushed just about every PSU I had over the edge 10+ years ago. Only at the time I thought the simms were blowing up the STE's. So I ended up binning them :roll:

I've got 3 long button drives here, cant get the bloody things to work , Will figure it out eventually :lol:
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Re: The LaST Upgrade - Part 6 - PSU

Postby exxos » Fri Jul 29, 2016 12:12 pm

Added another couple of PSU types to my page.

LITON PSU
http://www.exxoshost.co.uk/atari/last/psu/index.htm#LITON2350

PHIHONG
http://www.exxoshost.co.uk/atari/last/psu/index.htm#PHIHONG

If anyone has any PSU's not documented on my page then please consider donating it for dissection.
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Re: The LaST Upgrade - Part 6 - PSU

Postby frost » Fri Jul 29, 2016 4:51 pm

Hi,

I have a a Phihong PSM-4012-2 that came from a Mega. Are you interested ?

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Re: The LaST Upgrade - Part 6 - PSU

Postby dlfrsilver » Tue Aug 09, 2016 7:36 pm

Chris, remember the TV rheinwald pictures of my 1040 stf. I upped a while ago
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Re: The LaST Upgrade - Part 6 - PSU

Postby exxos » Tue Aug 09, 2016 7:42 pm

frost wrote:I have a a Phihong PSM-4012-2 that came from a Mega. Are you interested ?


Got it thanks :)

dlfrsilver wrote:Chris, remember the TV rheinwald pictures of my 1040 stf. I upped a while ago

ummm... Last night is still a bit vague...
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Re: The LaST Upgrade - Part 6 - PSU

Postby KLund1 » Thu Aug 18, 2016 4:14 am

Hoping you could help with dead PSU. The fuse is good, as is the swtich.
It is a ASP34-1 rev 6, 110V USA, from a 1040STf. Pictures attached.
Will one of you repair kits from your store work with this? If so which one?
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UPDATED: Falcon 030(FX-1)(CF int & removable SD), MSTE 4+PS3000 4160STE 2.06+HDFD STacy4-internal-USD 1040STFM+I.B.Driver-5.25"FDD 1040STF 1040ST 520ST-AdSpeed 400-48k 800+810x2+820+822+825+830+835+850, 800XL+IndusGT 600XL 130XE+XF551x2 Portfolio 1200XL APE(Warp+32in1 OS SuperVideo 2.1 256k RAMBO)+1050x2 USD'd+SIO2PC, PC1+PCH204+PCM124+PCF554x2

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Re: The LaST Upgrade - Part 6 - PSU

Postby exxos » Thu Aug 18, 2016 7:01 am

KLund1 wrote:Hoping you could help with dead PSU. The fuse is good, as is the swtich.
It is a ASP34-1 rev 6, 110V USA, from a 1040STf. Pictures attached.
Will one of you repair kits from your store work with this? If so which one?


The kits I sell are not likely to fix a dead PSU. Normally dead PSU is blown main switcher transistor, but normally it blows the fuse also. Have to checked all solder joints also..
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Re: The LaST Upgrade - Part 6 - PSU

Postby KLund1 » Thu Aug 18, 2016 10:51 pm

Thanks
I would not know how to test a main switcher transistor, nor even know where it is on the pcb. But I could probably swap out the part if I had a correct replacement in hand. My soldering skills are ok.
Do your new updated PSU's work on 110v. If so it might be better for me to get one of those for my main use STE and put the STE's old psu in this 1040STf
UPDATED: Falcon 030(FX-1)(CF int & removable SD), MSTE 4+PS3000 4160STE 2.06+HDFD STacy4-internal-USD 1040STFM+I.B.Driver-5.25"FDD 1040STF 1040ST 520ST-AdSpeed 400-48k 800+810x2+820+822+825+830+835+850, 800XL+IndusGT 600XL 130XE+XF551x2 Portfolio 1200XL APE(Warp+32in1 OS SuperVideo 2.1 256k RAMBO)+1050x2 USD'd+SIO2PC, PC1+PCH204+PCM124+PCF554x2

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Re: The LaST Upgrade - Part 6 - PSU

Postby exxos » Fri Aug 19, 2016 7:31 am

KLund1 wrote:Thanks
I would not know how to test a main switcher transistor, nor even know where it is on the pcb. But I could probably swap out the part if I had a correct replacement in hand. My soldering skills are ok.
Do your new updated PSU's work on 110v. If so it might be better for me to get one of those for my main use STE and put the STE's old psu in this 1040STf


Somewhere I have got replacement switching transistors, but they are not the same number, and its just one of the many 100's of things on my "to do list" of things which I need to try out :roll:

My PSU's are configured with 230V or 110V primary taps when you order. Theres only 1 110V PSU left in stock at moment.
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Re: The LaST Upgrade - Part 6 - PSU

Postby exxos » Mon Sep 05, 2016 6:50 pm

2 more PSU's added to my site :)

MSTE PSU PHIHONG PSM-5341 240V
http://www.exxoshost.co.uk/atari/last/psu/index.htm#MSTE

MITSUMI SR151 240V
http://www.exxoshost.co.uk/atari/last/psu/index.htm#SR151
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Re: The LaST Upgrade - Part 6 - PSU

Postby dlfrsilver » Fri Sep 09, 2016 2:24 pm

exxos wrote:
frost wrote:I have a a Phihong PSM-4012-2 that came from a Mega. Are you interested ?


Got it thanks :)

dlfrsilver wrote:Chris, remember the TV rheinwald pictures of my 1040 stf. I upped a while ago

ummm... Last night is still a bit vague...


check here :

viewtopic.php?f=15&t=26933&hilit=dlfrsilver&start=25

you'll find on this page the picture of my TV rheinwald PSU.
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