New Atari PSU in the making

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Re: New Atari PSU in the making

Postby exxos » Sun Dec 13, 2015 3:55 pm

spiny wrote:mine has turned up, but i'm on holiday, so can't fit it till Tuesday. I'll take loads of pics :)


Cool :) I could put a link from my site to your page if you put them on your site :)
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Re: New Atari PSU in the making

Postby exxos » Fri Feb 12, 2016 4:05 pm

Thanks for the couple of order which came in recently. I'm building up a batch of 5 currently, where 2 are spoke for leaving 3. Once this batch is done then the price will be increasing slightly a mentioned previously.

One reason is, while its a little cheaper ordering parts in bulk, its costing me a lot in parts which may never be used. Some price breaks are at 10, some 50, some 100. So each PSU hereafter will be built up individually which means ordering in parts individually and price goes up a little. Sorry about that, though I can't keep buying in £100's worth of parts each time just to keep the final sale price down a little.

While the price will increase, I am having to spend a lot of time building these up. So if people are happy to have a "kit" then likely the price can be kept about the same. I may offer built and "kit", though not yet decide which is the best course of action.
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Re: New Atari PSU in the making

Postby TheNameOfTheGame » Fri Feb 12, 2016 6:53 pm

First time seeing this but I love the design. Probably order one next month. Great idea!

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Re: New Atari PSU in the making

Postby TheNameOfTheGame » Fri Feb 12, 2016 8:35 pm

Are you amiable to a Falcon version at this point or is that pretty much out of the equation?

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Re: New Atari PSU in the making

Postby Atari74user » Fri Feb 12, 2016 8:36 pm

Well, I imagine one of them could be me. While I cannot make up my mind with a few upgrades, thought I would go for a new PSU which does look quite beautiful. Quite excited to fit this to my STFM, and looking forward to Alan H's Unicorn USB which I had forgotten about until he posted about dropping the price.

Again, just happy we have people that create such upgrades and hardware to make our Ataris more pleasing to use.
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Re: New Atari PSU in the making

Postby exxos » Fri Feb 12, 2016 9:13 pm

Atari74user wrote:Well, I imagine one of them could be me. While I cannot make up my mind with a few upgrades, thought I would go for a new PSU which does look quite beautiful. Quite excited to fit this to my STFM, and looking forward to Alan H's Unicorn USB which I had forgotten about until he posted about dropping the price.

Again, just happy we have people that create such upgrades and hardware to make our Ataris more pleasing to use.
:cheers:


I enjoy doing them, Takes me 500% of my free time though :lol: I will keep doing kits while there is some interest in the stuff.

TheNameOfTheGame wrote:Are you amiable to a Falcon version at this point or is that pretty much out of the equation?


I think that question got asked at some point before, Strangely, the STFM pulls about the same current as a stock Falcon so other than a cable change for the Falcon, it will work fine. The only issue is the Falcon PSU connector is to the right of the PSU, the ST is at the front end of the board. so the Falcon will need some longer cables. I don't think its worth doing a new PCB layout just for the sake of using a slightly longer cable though.

Got the bulk of the assembly done today. Given them all a quick test and they are working. Hopefully can get them finished off next week :)
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Re: New Atari PSU in the making

Postby Atari74user » Fri Feb 12, 2016 9:34 pm

The sexy six! Well OK maybe I need to get out more, but looking good nonetheless!
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Re: New Atari PSU in the making

Postby exxos » Mon Feb 15, 2016 2:46 pm

Would there be any interest in a PSU for a machine like the MSTE ? The cost would likely be double the price of the ST one as its more amps and has negative voltages. Though I am looking to try out some new switchmode designs. Long term, if I can get the design small enough, I would probably re-design the ST PSU. The ST-redesign probably won't happen as I have over 30 PSU PCB's left yet. Though I do wonder about other machines as they are hard to get ahold of.
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Re: New Atari PSU in the making

Postby rpineau » Mon Feb 15, 2016 6:02 pm

Me (MSTE) :)
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Re: New Atari PSU in the making

Postby exxos » Mon Feb 15, 2016 6:18 pm

rpineau wrote:Me (MSTE) :)


...and I spent all day today looking at switching regulators, so I wonder who to blame for that :)
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Re: New Atari PSU in the making

Postby DarkLord » Mon Feb 15, 2016 6:21 pm

Don't forget - those Mega STe P/S's are quite a bit different - remember the ones I sent you?

Or were you just going to do a redesign (better)?

I'd be interested in a good backup. :)
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Re: New Atari PSU in the making

Postby rpineau » Mon Feb 15, 2016 6:27 pm

exxos wrote:
rpineau wrote:Me (MSTE) :)


...and I spent all day today looking at switching regulators, so I wonder who to blame for that :)


Me :)

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Re: New Atari PSU in the making

Postby exxos » Mon Feb 15, 2016 6:33 pm

DarkLord wrote:Don't forget - those Mega STe P/S's are quite a bit different - remember the ones I sent you?
Or were you just going to do a redesign (better)?
I'd be interested in a good backup. :)


Yeah, those ones you sent were right nasty bits of kit :) Rodolphe mentioned 7amps for the 5V rail, 2amps on 12V rail, about 500mA for -12 and -5V. I don't have a MSTE, so not really sure about them.

The ST PSU uses integrated regulators, so the design is small and simple, but no use for 7+amps current. Only solution is a total re-design. I would design the PSU with at least 10amps in mind for the 5V rail.

Problem is, almost all switching controllers are like stonage specifications. Its good they stood the test of time, but technology which is 10-20 years old! :roll: Some chips have like 600mV (0.6V) best regulation on 10amps, thats terrible. A buggered ST PSU would have better regulation than that :lol:

Some are better at like 15mV/A but thats still 150mV (0.15V). It seems hard to find anything to better that. I think because they are "old-tech" they are slow in switching, so give poor regulation. Design examples are very outdated using mosfets with poor spec these days. So its really hard to find something "good".

I have considered just building a controller out of a few chips, I've done it before, though it takes up a lot of board space and then assembly and parts count goes up which isn't ideal. I'm still looking for a good controller, got my eye on one actually which looks interesting. Generally just looking for the most expensive controllers and not even bothering to look at the cheaper ones now :)
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Re: New Atari PSU in the making

Postby DarkLord » Mon Feb 15, 2016 8:39 pm

Well, good luck. Mark me down for one as a backup for mine here when you do
get around to them.

PS As much as you are involved in Chris, I'm beginning to suspect that you really
are using clones and/or time travel! :)
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Re: New Atari PSU in the making

Postby exxos » Mon Feb 15, 2016 8:41 pm

DarkLord wrote:Well, good luck. Mark me down for one as a backup for mine here when you do
get around to them.

PS As much as you are involved in Chris, I'm beginning to suspect that you really
are using clones and/or time travel! :)


:lol: Either that or I get side-track on a hourly basis ;) What I "aim" to do each day never tallys with what I "actually" do :roll: :lol:
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Re: New Atari PSU in the making

Postby exxos » Wed Feb 24, 2016 10:22 pm

Just a small update here, I still have some orders to finish off. Sorry for the delays, but with multiple projects going on all at once , everything is taking its time to complete lately. The transformers arrived today, thats pretty much last thing to fit on this batch. I will try and get them built for this weekend and try to test them out next week. I've been really busy with regular work these past couple of weeks so my free time hasn't been much :(
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Re: New Atari PSU in the making

Postby Atari74user » Thu Feb 25, 2016 1:07 pm

No problem whatsoever!
:cheers:
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Re: New Atari PSU in the making

Postby frost » Tue Mar 08, 2016 12:58 pm

Count me in for a Mega STe PSU. Do you still have some "ST" ones left ? I may order one for my Mega 1.
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Re: New Atari PSU in the making

Postby exxos » Tue Mar 08, 2016 1:58 pm

frost wrote:Count me in for a Mega STe PSU. Do you still have some "ST" ones left ? I may order one for my Mega 1.


I have 4 PCB's built up, just needing transformer. I build them as they are sold as they are time consuming to build. So they will always likely be "pre-ordering". Typically 1-2weeks.

I'm still working on the MSTE design, I got the PCB for the 5V and 12V simulated and designed, then decided I didn't like it, so ripped it up and started again :roll: :lol:

I think there may be a space restriction in the MSTE PSU for a transformer, but looking at the internals of the MSTE, the PSU board could probably extended further forward than it would do normally. Main problem is I don't have a MSTE to measure up and work out how its going to fit together, so not really sure what to do about that currently.
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Re: New Atari PSU in the making

Postby rpineau » Tue Mar 08, 2016 4:18 pm

Well.. don't extend it toward the front .. you'll bump in my 68020 card :)
You can go wider if needed, but not longer and actually shorter would be good.
I'll email you picture and dimension :)
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Re: New Atari PSU in the making

Postby Atari74user » Tue Mar 08, 2016 4:30 pm

Big thank you for the PSU by the way. A beautiful creation. Just need time to fit it now!
:cheers:
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Re: New Atari PSU in the making

Postby exxos » Tue Mar 08, 2016 4:44 pm

Atari74user wrote:Big thank you for the PSU by the way. A beautiful creation. Just need time to fit it now!
:cheers:


Glad you like it :) They are slowly finding their way into my ST's here :)

rpineau wrote:Well.. don't extend it toward the front .. you'll bump in my 68020 card :)
You can go wider if needed, but not longer and actually shorter would be good.
I'll email you picture and dimension :)


That would be useful :) The main PCB is about 10cm x 10cm, but there is also similar size for the transformer, plus even larger to generator negative voltages, so space I think will be huge issue.
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Re: New Atari PSU in the making

Postby DarkLord » Tue Mar 08, 2016 7:03 pm

exxos wrote:I'm still working on the MSTE design, I got the PCB for the 5V and 12V simulated and designed, then decided I didn't like it, so ripped it up and started again :roll: :lol:

I think there may be a space restriction in the MSTE PSU for a transformer, but looking at the internals of the MSTE, the PSU board could probably extended further forward than it would do normally. Main problem is I don't have a MSTE to measure up and work out how its going to fit together, so not really sure what to do about that currently.


Should have that problem taken care of in a week or two... :angel:
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Re: New Atari PSU in the making

Postby exxos » Tue Mar 08, 2016 7:13 pm

DarkLord wrote:Should have that problem taken care of in a week or two... :angel:


Nice :) Meanwhile , maybe I can catch up on some sleep, Pretty sure I can remember how to do it....
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Re: New Atari PSU in the making

Postby exxos » Sun Mar 13, 2016 9:59 pm

Thanks very much for the current orders :) Been laid up with flu this past week, so only just starting to catch up with stuff again. Transformers on order (just ordered them) its the only thing left to do on this batch, other than give them a good test that is!

The MSTE design is looking a bit problematical at the moment , I fear there is going to be a space restriction to fit a transformer and the switchmode PCB. I will know more in a few weeks time when I can measure things up better. I've been having some prices back for a custom transformer, but it would cost around £100 just for that alone. So if I can't get the PCB and transformer to fit, then the only option would be a external power brick like used for the picopsu stuff, which isn't ideal by far.

I could design a new total switchmode design, though its likely I would still have to get a switchmode transformer designed anyway, so Its not really viable to go in that direction. The only other solution is to try and find some off the shelf PC type supply which will deliver the required amps in a small footprint, and then I would just have to design a small board to generate the negative voltages. So I think that idea will have to be plan B:

I could do with knowing how much space is above the PSU before it hits the top of the case. The toroidal is going to take up all the height in the PSU box, so if there is about 2-3cm above the PSU (and under the top of the MSTE case) then possible the PCB could be mounted above the PSU.

Once I have a PSU here to measure up, I will of course try my best to get it to fit, but its going to be tough I think and likely will need some more space around the PSU somewhere aswell.
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