New Atari PSU in the making

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Re: New Atari PSU in the making

Postby exxos » Sun Mar 20, 2016 12:13 pm

Thanks to Darklord for donating a MSTE PSU to the cause :cheers:

Preliminary the intended custom 120va transformer would take up the whole internal of the case, meaning there would need to be about 2cm height above the PSU to fit the PCB also. If someone can check the height from the top of the PSU to the case, then it would greatly help.

Though after a "brain fart" , I was looking for a 8+amp secondary for the 5V rail. In fact 8amps @ 5V= 40VA. or 12V @ 4amps = 48VA. The input voltage/amps isn't exactly important, its the VA in/out. For example would have a 40V 1amp secondary and still be 40VA. Of course efficiency factors into this, but wont go into all that now.

In anycase, the smaller transformer used on the STFM PSU has more than enough juice to power a MSTE needing 7amps (I doubt it uses more than 2-3amps anyway ?!) So this means about half the PSU case is now free. Though the total PCB area needs the full width/length of the PSU box, so height is still a issue even with a smaller transformer.

So I will see if I can get a custom one made with different dimensions than a regular toroidal . I have seen pretty flat toroidals in the past in audio equipment so they are possible to make. Though with £100 price tag on the transformer alone these are not going to be cheap to build. I am still looking for alternatives though..
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Re: New Atari PSU in the making

Postby Ragstaff » Thu Mar 24, 2016 4:54 am

exxos wrote:If someone can check the height from the top of the PSU to the case, then it would greatly help.

About 11mm of space between the top of the PSU and the case... probably 10mm to be safe (EDIT - note that in the pic I'm not measuring 17mm height of the case, but from the edge of the metal PSU shielding you can just see through the crack. In the pose for the pic the placement of the ruler by my shaky hand was 1mm off, but yes, it's 17mm ;-) )
MegaSTE_PSU1.jpg


Then about 24.5mm in from the edge of the case you should have another 7.5mm, totalling ~18mm of clearance
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Last edited by Ragstaff on Thu Mar 24, 2016 1:30 pm, edited 1 time in total.

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Re: New Atari PSU in the making

Postby exxos » Thu Mar 24, 2016 1:08 pm

Ragstaff wrote:About be 11mm of space between the top of the PSU and the case... probably 10mm to be safe (EDIT - note that in the pic I'm not measuring 17mm height of the case, but from the edge of the metal PSU shielding you can just see through the crack. In the pose for the pic the placement of the ruler by my shaky hand was 1mm off, but yes, it's 17mm ;-) )

Then about 24.5mm in from the edge of the case you should have another 7.5mm, totalling ~18mm of clearance


Thank you very much for posting that information, that really helps me plan it out! :cheers:
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Re: New Atari PSU in the making

Postby exxos » Mon Mar 28, 2016 11:26 pm

All current "exxos PSU's" have been shipped. Thanks to those who ordered one, really helps me fund future projects :)

Theres 2 PSU's left this batch (again still need to fit the transformer). I don't know when the next batch will be made with summer around the corner and fences need fixing etc :)
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Re: New Atari PSU in the making

Postby EstTeeEfEm » Tue Mar 29, 2016 12:02 am

I know you are probably already taking pre-orders lol, can you save me one? or are these built on a pre-paid request?

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Re: New Atari PSU in the making

Postby exxos » Tue Mar 29, 2016 7:59 am

EstTeeEfEm wrote:I know you are probably already taking pre-orders lol, can you save me one? or are these built on a pre-paid request?


They are basically built once payment comes. The current "batch" I made 5 PCB's up (excluding transformer and final testing) to save time on peoples pre-ordering times, but I don't have time to build up anymore batches of boards currently. Though if there is a order, then it will still get done, just take a lot longer.
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Re: New Atari PSU in the making

Postby EstTeeEfEm » Tue Mar 29, 2016 5:15 pm

Though if there is a order, then it will still get done, just take a lot longer.


Thats ok, just let me know when you're able to.. I've an STF that I wanted a new power supply for, maybe I might have to just buy a working one, or try one of your "psu" kits ?

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Re: New Atari PSU in the making

Postby TheNameOfTheGame » Tue Mar 29, 2016 5:29 pm

exxos wrote:All current "exxos PSU's" have been shipped. Thanks to those who ordered one, really helps me fund future projects :)

Theres 2 PSU's left this batch (again still need to fit the transformer). I don't know when the next batch will be made with summer around the corner and fences need fixing etc :)


Thanks, arrived today! :cheers:

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Re: New Atari PSU in the making

Postby exxos » Tue Mar 29, 2016 6:27 pm

EstTeeEfEm wrote:Thats ok, just let me know when you're able to.. I've an STF that I wanted a new power supply for, maybe I might have to just buy a working one, or try one of your "psu" kits ?


You can order the PSU whenever, I do have upgraded "atari" ones in my store aswell. Re-cap kits are ok if you are confident your not gonna screw something up, else you'll end up buying a new PSU anyway ;) You could send me your PSU to recap, but after postage, normally isn't worth it.


TheNameOfTheGame wrote:Thanks, arrived today! :cheers:


Awesome, Welcome to the "club" ;) :cheers:
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Re: New Atari PSU in the making

Postby EstTeeEfEm » Tue Mar 29, 2016 11:29 pm

You could send me your PSU to recap, but after postage, normally isn't worth it.

Probably isnt lol, however it does seem that the psu cuts outs intermittently so it could be an altogether different issue.

Now that I know i can upgrade my STFM with everything needed I might go ahead and take that guys offer on FB re the Toshiba chips. Its a little expensive but its the convenience of having an STFM that is one meg and can be plugged into nearly every Tv :P

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Re: New Atari PSU in the making

Postby exxos » Sun Apr 24, 2016 8:44 pm

I've started a new batch of 6 of the PSU's as I have a couple orders for them. So if anyone wants to order one without having to wait a few weeks, then now would be a good time :)

I am just waiting for the regulators to arrive (hopefully tomorrow) and then test them (and fit transformers).
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Re: New Atari PSU in the making

Postby exxos » Thu Apr 28, 2016 9:50 am

Current batch almost completed :)

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Re: New Atari PSU in the making

Postby exxos » Tue Jul 12, 2016 5:15 pm

Next batch in the making. Doing 16 this time as currently they are selling faster than I can make them! Hopefully this will keep me in stock of them for a while :) Thanks again to everyone who purchased one. :cheers:

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Re: New Atari PSU in the making

Postby exxos » Tue Aug 02, 2016 10:09 am

I hope to start shipping towards the end of the week or early next week. 4 of these are spoken for already! Apologies for those who are waiting for their order, life gets in the way of building stuff etc :)

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Re: New Atari PSU in the making

Postby charles » Thu Aug 18, 2016 9:40 pm

ive been away, regret not checking in on the forums!!,
for a while ,,,

any of these good for a ste /st/or mega st

im looking for populated psu .... maybe two ..!!
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Re: New Atari PSU in the making

Postby exxos » Fri Aug 19, 2016 7:34 am

charles wrote:ive been away, regret not checking in on the forums!!,
for a while ,,,

any of these good for a ste /st/or mega st

im looking for populated psu .... maybe two ..!!


They are for STE, STF/M, MEGA ST.

The PCB itself comes assembled and tested. You have to transplant the frame as shown in my guide. http://www.exxoshost.co.uk/atari/last/psu/index.htm#PSUFIT
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Re: New Atari PSU in the making

Postby charles » Fri Aug 19, 2016 1:43 pm

looks very impressive ,,, a glimpse of light for the older machines! ,,so cool exxos
guess pricing and availability is on your page?
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Re: New Atari PSU in the making

Postby exxos » Fri Aug 19, 2016 1:47 pm

charles wrote:looks very impressive ,,, a glimpse of light for the older machines! ,,so cool exxos
guess pricing and availability is on your page?


All prices are in my store.
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Re: New Atari PSU in the making

Postby mlynn1974 » Sat Aug 27, 2016 11:59 pm

I was wondering why your design uses a toroidial transformer instead of a standard transformer?
We had a toroidial tranformer in a light fitting in the house and it lasted at least 10 years whereas inline light transfomers (e.g. Marbo) tend to last about 4-5 years. The toroid also gave off a sort of hum sound when it was in use. Does your PSU do that?

I also read online that their major advantage is that they do not radiate much of a magnetic field -- a very useful property. Would it be possible to have your PSU in a neat external box? e.g. to reduce heat.
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Re: New Atari PSU in the making

Postby exxos » Sun Aug 28, 2016 8:43 am

mlynn1974 wrote:I was wondering why your design uses a toroidial transformer instead of a standard transformer?
We had a toroidial tranformer in a light fitting in the house and it lasted at least 10 years whereas inline light transfomers (e.g. Marbo) tend to last about 4-5 years. The toroid also gave off a sort of hum sound when it was in use. Does your PSU do that?

I also read online that their major advantage is that they do not radiate much of a magnetic field -- a very useful property. Would it be possible to have your PSU in a neat external box? e.g. to reduce heat.


Efficiency, size, cost, EM radiation.. there is info on my site as to "why" I went with various parts..

The PSU doesn't get as hot as the original one, putting it in a external box is likely to cause more heat problems.

However, I am working on a STM external PSU, but with so many projects on the go now mixed in with my store issues, everything is once again delayed :(
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Re: New Atari PSU in the making

Postby matej » Thu Nov 10, 2016 7:51 am

Hello Exxo. How much STFM PSU cost? Do you ship to Slovakia (EU/Eurozone)?

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Re: New Atari PSU in the making

Postby exxos » Thu Nov 10, 2016 7:55 am

matej wrote:Hello Exxo. How much STFM PSU cost? Do you ship to Slovakia (EU/Eurozone)?


All prices are in my store. They are out of stock currently, but I am working on a new batch.

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Re: New Atari PSU in the making

Postby exxos » Thu Nov 10, 2016 9:56 pm

I've done:
8x 240V.
6x 110V.

I still have some things to finish off, but they should be in my store around Wednesday next week :)

IMG_0567.JPG


These are the last of the original ST PSU design. Since I designed a more Falcon orientated PCB there was little use in keeping 2 designs in production , so the Falcon design will also double up as the ST PSU.

The Falcon design is very similar, but I have re-designed the PCB and used a much heavier weight copper. This got the regulation down to about 0.005V (5mV) P-P. IIRC the ST one was about 20mV (0.020). Though this doesn't mean much for the ST considering the regulation on the original PSU's was more like 0.2V (200mV).

Anyway, the Falcon PSU will be more expensive as the PCB price doubled. I've also started using larger capacitors which adds a little more expense. I suspect the price will add around £10 extra per board.

The Falcon version will also have the connector fitted. Though I am not sure how much more this will add to the cost yet as stripping /crimping/soldering cables gets really time consuming :roll: I would guess the cable part will add around £15 to the price tag. The ST versions will just be supplied as before without the cable.

Falcon PSU info here.
http://www.exxoshost.co.uk/atari/last/psu/index.htm#FALCPSU

Don't ask me when the Falcon PSU will appear, as I don't know. Next year definitely. Busy with some other kits right now so PSU's will have to wait :)
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Re: New Atari PSU in the making

Postby Ragstaff » Thu Nov 10, 2016 11:47 pm

Just want to say, fantastic work. I haven't ordered anything from you yet so haven't voted with my wallet (so to speak), but what it's worth! Hope to have something with that lovely, big "Made in Britain" sticker on it soon ;-)

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Re: New Atari PSU in the making

Postby exxos » Fri Nov 11, 2016 7:45 pm

Ragstaff wrote:Just want to say, fantastic work. I haven't ordered anything from you yet so haven't voted with my wallet (so to speak), but what it's worth! Hope to have something with that lovely, big "Made in Britain" sticker on it soon ;-)


I think the Made in Britain sticker is a bigger hit than the PSU itself :lol: :lol:

Thanks for your kind words though. I will keep producing stuff while there is demand. Though time for a small break from these PSU's as if I solder another toroidal transformer I may just lose my sanity 8)
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