520ST PSU Remake

Repairs & upgrades.
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rubber_jonnie
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Re: 520ST PSU Remake

Post by rubber_jonnie » Wed Mar 27, 2019 5:24 pm

This will be important going forward :)
Power_In.jpg
Power_In.jpg (11.79 KiB) Viewed 738 times
I have the machine running on 5v at present, but having traced the 12v lines, they're definitely connected, so I think the machine needs 12v to run properly.
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

tzok
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Re: 520ST PSU Remake

Post by tzok » Wed Mar 27, 2019 6:21 pm

As far As I remember it needs +/-12V solely for UART (RS232/MIDI), and of course +12V also for floppy. Good thing is, a custom PSU may have two plugs - one for ST and one for SF floppy.

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rubber_jonnie
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Re: 520ST PSU Remake

Post by rubber_jonnie » Thu Mar 28, 2019 10:16 am

tzok wrote:
Wed Mar 27, 2019 6:21 pm
As far As I remember it needs +/-12V solely for UART (RS232/MIDI), and of course +12V also for floppy. Good thing is, a custom PSU may have two plugs - one for ST and one for SF floppy.
Indeed, I did trace the 12v lines to the UART. I don't have an external SF, but I do have an external DATEL drive, which I could power from the PSU no problem, so something I'll certainly consider.
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

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rubber_jonnie
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Re: 520ST PSU Remake

Post by rubber_jonnie » Tue Apr 02, 2019 11:45 am

Adding to the list of parts, I now have 2 of these: https://www.ebay.co.uk/itm/Black-Power- ... 2749.l2649 at a cost of £2.39.

Internal diameter is 6.5 mm. The original case design on Thingiverse called for white, but I'll be printing in black, since that's the filament I have, and I think its closer to the original Atari PSU.

I've also bought 2M of this: https://www.ebay.co.uk/itm/12V-24V-2-3- ... 2749.l2649 at a cost of £4.39.

I've gone for 4 core cable, since there are 2 shared 5v pins and 2 shared GND pins, so only 4 wires are needed, plus at 14A it is way over the spec of what the PSU can deliver.
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

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rubber_jonnie
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Re: 520ST PSU Remake

Post by rubber_jonnie » Sat Apr 06, 2019 4:19 pm

So, here it is in all it's glory!

Todays work involved making the Molex plugs up for the mains in, and the power out lead, which was a Molex plug on the PSU end of the lead, and the 7 pin DIN plug.
IMG_20190406_160158.jpg
IMG_20190406_160158.jpg (299 KiB) Viewed 665 times
All required voltages were tested at the plug prior to connecting and powering up, but all is 100% fine, so I just need to print the case, do the final assembly and the job is done.

Here it is powered uo:
IMG_20190406_160041.jpg
IMG_20190406_160041.jpg (232.25 KiB) Viewed 657 times
Total cost of parts so far has been £49.63. I reused an old mains lead that I had that was surplus to requirements, so if you add the cost of that and the 3d Printed case, plus the DIN plugs I already had, the total price is about £55.

So far the only snags I've hit are that I ordered 2 pin Molex plugs for the mains lead connection. Wrong, it has 2 pins, but is spaced for 3 pin, so I cut down one of the 6 pin plugs I had to get around that. The other was the 7 pin DIN plug. The black plastic sheath that goes around it is too long, but the solution is simply to cut it down with scissors or a knife by about 10-12mm, which is enough to allow the plug part to protrude enough to plug nicely into the Atari power jack.
Attachments
productattachments_files_p_t_pt-65_datasheet.zip
(424.67 KiB) Downloaded 20 times
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

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rubber_jonnie
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Re: 520ST PSU Remake

Post by rubber_jonnie » Sun Apr 14, 2019 11:54 am

With a bit of tweaking, I have shaved and hour of the print time for each the case halves.

Files are attached and will also go into the 3d models section.
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

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PhilC
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Re: 520ST PSU Remake

Post by PhilC » Sun Apr 14, 2019 12:24 pm

Any pics of the printed case?
If it ain't broke, test it to Destruction.

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rubber_jonnie
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Re: 520ST PSU Remake

Post by rubber_jonnie » Sun Apr 14, 2019 12:42 pm

PhilC wrote:
Sun Apr 14, 2019 12:24 pm
Any pics of the printed case?
There will be as soon as I've finished printing both halves.
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

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rubber_jonnie
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Re: 520ST PSU Remake

Post by rubber_jonnie » Sun Apr 14, 2019 9:06 pm

PhilC wrote:
Sun Apr 14, 2019 12:24 pm
Any pics of the printed case?
Just to tease you, lower half currently printing :)
IMG_20190414_194130.jpg
IMG_20190414_194130.jpg (283.1 KiB) Viewed 567 times
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

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PhilC
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Re: 520ST PSU Remake

Post by PhilC » Sun Apr 14, 2019 9:21 pm

How long to print in total?
If it ain't broke, test it to Destruction.

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