Choosing a new ATX power supply for an expanded Amiga 4000 - Page 6

grelbfarlk · 21 February 2020, 04:25

It's fine if it's thinner wire to 3 different pins on the ATX connector, I mean that's half the reason of doing it, to closer match the 14 gauge or maybe it's 12 gauge wire on the original Lite On PSU. You'll have a very hard time connecting the 14 ga wire to a single ATX pin, which part of the reason of using thinner but multiple wires. Then you think about the connections it's making the actual mating surfaces. As I've mentioned the A4000 PSU connector every one I've seen in the past 5 years, the actual mating surface inside of the female connector was quite dirty with oxidation. I've been making the adapters from common Digikey parts for a while now but using the slightly more expensive gold pins and A4000 connectors.
It's also why people had the idea of adding supplemental 5V connections to the Mediator or PPC board-those are going straight to the ATX PSU not through the A4000 motherboard connector. Same principle just doing it in another way, and seems to work or the placebo effect is very strong. Which is just another way of using a floppy connector (or something) plugged directly into the CSPPC fan header.
The A4000D Tower conversion from Elbox is also good in this way as it has that P9 connector on the busboard(though some versions are less robust), less dicking about is usually needed there, and you can just use a normal size ATX power supply instead of an SFX one.

spudje · 21 February 2020, 09:34

Quote:

Originally Posted by AC/DC HACKER!

That's what I'm starting to suspect. Your last sentence. My CSPPC's zer060 @ 65.4 PPC @ 359 MHz. Vs the common 200 MHz.

Mmm, I believe mine is overclocked as well. A rev 4 CSPPC with 366MHz, 060 (rev 6) is clocked at 66MHz. However why would my system show the same behaviour with a Sonnet PPC card (and the CSPPC still mounted for 060).

Is it a matter of changing the crystal (what crystal would I need) to have it run at stock speed, which would be what?

I'll check on A1k for a modified ATX adapter.

AC/DC HACKER! · 10 March 2020, 06:21

I'd like to k now what you find at A1K. I've been very busy with some other stuff to check there.

spudje · 10 March 2020, 09:46

March is a very expensive month. I'm waiting some weeks before I take on this PSU challenge.

Kin Hell · 10 March 2020, 11:52

Another interesting option Guys.

https://www.thefuturewas8bit.com/a4000psu-upgrade

turboknekten · 11 March 2020, 15:38

Hi guys,
For those interested I will upload the 3D-CAD file of the adapter you see in the pictures to GrabCAD. Will come back with link later.

What you see in the pictures is a Corsair SF450 ATX PSU + a laser-cutted sheet metal part. Other parts used is an A4000 ATX PSU adapter cable from Amigakit and a 24-pin to 20-pin converter cable. I used that cable between the Amigakit adapter cable and Corsair PSU.

Material is 1mm stainless steel.

DarrenHD · 11 March 2020, 15:48

Quote:

Originally Posted by turboknekten

Hi guys,
For those interested I will upload the 3D-CAD file of the adapter you see in the pictures to GrabCAD. Will come back with link later.

What you see in the pictures is a Corsair SF450 ATX PSU + a laser-cutted sheet metal part. Other parts used is an A4000 ATX PSU adapter cable from Amigakit and a 24-pin to 20-pin converter cable. I used that cable between the Amigakit adapter cable and Corsair PSU.

Material is 1mm stainless steel.

That's pretty cool, especially with the extra fan at the back. I'm using the 3D printed part myself, but it doesn't have the extra fan at the back...but i can probably make a hole for one.

Daedalus · 11 March 2020, 16:37

The extra fan is important with modern PSUs if you don't mod them, as the PSU fan is the only air circulation the entire machine gets. When I did this mod in the past I modded the PSU to run the fan constantly, which makes it noisier but still quieter than the original PSU and fan. A small, separate fan is a nice alternative.

DarrenHD · 11 March 2020, 18:04

Quote:

Originally Posted by Daedalus

The extra fan is important with modern PSUs if you don't mod them, as the PSU fan is the only air circulation the entire machine gets. When I did this mod in the past I modded the PSU to run the fan constantly, which makes it noisier but still quieter than the original PSU and fan. A small, separate fan is a nice alternative.

I think with the SF450 it controls it's own fan, and the fan can totally shut off if the temp or load isn't high enough, so yes, having that extra fan is important...I will have to do something...

turboknekten · 11 March 2020, 19:14

Here is the 3D-file if anyone want to use it.
It is in STEP format.

DarrenHD · 14 March 2020, 03:22

Here are two quick photos of my setup I'm building. I will post more in a separate Alice+ thread under hardware pics.

Amiga 4000 Alice+
AmigaKit ATX adapter
SF450 power supply
3D printed holder

Soon I will add a GREX 4000 and Cyberstorm PPC.

Attachment 66454

Attachment 66455

turboknekten · 14 March 2020, 09:31

First 3D-model I made for my solution was also a plastic part. But I was worried that the vertical arm where the on/off switch is assembled was going to be to weak.
Does the arm flex in your part?

What type of 3D-printer do you have?

spudje · 14 March 2020, 12:50

Quote:

Originally Posted by turboknekten

A4000 ATX PSU adapter cable from Amigakit and a 24-pin to 20-pin converter cable. I used that cable between the Amigakit adapter cable and Corsair PSU.

Do you use that just to get more length, or other reason as well? And no further modding on the ATX adapter to get more 5V amps to the A4k?

turboknekten · 14 March 2020, 18:53

Quote:

Originally Posted by spudje

Do you use that just to get more length, or other reason as well? And no further modding on the ATX adapter to get more 5V amps to the A4k?

No modding at all. The 24-pin to 20-pin converter cable added 15cm extra length. I could not find anyone that was shorter. I didn´t want to modify the cables and there was enough space under the ATX PSU for hiding the extra length. This was the reason I added the cut outs for cable ties at the side.

DarrenHD · 14 March 2020, 19:59

Quote:

Originally Posted by turboknekten

First 3D-model I made for my solution was also a plastic part. But I was worried that the vertical arm where the on/off switch is assembled was going to be to weak.
Does the arm flex in your part?

What type of 3D-printer do you have?

I don't have one. I ordered it online using the link Trixster posted earliet in the thread. There is some flex when I press the power button, but not much and it works great!

AC/DC HACKER! · 14 March 2020, 20:02

Quote:

Originally Posted by turboknekten

Hi guys,
For those interested I will upload the 3D-CAD file of the adapter you see in the pictures to GrabCAD. Will come back with link later.

What you see in the pictures is a Corsair SF450 ATX PSU + a laser-cutted sheet metal part. Other parts used is an A4000 ATX PSU adapter cable from Amigakit and a 24-pin to 20-pin converter cable. I used that cable between the Amigakit adapter cable and Corsair PSU.

Material is 1mm stainless steel.

When you add the CyberstormPPC and run some PPC programs for over 30 to 60 minutes I want to know if you notice any crashes or locks. If not, then I'm wondering about the Amiga-Kit adapter I have for my SF450.

What connection is that between the Amiga-Kit adapter and the SF450?

turboknekten · 15 March 2020, 16:16

When reading about the Amigakit adapter you make me worried.
My installation is quite new. So far I have the 3.1.4 installation working with Mediator/P96/WarpUP.

I downloaded this mandelbrot software from Aminet.
http://aminet.net/package/gfx/fract/FlashMandelWOS
Trying to zoom in/out, change iterations for 15-20min.

After that I started AmiAMP. I have change so it use PPC mpeg library. When writing it has been running nearly 35min.

The adapter I use is this. It is 25cm in length. Not 15cm as I wrote earlier.
https://www.dustinhome.se/product/50.../power-adapter

Any suggestion of programs I can test?
I am also curious if I get any lock ups.

DarrenHD · 15 March 2020, 17:57

Quote:

Originally Posted by AC/DC HACKER!

When you add the CyberstormPPC and run some PPC programs for over 30 to 60 minutes I want to know if you notice any crashes or locks. If not, then I'm wondering about the Amiga-Kit adapter I have for my SF450.

What connection is that between the Amiga-Kit adapter and the SF450?

The Amigakit adapter goes into the 20-pin ATX power connector of the SF450.

I have my A4000 system with 030, Mediator, ATI Radeon 9250, CF card for hard drive, and the SF450 fan has not come on once...the system is running totally silent, it's sort of weird...

I hope once I add the CS PPC, a real UW SCSI drive, etc, it drives more load on the power supply and the fan kicks in. Regardless I will need to add extra fans to keep it cool inside and make a hole at the back of the case for it.

Daedalus · 15 March 2020, 18:22

Yep, when I fitted an SF450 to an A4000 before, I modded the PSU itself to have the fan running full time because that's the only source of airflow for the whole A4000. As for the ATX 24-20 adaptor, that shouldn't be necessary at all since most PSUs offer optional 20/24-pin configurations, and the 20-pin plug will fit a 24-pin socket fine. 24-pin plugs also fit 20-pin sockets if there's enough space beyond the end to accommodate the overhang.

DarrenHD · 15 March 2020, 18:37

Quote:

Originally Posted by Daedalus

Yep, when I fitted an SF450 to an A4000 before, I modded the PSU itself to have the fan running full time because that's the only source of airflow for the whole A4000. As for the ATX 24-20 adaptor, that shouldn't be necessary at all since most PSUs offer optional 20/24-pin configurations, and the 20-pin plug will fit a 24-pin socket fine. 24-pin plugs also fit 20-pin sockets if there's enough space beyond the end to accommodate the overhang.

Thanks. Is it easy to mod the sf450 so the fan always be on?

11 March 2020, 15:38	#106
turboknekten Registered User Join Date: Aug 2019 Location: Lidköping/Sweden Posts: 28	Hi guys, For those interested I will upload the 3D-CAD file of the adapter you see in the pictures to GrabCAD. Will come back with link later. What you see in the pictures is a Corsair SF450 ATX PSU + a laser-cutted sheet metal part. Other parts used is an A4000 ATX PSU adapter cable from Amigakit and a 24-pin to 20-pin converter cable. I used that cable between the Amigakit adapter cable and Corsair PSU. Material is 1mm stainless steel. Attached Thumbnails

14 March 2020, 03:22	#111
DarrenHD Registered User Join Date: Aug 2008 Location: London / Canada Posts: 781	Here are two quick photos of my setup I'm building. I will post more in a separate Alice+ thread under hardware pics. Amiga 4000 Alice+ AmigaKit ATX adapter SF450 power supply 3D printed holder Soon I will add a GREX 4000 and Cyberstorm PPC. Attachment 66454 Attachment 66455 Last edited by DarrenHD; 21 April 2020 at 23:13.

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21 February 2020, 04:25	#101
grelbfarlk Registered User Join Date: Dec 2015 Location: USA Posts: 2,902	It's fine if it's thinner wire to 3 different pins on the ATX connector, I mean that's half the reason of doing it, to closer match the 14 gauge or maybe it's 12 gauge wire on the original Lite On PSU. You'll have a very hard time connecting the 14 ga wire to a single ATX pin, which part of the reason of using thinner but multiple wires. Then you think about the connections it's making the actual mating surfaces. As I've mentioned the A4000 PSU connector every one I've seen in the past 5 years, the actual mating surface inside of the female connector was quite dirty with oxidation. I've been making the adapters from common Digikey parts for a while now but using the slightly more expensive gold pins and A4000 connectors. It's also why people had the idea of adding supplemental 5V connections to the Mediator or PPC board-those are going straight to the ATX PSU not through the A4000 motherboard connector. Same principle just doing it in another way, and seems to work or the placebo effect is very strong. Which is just another way of using a floppy connector (or something) plugged directly into the CSPPC fan header. The A4000D Tower conversion from Elbox is also good in this way as it has that P9 connector on the busboard(though some versions are less robust), less dicking about is usually needed there, and you can just use a normal size ATX power supply instead of an SFX one.

10 March 2020, 06:21	#103
AC/DC HACKER! Registered User Join Date: Aug 2016 Location: Earth Posts: 884	I'd like to k now what you find at A1K. I've been very busy with some other stuff to check there.

10 March 2020, 09:46	#104
spudje Registered User Join Date: Dec 2014 Location: Netherlands Posts: 1,406	March is a very expensive month. I'm waiting some weeks before I take on this PSU challenge.

10 March 2020, 11:52	#105
Kin Hell 0ld0r Git Join Date: Mar 2009 Location: Cornwall, UK Posts: 1,570	Another interesting option Guys. https://www.thefuturewas8bit.com/a4000psu-upgrade

11 March 2020, 16:37	#108
Daedalus Registered User Join Date: Jun 2009 Location: Dublin, then Glasgow Posts: 6,334	The extra fan is important with modern PSUs if you don't mod them, as the PSU fan is the only air circulation the entire machine gets. When I did this mod in the past I modded the PSU to run the fan constantly, which makes it noisier but still quieter than the original PSU and fan. A small, separate fan is a nice alternative.

14 March 2020, 09:31	#112
turboknekten Registered User Join Date: Aug 2019 Location: Lidköping/Sweden Posts: 28	First 3D-model I made for my solution was also a plastic part. But I was worried that the vertical arm where the on/off switch is assembled was going to be to weak. Does the arm flex in your part? What type of 3D-printer do you have?

15 March 2020, 16:16	#117
turboknekten Registered User Join Date: Aug 2019 Location: Lidköping/Sweden Posts: 28	When reading about the Amigakit adapter you make me worried. My installation is quite new. So far I have the 3.1.4 installation working with Mediator/P96/WarpUP. I downloaded this mandelbrot software from Aminet. http://aminet.net/package/gfx/fract/FlashMandelWOS Trying to zoom in/out, change iterations for 15-20min. After that I started AmiAMP. I have change so it use PPC mpeg library. When writing it has been running nearly 35min. The adapter I use is this. It is 25cm in length. Not 15cm as I wrote earlier. https://www.dustinhome.se/product/50.../power-adapter Any suggestion of programs I can test? I am also curious if I get any lock ups.

15 March 2020, 18:22	#119
Daedalus Registered User Join Date: Jun 2009 Location: Dublin, then Glasgow Posts: 6,334	Yep, when I fitted an SF450 to an A4000 before, I modded the PSU itself to have the fan running full time because that's the only source of airflow for the whole A4000. As for the ATX 24-20 adaptor, that shouldn't be necessary at all since most PSUs offer optional 20/24-pin configurations, and the 20-pin plug will fit a 24-pin socket fine. 24-pin plugs also fit 20-pin sockets if there's enough space beyond the end to accommodate the overhang.

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