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/  Forum Index
   /  Classic Amiga Hardware
      /  PSU/ATX
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PosterThread
tangoone 
PSU/ATX
Posted on 17-Jul-2016 11:08:54
#1 ]
Regular Member
Joined: 2-Jul-2014
Posts: 152
From: Norway

I like to replace my cbm psu with a ATX PSU.

So when buying a power supply is't anything I must remember. ?

Is 350w ok. ?

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Severin 
Re: PSU/ATX
Posted on 17-Jul-2016 12:09:40
#2 ]
Elite Member
Joined: 18-Aug-2003
Posts: 2740
From: Gloucestershire UK

@tangoone

350w is about the top of the range, better to use a 250 if you can find one. classics use so little power that finding a PSU that will run smoothly at such a low current draw can be a problem.

Personally I would try and find an old AT PSU (one with a physical on/off switch) that's around 150-250w.

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tangoone 
Re: PSU/ATX
Posted on 17-Jul-2016 12:29:08
#3 ]
Regular Member
Joined: 2-Jul-2014
Posts: 152
From: Norway

@Severin

350w is about the lowest I have found. (corsair)

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KermitTheFrogman 
Re: PSU/ATX
Posted on 17-Jul-2016 13:25:31
#4 ]
Member
Joined: 6-Jun-2004
Posts: 99
From: Glos,UK

@tangoone

I have found that loading the PSU by connecting an old hard drive helps
to get it stable if the draw is too low. No need for the data cable, just power.

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Severin 
Re: PSU/ATX
Posted on 17-Jul-2016 14:09:00
#5 ]
Elite Member
Joined: 18-Aug-2003
Posts: 2740
From: Gloucestershire UK

@tangoone

Have you got or made the adaptor board to turn on an ATX psu?

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tangoone 
Re: PSU/ATX
Posted on 17-Jul-2016 14:26:04
#6 ]
Regular Member
Joined: 2-Jul-2014
Posts: 152
From: Norway

@Severin

http://www.ebay.com/itm/Commodore-Amiga-ATX-PSU-Dongle-Adapter-with-plug-NEW-VERSION-/222182722057?hash=item33bb1f4a09:g:gS0AAOSw~gRVqRXO

Anyone have used this and can tell me if it works. ?

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kolla 
Re: PSU/ATX
Posted on 17-Jul-2016 14:48:44
#7 ]
Elite Member
Joined: 20-Aug-2003
Posts: 2859
From: Trondheim, Norway

@tangoone

In general, using ATX power supplies is a big no-no. Current ATX PSUs are made for motherboards running on 3.3V, CBM Amiga motherboards requires 5V. The 5V you get from current ATX PSUs is mostly there for "mechanical use", for peripherals etc, and may not be of the quality (in terms of steady voltage, reliable amp, ripples) that you want for the Amiga motherboard.

Older ATX PSUs, built for the days when motherboards were running on 5V, are much better, but rare to find these days. Best is to buy PSU built for Amiga, or if you want to use modern ATX PSU, also get a regulator that "cleans up" the 5V line (and typically also provide an on/off button).

You have not stated what Amiga you want this for :)

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tangoone 
Re: PSU/ATX
Posted on 17-Jul-2016 14:52:01
#8 ]
Regular Member
Joined: 2-Jul-2014
Posts: 152
From: Norway

@kolla

My plan it is to power my A500 and A1200 with this.

So how or what do I need to use a modern ATX PSU 350W+ on any of these models since my CBM psu is starting to get very old.

So what do I do. ?

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g01df1sh 
Re: PSU/ATX
Posted on 17-Jul-2016 21:04:27
#9 ]
Super Member
Joined: 16-Apr-2009
Posts: 1777
From: UK

@tangoone

I'm using one of the atx adapters works OK would be nice if it had header for on off button on the front of modern towers

_________________
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Elbox empty Power Tower
RPi3 Emulating C64 ZX Atari PS BBC
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tangoone 
Re: PSU/ATX
Posted on 18-Jul-2016 8:01:44
#10 ]
Regular Member
Joined: 2-Jul-2014
Posts: 152
From: Norway

@g01df1sh

What sort of ATX PSU do you use (power). ?

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g01df1sh 
Re: PSU/ATX
Posted on 18-Jul-2016 9:46:56
#11 ]
Super Member
Joined: 16-Apr-2009
Posts: 1777
From: UK

@tangoone

Just a standard nothing fancy pc one. did have a real cheap shity thing but that caused issue at the connection plug. so I have replaced that with a bit better one. Am thinking of changing it again to a nice corsair modular one so I have less cables.

Last edited by g01df1sh on 18-Jul-2016 at 09:47 AM.

_________________
A1200 ACA1232 128MB Indivison MkIICr
Elbox empty Power Tower
RPi3 Emulating C64 ZX Atari PS BBC
Wii with Amiga emulation
Vampire v4 SA

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Thorham 
Re: PSU/ATX
Posted on 18-Jul-2016 10:14:24
#12 ]
Regular Member
Joined: 5-Mar-2014
Posts: 183
From: Unknown

NEVER buy cheap PSUs.

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Severin 
Re: PSU/ATX
Posted on 18-Jul-2016 10:18:16
#13 ]
Elite Member
Joined: 18-Aug-2003
Posts: 2740
From: Gloucestershire UK

@tangoone

If you have a version of freecycle where you are put up a request for ancient pc parts, I did it last year and got 3 AT PSUs.

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A1200 
Re: PSU/ATX
Posted on 18-Jul-2016 11:33:18
#14 ]
Elite Member
Joined: 5-May-2003
Posts: 3087
From: Westhall, UK

I have an a1200 / 030 / external floppy drive and it runs fine on a Corsair 550w silent PSU. I got the ATX adaptors from the guy on eBay and have had zero issues with stability.

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A1200 
Re: PSU/ATX
Posted on 18-Jul-2016 11:36:51
#15 ]
Elite Member
Joined: 5-May-2003
Posts: 3087
From: Westhall, UK

@g01df1sh

Quote:

g01df1sh wrote:
@tangoone

Just a standard nothing fancy pc one. did have a real cheap shity thing but that caused issue at the connection plug. so I have replaced that with a bit better one. Am thinking of changing it again to a nice corsair modular one so I have less cables.


The modular one is what I went for. Proper smart - so expensive it comes in a bag - who needs a bag for a PSU? Anyway, this is the model I went for:

Corsair RM550X

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g01df1sh 
Re: PSU/ATX
Posted on 18-Jul-2016 15:16:55
#16 ]
Super Member
Joined: 16-Apr-2009
Posts: 1777
From: UK

@A1200

I Agree 100% cheap psu are big no they cause so many issues.

_________________
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Elbox empty Power Tower
RPi3 Emulating C64 ZX Atari PS BBC
Wii with Amiga emulation
Vampire v4 SA

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