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Power Supply for Atari Mega STE and TT computers
Replace the original PSM-5341 model

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Built with modern components, these power supplies are more powerful, more efficient and generate less heat.
They are designed to fit on the original Atari power supply support. It fit in the same space. You can place the shield back.

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They are ideal if you wish to swap your broken original PSU or to if you want more current to power additional devices such as a PiStorm, hard drive or acceleration card.

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They work on with input voltage of 110V or 230V

High efficient switched power supply.

Low heat dissipation

No noise

Short circuit protection

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Installation will require some soldering in order to disconnect the original PSU and reconnect the new one.

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They are compatible with Atari Mega STE and Atari TT computers. Replace the original PSM-5341 model
Even the connector for the fan is present.

 

Here are more details on the specifications:

How to Swap your old PSU for a new own?

Swapping your old PSU for one of these new one require some soldering. Nothing too complicate, but never the less requiring you to have a solder iron, some solder tin and some experience. Soldering iron must be 50 watts and set to max in order to solder the wires to the PCB.
The connector to the mother board will be used on the new PSU.

Safety warning first:

It is your responsibility to make sure you stay safe while working on your Atari and its PSU.


These PSU are intended to be used as a replacement PSU for Atari Mega ST.E and TT The new PSU MUST be fitted on the intended metal support you find in your Atari.
Do not use it without support and outside your Atari.

Do not touch the PSU when under power.
Unplug your Atari every time you open it.   

Do not attempt to service this new PSU.


Here is what you will need. The pump and 3rd hand are optional, but could come handy (photo may show a different PSU, required tools are the same):
 

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Once you removed your old PSU from your Atari Mega STE, follow these instructions:

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  1. Unscrew and remove the PSU shield.

  2. Unplug the fan connector from its header.

  3. Unscrew all 5 screws holding the PSU on the support. Keep these screws and the plastic film.

  4. With your soldering iron, unsolder the 2 AC cable. You apply heat on the solder pads and pull the wires from the other side

  5. Do the same with the motherboard connector. Heat the pads and pull the wires. Do it one by one.

  6. If you have a pump, heat the wire end of each wires and such the solder tin that may remain.

  7. With the new PSU and the motherboard cable you just saved, insert each wire into the pad and solder them. Do it one wire at the time.

    • The 5 red wires go to pads marked 5V.

    • The 8 black wires go to the pads marked GND.

    • The 3 yellow wires go to the pads marked 12V.

    • The blue wire goes to the pad marked -12V

    • The white wire goes to the pad marked -5V

    • The orange wire goes to the pad marked PG (Power Good signal)
       

  8. Now the tricky bit is to solder the 2 AC wires on to the PSU. AC-L should be blue and AC-N should be brown.

  9. Once all wires are correctly soldered,  screw the PSU on its support with the 4 screws you saved on step 1. The screw in the middle is not required.

  10. Screw back the top shield. Make sure the wires and the black ring fit back to the opening

  11. Have a look at your work. The final result should look like one of these pictures (This is a previous version of the PSU):
     

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​​FAQ:

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Can I use these new PSU in the US?
Yes you can. These PSU will work with 110Vac and 230Vac. There is no switch to change. They will work with both voltages.

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Do I need to modify the case or the shield of my Atari?

No, the new PSU fit within the space where the original PSU was.

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Do I need special tools to swap it.
Yes. You will need a screw driver, a soldering iron and soldering tin.

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Does it come with the metal support, power switch and power socket?

No, you need a donor PSU. Only the PCB with the electronic is provided.

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Is it compatible with Atari ST, Mega ST or Falcon030?

No, this PSU has been designed for Atari Mega STE and TT. They replace the original model PSM-5341

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Can I use this PSU in my Atari MegaFile?
No, you cannot.

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Can I leave the fan unplugged to reduce noise?

The fan is extracting the warm air from the case. It is designed to cool the power supply, but also the other elements.
This power supply is more efficient and generate far less heat. If you also replace the original ACSI/SCSI hard drive with a modern solution (CF or microSD), you may be able to remove the fan. This is something you will have to test yourself as it will depend on your setup (additional RAM, video card, acceleration card, etc...)

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Why did you not fit these new PSU with screw terminals?

Using screw terminals would have made the swap easier. But these screw terminals sometime fail and you end it with a live wire handing inside your Atari. This could damage your Atari or be dangerous to you. 

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Contact me if you want to know more about this project.

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Below is a selection of photos sent by customers who purchased and fitted the power supply:
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