Power Supply for Atari ST family - 2024 version
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 STF, STFm, STE and Mega ST
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.
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 ST, STF, STE and Mega ST. 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:
Once you removed your old PSU from your Atari ST, follow these instructions:
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Unscrew all 4 screws holding the PSU on the support. Keep these screws and the plastic film.
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With your soldering iron, unsolder the 2 AC cable. You apply heat on the solder pads and pull the wires from the other side
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Do the same with the motherboard connector. Heat the pads and pull the wires. Do it one by one.
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If you have a pump, heat the wire end of each wires and such the solder tin that may remain.
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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.
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The 2 red wires go to pads marked 5V.
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The 3 black wires go to the pads marked GND.
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The bleu wire goes to the pad marked 12V.
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Now the tricky bit is to solder the 2 AC wires on to the PSU. There is no order. You can solder them in any AC pads. Just see where they fit best. One is longer than the other.
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Once all wires are correctly soldered, put the plastic film and screw the PSU on its support with the 4 screws you saved on step 1
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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 adapt.
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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 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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Do 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 TT, Mega STE or Falcon030?
For TT and Mega STE, the new PSU could provide the power, but the physical design will prevent you to fit it on the support.
For Atari Falcon030, the PSU should fit, but the main AC wires and motherboard wires may require extra modification. This has not been tested yet.
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Can I use this PSU in my Atari MegaFile?
No, you cannot. This PSU will physically fit in an Atari MegaFile, but is not designed to power the large 5-1/4 hard drive.
If you try, you will notice the disk will struggle to start because the 12V output does not have enough power.
If you need a PSU for your MegaFile, look here: PSU for Atari MegaFile 30 or 60
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What is the USB socket used for (when fitted)?
This USB socket can be se to power small devices such as an ACSI2STM or UltraSatan drive. You could power a HDMI video convertor you added to your video signal. You can power an Arduino you used to build a project such as cool LED effect on the keyboard. Anything that require 5V via a USB A cable with up to 1A current.
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Can I power a floppy drive directly from the PSU?
Yes, there are extra pad to solder extra wires. You could salvage a FDD cable/connector from an old PC PSU to use in your Atari.
the BLACK edition has more pads available to power more things.
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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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Some PSU made before October 2024 had LEDs. Why these new PSU d not have them?
Yes, previous version of these PSU had LEDs showing when the 5V and 12V were present. The lights were visible through the case of the Atari ST when it was on and that was something many did not like.
Also, by no including the LEDs, cost were reduced a bit and prices have been lowered a bit.
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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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