exxos's Atari, Amiga & retro forum

A new designed ST/STE PSU.

Offers the following features.

1) Safe low voltage design.
2) Best possible output ripple regulation.
3) Best possible surge current regulation.
4) Fast efficient switchmode regulators.
5) Fix onto old PSU framework.
6) 110V or 230V options.

These PSUs offer 10 times better regulation and efficiency over the original Atari PSUs. They use a safe low-voltage toroidal transformer, so no high-voltage parts (400volts ) which are prone to failure are used.

The Falcon PSU also includes the PSU connector as shown below.

PSU homepage
http://www.exxosforum.co.uk/atari/last/psu/index.htm

ST PSU store link
https://www.exxosforum.co.uk/atari/store2/#0029

Falcon PSU store link
https://www.exxosforum.co.uk/atari/store2/#0094

Please note, these power supplies take a great deal of time to build and test, so it is difficult to keep stocks of them all the time in my store. Please keep their eye on news and announcements section for upcoming news on new batches of these power supplies.

Every now and then I get an email as the buyer thinks I have sent them the wrong voltage power supply. This is unlikely. The problem is people read the label on the toroidal transformer and misunderstand it. The transformers I use are dual voltage primary transformers. This means they can be wired for 230V or 110V operation.

230V wiring.
So for 230 V operation the two primaries of 115 V wide in series to give 230 V.

110V wiring.
Two primaries of 115 V winding parallel the result is still 115 V.

I should also add here that the input voltages are only approximate at 230 V. The actual input voltage range can be, 220 V, 230 V, 240 V. Here in the UK, the mains voltage is normally more like 250V anyway. This does not cause any issues with the transformer. Mains voltages are rarely what they are supposed to be and vary on actual voltage during various times of the day and night.

For 115V, the actual input voltage can be 110 V, 115 V, 120 V.

Please see my website for more information on how to wire the power supplies and install them.
http://www.exxosforum.co.uk/atari/last/p ... m#EXXOSPSU

Does the ST PSU work in a Mega ST (the pizza box ones, not the Mega STE) as well or does it have different requirements?

keli wrote: 14 Sep 2017 13:52 Does the ST PSU work in a Mega ST (the pizza box ones, not the Mega STE) as well or does it have different requirements?

It will work in the mega ST also :)

There's no one watching news about new Falcons PSUs closer than I am. ;-)

I'll be taking two for the Falcon and one ST one.

Btw, if you don't me asking, is there a fundamental difference between ST/STE/MegaST and MegaSTE/TT PSUs so that you don't label your PSUs compatible with them?

mikro wrote: 15 Sep 2017 07:14
Btw, if you don't me asking, is there a fundamental difference between ST/STE/MegaST and MegaSTE/TT PSUs so that you don't label your PSUs compatible with them?

The mega STE and TT, are totally different power supplies. They have negative voltages which the ST power supplies or Falcon power supplies do not have. They also have 7 or 8Amps output over the 2 or 3 A of the ST power supplies.

I did consider doing a mega STE power supply, but I found it practically impossible due to the space constraints within the power supply case itself. There is just no physical room to mount a toroidal transformer as well as the electronics.those power supplies seem pretty robust and if looked after there should be no real reason why not to continue to use them.