3 replies to this topic

[fibrewire]

Too many power supplies everywhere. I have 12+ plugs for my Atari and half are for the low voltage stuff. Can't I just run all the 9 volt gear off one 9VAC 3.4 Amp Atari brick?

Alternative solutions?

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[bob1200xl]

I wouldn't... The way Atari designed things each device is isolated from the 120vac with a transformer. When we interconnect our devices, we don't have to worry about ground loops and such, or how we connect commons. If you run more than one device on a single transformer, those isolations may be lost.

Yes, I know -- there are a thousand anecdotes about people doing what I would advise you not to do...

It's a matter of value/cost.

Bob

[fibrewire]

Each output is isolated and short-circuit protected, and each output is rated up to 1200mA - is that enough power?

http://www.stompin-g...s/sgpowerac.htm

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Edited by fibrewire, Thu Aug 2, 2012 4:23 PM.

[BillC]

fibrewire, on Thu Aug 2, 2012 4:03 PM, said:

Each output is isolated and short-circuit protected, and each output is rated up to 1200mA - is that enough power?

http://www.stompin-g...s/sgpowerac.htm

1.2A @9VAC would be marginal for a 400/800 or any of the Atari FDD, probably fine for an 850. I blew the fuse in an OEM 400 15VA 9VAC(1.67A?) Atari power supply after I upgraded  it with a Mosaic 64K board in 1982/83, I believe this upgrade board has 32 4116 ICs. This power supply also isn't recommended for use with the 810/1050/XF551 FDDs due to their power requirements for spinning the disk. Atari later stopped shipping the 15VA power supply with the 400, replacing it with the 31VA model. While the 3.4A of the 31VA supply may be more than required I would recommend a minimum of at least 2A. preferably 2.5A.