WANTED: LittlePower Adapter IIGS or a circuit diagram to get -5V from an ATX psu

Conrad

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Oct 9, 2012, 7:30:23 PM10/9/12

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Hi everyone,

The next item I need is a LittlePower IIGS. I constructed my own
adapter, but then I remembered that the PicoPSUs as well as most newer
ATX power supplies don't provide -5V, so I guess I need a
LittlePower. Alternatively, if no one has a LittlePower, does anyone
know of a circuit I can build to get -5V from a new ATX power supply,
I am totally fine with that too. Thanks everyone!

Conrad

Polymorph

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Oct 9, 2012, 7:58:15 PM10/9/12

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All you need is a regulator that outputs -5V from a -12V input. Such a circuit is outlined on Drew's website here:
http://drewbiegs.wordpress.com/2009/10/22/replacement-gs-powersupply-complete/

I've used the same circuit in a power supply replacement myself.

Hope this helps.

Cheers,
Mike

Andre Bryx

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Oct 10, 2012, 7:36:04 AM10/10/12

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Am 10.10.2012 01:30, schrieb Conrad:

> LittlePower. Alternatively, if no one has a LittlePower, does anyone
> know of a circuit I can build to get -5V from a new ATX power supply,
> I am totally fine with that too. Thanks everyone!

I´m using a DC/DC galvanic converter 5v>5V with reverse output.
eg. Aimtec AM2D-0505 400mA with 78% efficiency
Very small, simple to use, no heating...

Andre

Sean Fahey

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Oct 10, 2012, 10:55:38 AM10/10/12

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On Tuesday, October 9, 2012 6:30:24 PM UTC-5, Conrad wrote:

> The next item I need is a LittlePower IIGS. I constructed my own

James Littlejohn sells direct now that Reactive is not available. His site is undergoing revamp (http://8bitsystem.com/) but you can e-mail him at:

narguthru @ yahoo . com

Conrad

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Oct 10, 2012, 5:28:36 PM10/10/12

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Thanks guys for all your suggestions. I emailed James just after I
posted my question but I haven't heard back from him yet. If he
doesn't get back to me in a week or 2 I will persue the other
suggestions. Thanks so much guys!

Conrad

Whazzupdoc

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Oct 10, 2012, 7:11:44 PM10/10/12

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You could just replace the innards of the power supply with a nice quad output supply like this one: EOS LFMVLT80-4000

Jameco Part no. 2081721
Manufacturer EOS POWER USA INC.
Manufacturer no. LFMVLT80-4000
http://www.jameco.com/Jameco/Products/ProdDS/2081721.pdf

This person used one to fit inside a Vulcan:
http://www.cirruscomms.com.au/~mike_stephens/apple2/hardware/Vulcan_Power_Supply/index.html

Whazzupdoc

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Oct 10, 2012, 8:25:28 PM10/10/12

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Another option is purchasing a Liteon PE-5221-08 220Watt power supply and moving the guts to the Apple power supply case.

Lots of details here:
http://www.harrowalsh.de/Elektronik/APPLEBOX/powersupply_upgrading.htm

BLuRry

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Oct 10, 2012, 8:32:16 PM10/10/12

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Holy cow... that looks like it might even fit inside a //c... (time to get out the ruler.)

-B

Polymorph

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Oct 10, 2012, 10:20:09 PM10/10/12

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That person was me. :-)

Cheers,
Mike

Sean Fahey

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Oct 11, 2012, 9:55:11 AM10/11/12

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He might be out hunting, or traveling for work. I'll give him a call this evening and see if he knows you're looking for him.

The Littlepower is a very nice adapter.

Sean Fahey

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Oct 11, 2012, 9:58:00 AM10/11/12

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On Wednesday, October 10, 2012 7:32:17 PM UTC-5, BLuRry wrote:

> Holy cow... that looks like it might even fit inside a //c... (time to get out the ruler.)

I don't know if it's commmon knowledge or not, but Littlejohn also has an internal Littlepower + battery solution for the IIc Plus.

BLuRry

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Oct 11, 2012, 1:22:01 PM10/11/12

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//c+ yes -- but the //c+ had a different power design from the //c. I think it is a feasible plan to remove the modular power converter box from a //c and the round din plug in favor of a standard 3-pin plug and a more modern internal power supply. I've been wanting to execute this mod on my //c for some time, just not had the time to plan it out. I think if I spent the required amount of time on it I would have an upset spouse and disappointed children. :-D

-B