Wednesday, June 8, 2011

Power Supply - Conversion

Being without a power supply got me searching for alternate power solutions. The original 230V power supplies are quite hard to come by and fixing the existing aging ones is only going to get me so far. Even when I get around to fixing them how much longer are they really going to last? What I was after was a long term solution. I have seen several good examples of converting PC supplies or triple voltage supplies but these require a modification to make them output the -5V voltage. That is not a huge issue but it is more work than I had hoped for. Quad voltage power supplies are also available but they are wider than the IIGS power supply (which is long and thin) making them difficult to fit inside the IIGS. That was until now. While searching around I came across the SDS60. It's a quad voltage power supply but has a form factor that will allow it to fit inside a IIGS power supply case.

When I ordered the SDS60 I was informed that full production of these was not yet under way so I had to wait a few months for the next run. It was a long wait but well worth it. Once I had the unit it took less than an hour to do the conversion and have my IIGS up and running again. It was the easiest soldering job I have done in years. What more could I ask for? Quad voltage power supply that is small enough to fit into a IIGS power supply case, a breeze to install and uses off the shelf parts. Perfect. It even has a wide input voltage range so you could easily transport it between countries.

Other power supply conversions :-
http://drewbiegs.wordpress.com/category/iigs-power-supply/
http://www.8bitsystem.com/slorble/?page_id=5
http://damntechnology.blogspot.com/2010/07/apple-iic-plus-240v-modification.html

Parts:
Made by XP Power http://www.xppower.com/orderPriceList2.php?seriesid=100114&groupid=100025&catuid=1&lang=EN
1. SDS60UQ02 Quad Voltage Power Supply
2. SDS60Q CONKIT Quad Voltage Power Supply Connection Kit

Australian distributors :-
1. http://www.amtex.com.au/power_pdf/SDS60.pdf (about AUD$150 delivered)
2. http://au.element14.com/jsp/search/productdetail.jsp?sku=1109927&CMP=LEC-XPPowerSC&ATT=1109927

Procedure:
In my junk box I had a 120V IIGS power supply which I was going to convert into a 230V supply one day. This will work very well as a base. I desoldered the PCB then just added the cable connectors. It was then only a matter of adding the standoffs and plugging in the SDS60.



Next step is to do some load tests and swap the standoffs from adhesive to screw type. This should lower the PCB and move the heat sink from sitting right up against the cable plug.


Update: 1st November 2012.

I was able to convert another Apple IIGS power supply very cheaply thanks to Mike who found a great source of these handy replacement modules.
It only cost me AUS$45 for two modules including postage to Australia.

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

Mike's power supply conversion :-
http://www.cirruscomms.com.au/~mike_stephens/apple2/hardware/Vulcan_Power_Supply/index.html

Jason's power supply conversion :-
http://www.appleiioz.com/appleiioz/Apple_IIoz/Projects/Entries/2015/4/14_IIgs_110v_to_240v.html

Other interesting power supply write ups :-
http://forums.overclockers.com.au/showthread.php?p=14154884#post14154884
http://www.harrowalsh.de/Elektronik/APPLEBOX/powersupply_upgrading.htm

The procedure was pretty much the same as my other power supply conversion.




2 comments:

Ljayvee6 said...

What is the voltage output of an apple ii power supply?

Lukazi said...

You can find the power details from the following web address including many other Apple II port specifications:- http://apple2.info/wiki/index.php?title=Pinouts