CD32 PSU from an A1200?

[leirbag28]

Hello fellow Amiga Users. I have heard it possible to convert an A1200/A500/A600 PSU into a CD32 power supply.

 If so I need to know how, and if it actually supplies more power than the normal CD32 PSU.

Why do I want this?, well because after many years of using the normal CD32 PSU with my CD32/SX32 pro..........it finally seems to be dying. I have tried 2 other CD32 PSU's and still the same problem..........the CD32 stops booting midway, or when fully booted, while I am working it just shuts down.

 I have a few A500 PSu's  including one that provides +5v @6.5A  the others at 4.5A.thats still more than the A600 and A1200 PSU.

Someone give me a link on how to do it or a description please. Last time I did it, I fried a Hard drive and almost the SX-1 that I had. (although it probably was because I used an old PC (286) power supply :-) )

[Stedy]

It is possible to convert an A1200 PSU to the CD32, see my illustrated guide.

The A1200 PSU can supply 3 Amps @ 5V, the SX32 Pro needs 2.19 Amp and the stock CD32 PSU only supplies 2 Amps.

Good luck,

Ian

[x56h34]

If you are looking for a finished product, you could try
this out. It requires an AT power supply to work. It's also available in the A500/A600/A1200 flavor, as well.

Basically, it will be as powerful as the AT PSU that you decide to get. ;-)

EDIT: I'm not affiliated with that online store, btw. :-)

[leirbag28]

@Stedy

Thanks Stedy, I was just looking at it on there before I saw your reply...........I was cutting my CD32 PSU and noticed that the Shielding seems to be connected.

 What I am trying to do is to connect an A500 PSU to a CD32. Should I connect the Sheilding?

I am kinda scared to do this, I have destroyed quite a few CD32's




By the way, I like they way you had your Web page before with the green glowing letters and gray background................it seemed more CD32/SX32 ish.

[leirbag28]

@x56h34

Thanks for that link.interesting stuff...........does that adaptor look like this:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=3543&item=8107921895&rd=1&ssPageName=WDVW

[x56h34]

No, it connects to the P8 and P9 connectors of the AT PSU, and then on the other end you have the CD32 power connector. The rest of the power connectors are then free for use for any other stuff, like hard/cd drives, etc.

[Stedy]

What I am trying to do is to connect an A500 PSU to a CD32. Should I connect the Sheilding?

No, don't bother it will make absolutely no difference.

Incidentally, that CD32 power adapte on ebay, I made one for 1.50 UKP all in, 1.00 UKP for the Y-cable and 0.5 UKP for the 4 pin DIN plug, both easily available.

Just check you have the right voltages on the right pins before plugging into the CD32, $5 on a cheap multimeter saves a CD32!

[leirbag28]

@Stedy wrote:

Just check you have the right voltages on the right pins before plugging into the CD32, $5 on a cheap multimeter saves a CD32!

---------------------------------------------------------

 I have no idea how to check what your saying.
and how to apply it.

So what do you think if I just connect an A500 PSU?
 it should be sufficient right?

[StevenJGore]

I made myself a 60W PSU for my CD32/SX32 Pro using a 60W PSU from an A500 and the lead from an old CD32 PSU, which ended up looking like this.

I cut the power cable from the A500 PSU (the one with the A500 power connector on the end) inside the PSU itself, and joined the black power cable from the CD32 (the one with the CD32 power connector on the end) inside the PSU using medium-sized terminal blocks. I didn't use a multimeter or anything like that, I just matched the colours of the wires and used a bit of common sense! It worked perfectly, by the way! :-)

Joining the cables inside the A500 PSU gave a nice neat solution, IMHO. 8-)

Steve.

[Zetec-S]

I have a bit of experience here.

I tried using the Montek cable as above with a AT PSU and it does work, but I couldn't get any sound.

Instead I bought StevenJGore's excellent converted A500 PSU and it works perfectly. A very good conversion.

It gives me enough power to supply the CD32/SX32 with HD, an external Floppy and keyboard.

[StevenJGore]

Instead I bought StevenJGore's excellent converted A500 PSU

It was you who won my 60W CD32 PSU on eBay? It's a small world! :-)

It gives me enough power to supply the CD32/SX32 with HD, an external Floppy and keyboard.

I had exactly the same setup, and was experiencing random resets and crashes due to power problems. I decided to make a heavy-duty CD32 PSU myself, due to a lack of ready-made commercial solutions. My CD32 ran perfectly after that!

Glad you're happy with it!

Steve.

[leirbag28]

@StevenJGore

 I just made that Amiga 500 to CD32 power supply yesterday.............it supplies my CD32 with FMV fine.but my SX32 pro.........still not enough power.............I even tried an A1200 BIGFOOT! that worked somewhat with my CD32/FMV but seemed to hang the CDROM, and it did not work with my SX32.it gave it power but it seemed to freeze. WHATS GOING ON!

What i suspect is bad power distro and I saw oxidating contacts under the FPU chip. its turning white under there. I was considering giving the HD a separate power or connecting it directly to the motherboards power like I did to the fan.

This is really awfull, I need my CD32/SX32 for a presentation in 2 days.........I may have to use my A1200 wich has a slower CPU and no FPU and crashes alot.

I need to find a solution to this power probem.

[Stedy]

@leirbag28

Have you tried bypassing the power switch of the CD32, they oxidise and cause a voltage drop. I soldered some big wire across the contacts on the underside.

The other thing I did was to solder 2 wired (0VL & +5V) from the power input to the power pins of the IDE connector, this fixed all my power problems.

I could supply pictures of what to wire where tomorrow if you need them?

Ian

[leirbag28]

@Stedy

 Yes send me pictures or something.... remember I don't know too much about the way the Power on the CD32 works, so please send me a detailed pic with description on how to connect the Laptop HD directly to the CD32 power or what it was you were saying. Did you mean the actual switch on the inside? or did you mean the inside part of where you plug the CD32's power?

I really see no oxidizing on it..........I already had a Fan wired to that but I just copied someone else........I didnt know what supplied what........I am guessing that the laptop needs +5v and Ground...........it might be easier if I just cut the 2 HD cables and wired them like you said...........I noticed in your website you wired it from underneath.....isnt that giving it double the amount of +5v and Ground?  since you still have the HD cable fully connected?

[Stedy]

Hello,

I have put 2 pictures online here:

http://www.ianstedman.co.uk/Downloads/SX32-HDD-Power.jpg and here:

http://www.ianstedman.co.uk/Downloads/SX32-Power-connection.jpg

I used 'normal' (7/0.2) wire which is rated at 2.5Amp, enough for this job.

Good luck.