Fitting an iTuner PW-200-M ATX PSU inside A1200

[delshay]

well done.

but this project does have drawbacks.

1. if the powersupply goes faulty its a lot of work to change it.

2. it blocks access for a BlizzPPC SCSI or any other device that use that slot.

3. it has lots of cable going across the motherboard.

excellent project.

[delshay]

looking at the photo you do not need keyrah,you can still attach the standard A1200 keyboard.

one thing does concern me is heat under the floppy drive. pico PSU are silent PSU'S but here under testing i found the pico 120w needs cooling under *extreme loads* otherwise voltage will stray.

but this is a 200w PSU so under extreme loads keep a eye on temperture as this is under the floppy drive.

it's still a excellent project.

[delshay]

In my sterstest I found ou that it did not heat up much don´t remember exact readings but it was below 50 celsius. The PSU it self is quite efficient so most of the heat comes from the power brick attached to it.

im talking under **extreme** loads.

here is my deaktop config:

PICO 120W
A1200 desktop PPC 268Mhz with Bvision,128Mb ram,
indivision ( runs on seperate 3.3v from PSU )
elbox eide mkIII.

this is my cofig at the moment and the PICO 120W PSU is very hot on one side,i cant keep my finger there,so it must be around 50 to 60c.

this is with floppy drive,sound card and extra 128Mb of ram not attached.

all im saying is as you put more and more load on the PSU watch the temperture because it mounted under the floppy drive... in other words you don't want to be heating up the floppy disc if one is inserted.

[delshay]

Well PICO 120W shouldn't even be able to handle MAX currents that your system draws from 5VDC.

well the PICO 120W outputs 7a max on the 5v rail same as pico 200.

on my old project a pico 120w powered the same config but had 256Mb of ram,floppy drive added but a fan was needed to keep the pico cool. this project had no problem whatsoever. if i remember the PICO's do have **overload protection**  correct me if im wrong

PICO PSU will normaly fit in a case where a fan may be present ( fan depending on computer system  ) the case fan will keep all componets cool including the PICO PSU.
i do remember reading somewhere that when the PICO reachs near it peak output its best to fit a fan.

a fan is not always needed it down to the load on the PSU,on the amiga pay attension to the 5v rail. in a standard A1200 with a expansion card this may be fine,but as you put more load on ie gfx card,sound card whatever you are going to need a fan,as when the PICO gets to hot it may give-out spikes on the  5v rail which locks-up the whole system, this is why i added a fan on my old project to fix the problem.

[delshay]

i also like to add that if you are going to add a PICO PSU it may be a good idea to go for a wide voltage input as this make the A1200 more flexable,ie you can move A1200 to another location without bringing a 12v PSU,just use a laptop PSU or a heavy duty battery.

and don't forget to add a internal switch for NTSC or PAL.

now you amiga can work almost anywhere,all you need now is a LCD screen.( portable amiga )