Hi.
I haven't towerize my Amiga 1200 and i'm only using a A500 PSU to feed the motherboard. (plugged in the power connector of course) My hard disks and CD drive are hosted into a simple pc tower and powered from the PSU of this tower.
The A500 PSU seems powerful enough, as both the 68k and the PPC side (WOS, PUP) in AOS3 are rock stable, but i'm having some stability issues with MorphOS. I'm not sure of what causes this issues in MOS but i want to try to plug a power cable from the PC PSU of that tower, to the disk-drive plug of the mobo and see if this improves things.

So... i will have a A500 PSU plugged in the power plug of my Amiga and a PC PSU plugged in the disk-drive.
Hmm, Is this safe? If it is, in which order should i switch on and off the PSUs?
I need some responsible feedback on this because i don't want to burn my rare and precious hardware.

I'm definitely no expert on this, but I have a vague feeling it is not
a good idea. Powering the drives etc from another PSU should be fine,
but I suspect there might be weird and unexpected side effects if you
plug in two of them in the same circuits.

That is not really a safe idea. Don't risk your Amiga on something like this.

You should be able to test it well enough with AOS3. Put the ppc under as much cpu load as possible and see if everything is still stable. (DNETC is a good place to start if you aren't running it already.)

There are several things it could be.. (Power supply, heat related..) Or maybe something is up with MorphOS.

I wouldn't do that. If voltages of these two power supplies are
different (and for sure they are - at least a little), there will flow
quite big currents by your main board wires.

By the way, why don't you get rid of A500 PSU and simply connect pc
PSU to A1200 power connector?

Thank you for the warnings guys. I won't dare it.


@Madgun68
Quote:
I haven't found a WOS/PUP version of DNET but i do have tested my system with high PPC CPU load under AOS3 and it's stable.

Have a look here for DNet.

http://distributed.amiga.org/

i have made already two pc psus working with amiga... it's simple, you just need a multimeter, solder and some small intelligence Measure all of the pins that supplies your amiga of the amiga psu, you should get some gnd, +12, -12, +5 and -5 Volts (i hope so... just don't remember exactly), then cut the Amiga cable near to the psu, release all those wires, and mark, which one brings to amiga what...
then open the pc psu, and find where are all those needed poweroutputs, and solder there your wires from the amiga cable... that's all... now you have a strong pc psu with amiga cable, and that should be enough... for every amiga configuration

bye, MarK.

ps: i could do it for you, if you would send it to me

[ Edited by MarK on 2007/4/13 6:26 ]

@Wishmaster
Quote:
Ok, got it.


@Mark
Quote:
Thanks, but your instructions made it easy enough

[ Edited by AmigaMancer on 2007/4/13 18:31 ]

Hi !
Use 2 PSU is very dangerous !
If the Amiga PSU do not start, you send power to "data" pins of components without power them.

For a unique PSU, let's have a look here :
http://amigaga.chez-alice.fr/classic/bidouilles/alimentation/alimpcatamiga.htm

[ Edited by Get27 on 2007/7/15 12:14 ]

I literally burned one A1200, the 1200 PSU and a AT psu doing that a lot time ago.
Do not make it!
Its really dangerous!

Wow! 3 devices in a row.. Thanks for the warning.