Opus 90w problem

**sxpert** · 07-20-2004, 06:34 AM

Just bought an opus 90w power supply and have an issue

here's a description of the test setup :
I use a regular 9 EUR PC power supply designed for a P4 system to power the opus (via the 4 pin connector) with 12v (the supply is rated for 13 amps of 12v)

the computer is currently composed of an EPIA M 10000 and a seagate laptop HDD (ST94811A 40G http://seagate.com/cda/products/disc...81,594,00.html )

when I turn the power on, the opus starts, but shuts down about 35 seconds later.
this does not occur when the HDD is powered from the regular supply while the EPIA is powered by the opus.

Any clues ?

**dominic** · 07-20-2004, 06:43 AM

i tried running my opus 90w off an old crappy psu, as you are, and it shut down after about 30 seconds, but it works fine im my car.
i never tried connecting the hdd to the mains psu......

i just put it down to the crap psu i was using, and assumed the 12v rail couldnt supply enough power, then when the backup caps on the opus ran out, the opus shut down....

**fly_dutchie** · 07-20-2004, 07:06 AM

Originally Posted by sxpert

Just bought an opus 90w power supply and have an issue

here's a description of the test setup :
I use a regular 9 EUR PC power supply designed for a P4 system to power the opus (via the 4 pin connector) with 12v (the supply is rated for 13 amps of 12v)

the computer is currently composed of an EPIA M 10000 and a seagate laptop HDD (ST94811A 40G http://seagate.com/cda/products/disc...81,594,00.html )

when I turn the power on, the opus starts, but shuts down about 35 seconds later.
this does not occur when the HDD is powered from the regular supply while the EPIA is powered by the opus.

Any clues ?

The Opus is not ment to be connected to a PSU. It needs continious 12v AND continious switched 12V to keep it on. If you turn the switched 12v off, the Opus will power down within the set time-out period. So momentary switching won't work, because it wouldn't know when to power down.

What 4 pins anyway, you mean 3 pins right?

Michael

**Laidback** · 07-20-2004, 07:16 AM

Originally Posted by fly_dutchie

The Opus is not ment to be connected to a PSU. It needs continious 12v AND continious switched 12V to keep it on. If you turn the switched 12v off, the Opus will power down within the set time-out period. So momentary switching won't work, because it wouldn't know when to power down.

What 4 pins anyway, you mean 3 pins right?

Michael

I think he means he used the 4 pin P4 connector on the ATX PSU to supply the 12v, you can just connect 12v to the constant and the switched connections and it *should* work but I still think it's power related.

**sxpert** · 07-20-2004, 07:17 AM

Originally Posted by fly_dutchie

The Opus is not ment to be connected to a PSU. It needs continious 12v AND continious switched 12V to keep it on. If you turn the switched 12v off,

yes, I understood that, and connected both the opus RED and BLUE wires to the 12v rail

What 4 pins anyway, you mean 3 pins right?

The regular PC power supply had (replaced with a 3 pin XLR) a 4 pins connector that is normally used to supply extra 12v for P4 based machines

any ideas on how to generate 12v for at-home testing (without ruining myself with a n electronics lab power supply) ?

**fly_dutchie** · 07-20-2004, 09:56 AM

Originally Posted by sxpert

yes, I understood that, and connected both the opus RED and BLUE wires to the 12v rail

The regular PC power supply had (replaced with a 3 pin XLR) a 4 pins connector that is normally used to supply extra 12v for P4 based machines

any ideas on how to generate 12v for at-home testing (without ruining myself with a n electronics lab power supply) ?

Don't test the Opus at home.

I just hooked up a crappy PSU's 20 pin to the board and connected the drives power cables. In this setup you can test acpi functions (hibernate, etc).
Then set pin switches on the Opus for a 20 minute shut down delay (tank circuit) and the powerdown option to hibernate/powerdown. (uses just a trickle of power)
The Opus should work out of the box, if it doesn't, at least you know you got the pc set-up right.

Michael

edit: I think there needs to be 12 volt present, before you apply the switched 12v, which needs to stay connected. You could try to put a switch on the switched 12v.