1. ## Power my Opus?

Can an old at power supply from an even older computer be used to power my Opus on my test bench? I have one laying around and it has female spade connectors on all of the ends. I have plenty of male spades that I can crimp onto the ends of the Opus. Would this work if I get the 12v and ground? Any problems anyone can come up with?

2. I have a question: why? Just test it in a car, and power your pc by the old ATX power supply when it's on your bench.

I don't see why it wouldn't work except that I'm not sure how much amperage an ATX power supply expects to see on their 12v hard drive connectors...plus, how you gonna turn it on without it being interfaced with the motherboard, unless it is a REALLY non-ATX supply...

3. Ok, maybe another angle here then. Can I use a transformer plugged into the wall to get my 12v? I have a few 12v ones laying around that I could cut the ends off of and then check for polarity. Attach the 12v and ACC wire from my Opus to them and then the gound to the other side. I know this would work just wondering how many amps I can expect the Opus to draw. I have a Syntax s635mp mobo, 512 mb ddr, pioneer slot load dvd rom, and a 40gb 7200 rpm hd.

4. Um, yea, have a fire estingusher ready if you try that one.
P=IV (Power = Current * Voltage) or P/V = I. At 150W/12V you get 12.5 Amps. I doubt the tiny 24 gauge wire comming out of your transformer can handle even the 5 amps your system may draw.

Unless you have a 12V transformer rated at several amps, I wouldn't try it. The Current rating is stamped on the transformer. Take a look and see what it says likely something in the 100mA (.1 Amp) range.

5. 150W Maximum Rated Output @ 90% Efficiency ~= 167W Input
167W / 12VDC ~= 14A Maximum Input Current.

Of course the OPUS is reported to run beyond it's maximum rated 150W capacity and therefore the input current could go even higher (~20A at 50% over spec). Regardless, your typical household AC to DC supply probably cannot supply enough current to run the OPUS at it's upper limits, if at all.

If you're trying to test your system, it's easier to do with a standard ATX supply. If you're trying to test your opus, that's easiest to do with an actual 12V battery and/or attached car.

6. Ok, so my highest rated one is 1.4 amps. Not even close. There has to be a way that I can power this Opus other than getting a car battery and bringing it into my house or waiting until I install it in my Tahoe. How can I power on this old power supply that I have and use the 12v it puts out to run the Opus? I do have an old AT switch that I can hook up to it to turn it on. Would that work?

7. It's 'possible' your old AT supply could be used to power the Opus. You'd have to check what it can do on the 12v rail. Even so, I wouldn't try it. Do you really want to risk frying your \$200 Opus?

Consider investing \$20 on a cheap ATX supply for in-the-house testing.

8. Still would have no way to turn it all on without a power switch.

9. Old AT power supply may not be able to handle it. I have one laying around and it is not capable. Newer ATX, however, will run it. The problem is starting it, though.

10. Have slept on the idea overnight and have decided to just use a standard atx power supply and make a switch that I can just hook to the motherboard to turn it off and on for now. My question now is: The power switch should be a momentary switch and not a latched one, correct?

Page 1 of 2 12 Last

#### Posting Permissions

• You may not post new threads
• You may not post replies
• You may not post attachments
• You may not edit your posts
•