12v Xenarc Power Supply

StuBoy · 01-31-2003, 05:43 AM

I have a Xenarc 7" VGA Screen and am wondering about the best way to supply the power.
I've done a search and have read that others supply from the PC's PSU.
However my question centres around the amps.
The Xenarc requires between 11 and 14 volts which is not a problem from the PSU, however it only requires 1 amp but the PSU supplies 3-4 amps.
Is this increased ampage going to 'fry' my display or should it be OK?
Looking at installing it this weekend so any help or pointers would be appreciated.

StuBoy

thenominous · 01-31-2003, 09:05 AM

No, the voltage is what matters, the screen will only draw as much current as is required. It would be good practise however to put a fuse on the positive power line to the screen for say 1.5A just as a precaution.

PC PSU's dont have any over voltage protection (prove me wrong, please!) as I found out when my PC PSU blew.
If you wanted to add over voltage, you would need to look at building some circuits to do it.

Dave

§w|tch · 01-31-2003, 10:15 AM

The Xenarc monitors are exremely tolerant. They take an input voltage of 11v up to 30v I believe... 30 or 36, I can't remember, but it was in the 30's. Xenarc lists the power being 11-14v, but thats just the power that their 120v power supply puts out. The monitor itself has a much higher acceptable voltage range.

As for the current draw, a 1.5a fuse is definitely a good idea. They're only supposed to draw 1a, so anything more than that you've probably got an issue.

digitalww · 01-31-2003, 02:48 PM

I think 14V DC is the most it can handle... 10 ~ 36V is stamped on the housing

but that will fry it.
Here is the label that says 12V

With these monitors it is better to be safe then sorry.

Armen

duffydawg · 01-31-2003, 06:12 PM

Armen is correct about this. I have spoken with them and they have told me that it is a max of 14vdc. The manual actually states that as well, be careful with it, definitely better safe than sorry.

cproaudio · 02-01-2003, 02:44 AM

Quote:

Originally posted by thenominous (Dave)
It would be good practise however to put a fuse on the positive power line to the screen for say 1.5A just as a precaution.

1.5A at 12V = 18 watts. Xenarc requires only 8-12 watts for power. Xenarc will fry before the fuse will. You should put 1 amp fuse for the Xenarc b/c fuses will tolerate up to 3 times its rated current before it blows. This is why you can get away with 60A fuses on a 1200watt max amp b/c the amp is not 1200watts continuous.

Quote:

Originally posted by §w|tch
The Xenarc monitors are exremely tolerant. They take an input voltage of 11v up to 30v I believe... 30 or 36, I can't remember, but it was in the 30's. Xenarc lists the power being 11-14v, but thats just the power that their 120v power supply puts out. The monitor itself has a much higher acceptable voltage range.

As for the current draw, a 1.5a fuse is definitely a good idea. They're only supposed to draw 1a, so anything more than that you've probably got an issue.

I can tell by that statement that you haven't hard wire the Xenarc in an actual car install with out using te AC adpater. Xenarc will tolerate up to 15 volts. Anything over 15 volts for a few minutes will fry the monitor. I've done it. http://www.mp3car.com/vbulletin/show...ghlight=xenarc If you still don't believe me, here's something you can try. Power the Xenarc monitor with a fully charged 18 volt DeWalt or Makita battery and measure the voltage on the battery. It should read 20+ volts for a healthy battery. I can almost gurantee you that as soon as you turn on the monitor you'll hear a little pop and a puff of smoke will come out of the edge of the power LED light. If you're lucky you'll see a little spark too. Don't worry, it only cost $60 bucks to replace the internal power supply by Xenarc.

vxr666 · 02-01-2003, 06:13 AM

you can build a voltage regulator circuit to supply 12V 1A.

thenominous · 02-01-2003, 08:40 AM

When the car is running giving out around 14V yes you can, but turn the eingien off, and the battery is giving out 12V itself. The bog standard voltage reg's will then stop working.

Dave