Calculating Required Voltage

UncoCow · 09-24-2002, 01:30 AM

OK I'm no electronics expert all i've done is year 12 physics so know the basics...

Anyway i want to install a mp3 box into my car and it's cheaper for me to get an AMD 1800 than to try and find a second hand piece of ****!

OK so i got everything worked out except the power supply... Now i go to AMD site and get the voltage and current of 1800 (1533Mhz) and it is 1.5V 34A. So if i'm correct that's 51W? Then it talks about max current 5.87A and typical 3.7A...

Then i got a motherboard with built in lan, audio, geforce 2 (nforce chip)... DVD Drive and HDD (80gig probably)...

Now how am i meant to tell how much the peripherals use up and the motherboard itself? and obviously ram as well....

Would a 250W Keypower be enough to power all this.... because i'd be prepared to pay the money for it...

Also i'm not totally clear on starting the car etc - like does the Keypower keep the computer on? When i turn the ignition on can i make the computer come on? When i turn the ignition off can i make the computer go into shutdown sequence? i spose i'd have to put the power switch connected to the ignition lead or something?

Thanks for reading this!

PS: i did use the search feature and read through all posts and still couldn't get this stuff clear so if i'm asking obvious stuff it's cause im stupid

Aaron Cake · 09-26-2002, 08:16 AM

250W will be enough for that system.

The 2nd set of questions have alreay been answered many times. So a search for "shutdown controller" and you will find your answers.

UncoCow · 09-26-2002, 08:19 AM

cheers mate

ok sorry i'll have a read thru again about the shutdown controllers

InvisiBill · 09-27-2002, 02:12 PM

Check out the threads on the Opus too. It's a DC-DC PSU with shutdown controller built-in. The most PnP solution I think I've seen so far...