Film-Tech Forum ARCHIVE: Make this please

This is topic Make this please in forum Film-Yak at Film-Tech Forum ARCHIVE.

To visit this topic, use this URL:
https://ft-forum.com/ft/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=8;t=004582

Posted by Ron Curran (Member # 3631) on 04-01-2006, 12:08 AM:

As kids, we all wanted flying cars. There are other things I would like now. Such as …
We all have racks full of equipment, each with its own power supply. The power supply is the most expensive component in any of these. It takes up space, it’s heavy and sometimes troublesome. And it sits next to sensitive stuff, producing lots of heat.
Why not make...

[ 04-03-2006, 02:14 AM: Message edited by: Brad Miller ]

Posted by Adam Martin (Member # 641) on 04-01-2006, 12:48 AM:

That would be great if the world ran on DC power like Thomas Edison wanted. Unfortunately, Westinghouse won out with his silly alternating current.

Posted by Ron Curran (Member # 3631) on 04-01-2006, 02:21 AM:

Did I forget to say 12V DC in this best of all possible worlds?

Posted by Brad Miller (Member # 2) on 04-01-2006, 03:33 AM:

Why not make the title of this thread something that follows the forum rules so I don't delete it?

Posted by Scott Norwood (Member # 30) on 04-01-2006, 07:36 AM:

So if the "master power supply" failed, you wouldn't just lose (say) your exciter supply, but also all of your other sound equipment, too. Lovely.

Posted by Joel N. Weber II (Member # 3530) on 04-02-2006, 12:47 PM:

In the telephone company world, much equipment runs off 48VDC batteries that are then connected to the AC power, which is sort of like what you're suggesting. However, digital electronics generally need to have DC-DC converters to make good use of this power, because they use a lower voltage internally, and while you can get 48VDC power supplies for computers, they're pretty rare and probably expensive (I'm not sure I've ever seen a computer power supply that uses 48VDC as its input, even though I've been in a colo facility a few times that's delighted to provide 48VDC to customers when the customers can deal with it).

20 years ago, computer power supplies produced +5V and +12V and -12V, and all the circuitry ran directly off of that; the microprocessor used the +5V output of the power supply. At least on Athlon 64 systems, we now have the power supply producing +12V for the processor that gets fed to the motherboard; the total wattage consumed by the processor is high enough that I guess that much voltage is desireable to keep the amperage down; also, there's enough variation from one year to the next in the CPU voltage that it's probably convenient to not need to constantly redesign the power supplies to deal with that. (The processor I recently bought has a maximum theoretical power of 67 watts, I think.)

Scott: how is that different from feeding an entire theater off a single transformer that produces the 120VAC, which I believe the power company normally does?

Posted by Brad Miller (Member # 2) on 04-02-2006, 05:53 PM:

Post Deletion COMING SOON!!!

"A must see"

"It was there, and then it wasn't"

"I can't wait until the sequel comes where the author tries to re-post it under another bullshit title and gets deleted from the system!"

Posted by Wayne Keyser (Member # 2420) on 04-02-2006, 06:16 PM:

Well, we'd all save money (and tech-waste) if we could eliminate the need for "power cubes" included with every single consumer electronic item, and thrown away in vast numbers.

How about standardizing the power-in requirements of most devices (if the device simply MUST have a different voltage, convert it inside) - and wire homes and offices for that power as well as 120v.

If that seems silly, remember that they've willingly started to wire homes and offices with everything from video cables to fiber-optics, even though retrofitting is a pain. For those areas where you can't rewire (actually ADD wiring), make power-strips in which one transformer would serve multiple devices.

Posted by John Hegel (Member # 628) on 04-02-2006, 08:17 PM:

The major drawback is the distribution systems. Putting any type of load on 12vdc will require some substantial wire and control systems.

The same situation applies in many commercial buildings. The power coming in will be 480/277v and stepped down to 208/120v where needed with transformers through out the building.

Posted by Mike Blakesley (Member # 26) on 04-02-2006, 09:29 PM:

quote:
Post Deletion COMING SOON!!!

I am convinced this board is populated by a lot of people who put up a topic and then don't go back and read it for weeks, if ever.

Posted by Joe Redifer (Member # 3) on 04-03-2006, 12:25 AM:

A damn pity, too. Because I made what the original poster wanted, and he'll never know. He said "please", so I felt duty-bound to make it.

Posted by Brad Miller (Member # 2) on 04-03-2006, 02:15 AM:

Awwwwwwwwwwwwwwwwww, his initial post now properly reflects the subject title of this thread.

THREAD CLOSED