Unit question

Holger Barske · 11th July 2003, 09:13 PM

A pcb with a 4 oz. copper layer - how much ist this in micrometers?
Sorry, we europeans sometimes have some trouble with those american units...

kelticwizard · 11th July 2003, 09:20 PM

I don't do pcb's, but I believe that there are 28 grams per ounce weight-wise.

There are 33 ounces per liter, volume-wise.

I'll leave it to you to decide which one the poster was referring to.

This converter might help in the future. When using it, remember to write "floz" when you mean fluid ounces instead of weight ounces.
http://www.convertit.com/Go/ConvertI.../Converter.ASP

Ron E · 11th July 2003, 09:58 PM

4oz copper is 150 micron, or so I am led to believe by a website.

It probably means 4oz per square yard square foot or something like that

0.0150cm*91.44cm*91.44cm=125.4cc
Cu=8 grams/cc
125*8~1000grams per square yard

111 grams per square foot or about 4 ounces per square foot...

Aren't english units simple

pinkmouse · 11th July 2003, 10:09 PM

Quote:

Originally posted by Ron E
111 grams per square foot or about 4 ounces per square foot...

Surely you mean 111g per 0.0924m2

Holger Barske · 11th July 2003, 10:48 PM

150µ sounds good, it is a board with serious current transportation.
Thx a lot guys.

subwo1 · 21st July 2003, 07:23 PM

It keeps telling me to do a search before I can post a new thread even after I did a search.

pinkmouse · 21st July 2003, 11:16 PM

Quote:

Originally posted by subwo1
It keeps telling me to do a search before I can post a new thread even after I did a search.

But did you tick the box at the top left hand corner of the new thread page?

subwo1 · 21st July 2003, 11:42 PM

Sorry, I didn't mean to get off topic below. 4 oz sounds pretty decent current-wise as I have often seen 1 oz advertised. It would be good to make your echant has some potency left.

I appreciate your response, Pinkmouse. With Jason's aid, I finally saw and did exactly what you mentioned.

I guess the title of my posted thread could have been more interesting to attract more attention. I am anxious to get some feedback on the amp design I thought up.

Class AB

11th July 2003, 09:13 PM	#1
Holger Barske diyAudio Member Join Date: Jan 2001 Location: Ruhrgebiet	Unit question A pcb with a 4 oz. copper layer - how much ist this in micrometers? Sorry, we europeans sometimes have some trouble with those american units... __________________ Best regards: Holger www.holgerbarske.com

11th July 2003, 09:20 PM	#2
kelticwizard diyAudio Member Join Date: Sep 2001 Location: Connecticut, The Nutmeg State	I don't do pcb's, but I believe that there are 28 grams per ounce weight-wise. There are 33 ounces per liter, volume-wise. I'll leave it to you to decide which one the poster was referring to. This converter might help in the future. When using it, remember to write "floz" when you mean fluid ounces instead of weight ounces. http://www.convertit.com/Go/ConvertI.../Converter.ASP __________________ "A friend will help you move. A really good friend will help you move a body." -Anonymous

11th July 2003, 09:58 PM	#3
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	4oz copper is 150 micron, or so I am led to believe by a website. It probably means 4oz per square yard square foot or something like that 0.0150cm91.44cm91.44cm=125.4cc Cu=8 grams/cc 1258~1000grams per square yard 111 grams per square foot or about 4 ounces per square foot... Aren't english units simple __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan* Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan

11th July 2003, 10:48 PM	#5
Holger Barske diyAudio Member Join Date: Jan 2001 Location: Ruhrgebiet	150µ sounds good, it is a board with serious current transportation. Thx a lot guys. __________________ Best regards: Holger www.holgerbarske.com

21st July 2003, 07:23 PM	#6
subwo1 diyAudio Member Join Date: Jan 2002 Location: North American Continent	Help It keeps telling me to do a search before I can post a new thread even after I did a search.


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21st July 2003, 11:42 PM	#8
subwo1 diyAudio Member Join Date: Jan 2002 Location: North American Continent	Thanks Sorry, I didn't mean to get off topic below. 4 oz sounds pretty decent current-wise as I have often seen 1 oz advertised. It would be good to make your echant has some potency left. I appreciate your response, Pinkmouse. With Jason's aid, I finally saw and did exactly what you mentioned. I guess the title of my posted thread could have been more interesting to attract more attention. I am anxious to get some feedback on the amp design I thought up. Class AB __________________ USMPS http://groups.yahoo.com/group/switchmode/

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