Homebrew PCBs

On Tue, 15 Sep 2009 09:43:38 +0530, you wrote:

> Hi
>
>I use Tina for all my simulations and work. It also allows me to create my
>PCB's
>
>Being small time I would use toner transfer method for my work..
> This is where my confusion starts.
>
>To better explain my problem I have uploaded two files at the location
>http://tech.groups.yahoo.com/group/Homebrew_PCBs/files/First_PCB/
>
>The first file is InvAmp.Gif, this is the image of the PCB I see when it is
>auto generated.
>
>The next file is InvAmp.pdf which is the print I will get and is a mirror
>image.
>
The reversed image will transfer correctly to a board.  All toner
transfer layers when printed must be mirror images.  You should not be
able to read the print directly.

Look at the diagram through the paper when held up to light.  The
toner side should be facing the light.  That toner will be transferred
to the board as you see it through the paper.  At this point, you
should be able to read the letters.



>I think I am not suppose to use the mirror image for the work when I am
>using toner transfer or am I thinking wrong ??

You do use the mirror image.  Try the experiment with a piece of
paper.  Try to transfer the image from the paper (cheap paper, scrap
of board) to the board.  You should see the image properly.

In some programs, you may or may not automatically print the bottom
layer reversed, you do, this is good.  It saves a step.

Harvey

>
>This may be very silly but I am just not sure.
>
>My actual circut is quite different but I just used this simple inverting
>amp of an opamp to demonstrate my query.
>
>Thanks
>Regards
>-- 
>Gaurav Verma
>Email - Gaurav.Verma.MCA@...
>Phone - 9910732960