Homebrew PCBs

Hi All

Please help. I purchased a piece of pre treated photo resistant pcb.
I removed the black protective layer and exposed my positive onto the board
by placing it in direct sunlight.
After 1 hr, I removed the positive and had a perfect image of my pcb design
on the pcb.
This is when it starts to go wrong.
I then placed the board in pre-made / purchased etching solution / ferro
chloride.
After much time, nothing has been etched.
What am I doing wrong?
Have I missed out something?



Stuart

stuart.lamble@... wrote:
> 
> Hi All
> 
> Please help. I purchased a piece of pre treated photo resistant pcb.
> I removed the black protective layer and exposed my positive onto the board
> by placing it in direct sunlight.
> After 1 hr, I removed the positive and had a perfect image of my pcb design
> on the pcb.
> This is when it starts to go wrong.
> I then placed the board in pre-made / purchased etching solution / ferro
> chloride.
> After much time, nothing has been etched.
> What am I doing wrong?
> Have I missed out something?

Yes. You're meant to put the board in developer.

From: stuart.lamble@...

>After much time, nothing has been etched
>What am I doing wrong?
>Have I missed out something?

You should have developed the image with sodium hydroxide solution.

I prefer the ready-made developer, but you can try a teaspoon of Caustic Soda in
a pint of water. It's pretty nasty stuff.

Wearing rubber gloves, stick your exposed board in the solution and scoosh it
about - you'll soon see when it's done.

Rinse it and then etch it.

Regards, Derryck

In a message dated 9/22/2002 2:34:39 AM Central Daylight Time, 
stuart.lamble@... writes:


> Have I missed out something?
> 

Didn't you "develop" the exposed PCB and rinse per instructions before 
putting in the etchant?????


[Non-text portions of this message have been removed]