Rusell:
I have a few questions for you, I am attempting something similar to what Bill is doing and I was wondering what types of transparencies you use. I have an HP printer and 3m transparencies but whenever i try and print a circuit it is not nearly opaque enough. There are thousands of tiny little dots where it should be 'perfectly black'. In the past I have alleviated this problem by printing the circuit on three different transparencies and stacking them. This works but not very well. Any advice would greatly be appreciated!
Thanks!
Randy Knutson
Russell <
rjshaw@...> wrote: brainlessbill wrote:
>
> Hello All,
> I'm new to the group, and still a beginner at homebrew PCBs, so I'll
> introduce myself by hammering you all with a tough one (for me,
> anyways). I recently bought a couple of LCDs with Horz-Bottom SMD
> connectors (I should have read the not-so-fine print). The pins
> are .2mm wide on .5mm centers. Does anyone have a technique to etch
> these fine traces? So far I have only tried photoetching using
> transparencies and my Brother HL1240 printer, which leaves a few
> pinholes that I can't fill in. Also, the ferric chloride seems to
> undercut some of the resist that does remain after exposure.
>
> Any pointers would be appreciated. I had planned on using the LCDs
> for debug readouts for a PCB mill that I am building.
There's plenty of info in previous messages about getting
sharp 0.2mm traces using epson inkjet printers and transparencies.
I've done 240pin pqfp chips with 0.5mm lead spacing like that.
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