Homebrew PCBs

I'm working on a HF amp layout now based on the EB104 design (pretty well followed by modern manuf on their HF amps).  Since max freq would be 30 mhz (maybe 50?) 1/4" mesh would be ok.  The current carrying is primary with the copper heat spreader below anyway.

A copper mesh would look better than the solid copper with pin holes all in it.... I think<:)

OK, thanks for all the help.

Ken H>

--- In Homebrew_PCBs@yahoogroups.com, Malcolm Parker-Lisberg <mparkerlisberg@...> wrote:
>
> It does not have to be fine, unless you are at microwave and above frequencies. A course mesh is good enough, 1/4" is fine.
> 
> Some pcb packages have a mesh fill option.
> 
> Malcolm
> 
> Â 
> I don't suffer from insanity I enjoy it!
> Mene, mene, tekel, upharsin
> The writing is on the wall.
> 
> 
> ________________________________
>  From: sailingto <sailingtoo@...>
> To: Homebrew_PCBs@...m 
> Sent: Thursday, March 15, 2012 5:21 PM
> Subject: [Homebrew_PCBs] Re: ground planes
>  
> 
> Â  
> I had wondered about the photo etch method and if it had this problem.
> 
> The mesh method is mentioned - do you mean use a very fine mesh pattern for the solid ground plane?  I'm not sure how to do this in Eagle or ExpressPCB programs.  Sounds like a good idea - mesh fine enough it "looks" solid on transfer?
> 
> With the normal transfer, the ground plane "looks" like it has good toner transfer - very black.  BUT, on etching it doesn't look so good with many tiny holes showing.
> 
> Thanks for the suggestions and info - I might have to try photo - etching.  That does seem to have better results.
> 
> Ken H>
> 
> --- In Homebrew_PCBs@yahoogroups.com, Malcolm Parker-Lisberg <mparkerlisberg@> wrote:
> >
> > Use a mesh pattern, rather than solid. It happens because the electrostatic charge migrates from large areas.
> > 
> > Malcolm
> >  
> > I don't suffer from insanity I enjoy it!
> > Mene, mene, tekel, upharsin
> > The writing is on the wall.
> > 
> > 
> > ________________________________
> >  From: sailingto <sailingtoo@>
> > To: Homebrew_PCBs@yahoogroups.com 
> > Sent: Thursday, March 15, 2012 3:15 PM
> > Subject: [Homebrew_PCBs] ground planes
> > 
> > 
> >   
> > Does anyone have problems getting large ground plane areas to stay good 'n solid with copper?  I've been having a bit of problem with large ground plane areas using toner transfer method.  If I do a board without a large ground plane, the traces look good - trace size ranges from .015" to .050" or so.
> > 
> > I clean copper good, wash with alcohol.  Toner transfer at 360ºF with a laminator using Pulsar toner transfer paper, then etch in HCl and H2O2.  I used the green film last board and it seems a bit better, but not sure about large areas yet.
> > 
> > Just checking to see if anyone else has this problem, or maybe found a solution...... or maybe it's just me?
> > 
> > Thanks for any guidance and suggestions.
> > 
> > Ken H> 
> > 
> > 
> > 
> > 
> > [Non-text portions of this message have been removed]
> >
> 
> 
>  
> 
> [Non-text portions of this message have been removed]
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