Homebrew PCBs

In a message dated 4/24/2005 8:51:45 P.M. Central Daylight Time,  
hermod.pedersen@... writes:


I  wonder if the amount of etch solution could influence the  result


Of course, but the "absolute amount" is irrelevant.  It only matters  that 
you have enough to etch the amount of copper involved!  One rule of  thumb I 
have seen published is cover a board laying flat with 6 mm of  etchant.  That 
assumes the container is about the same size/shape as the  board.  If a larger 
container, you could cover with less, or even "shlosh"  it carefully and 
continuously until done.  (Such shloshing is necessary  anyway!)
 
"Professional etching" is done with the boards vertical.  This means  special 
container shapes and board-holders, but a 18 mm wide container  large enough 
to hold the board involved is MORE than enough to etch one board at  the time. 
 
 
Now the total NUMBER of boards you etch with that same etchant in  whichever 
container is a function of the TYPE of etchant, the "ounce value" of  the 
board (copper-thickness), how much copper is removed for the particular  pattern 
involved, and the temperature of the liquid.  This is a matter you  will have 
to learn via your own  experience.              Jan  Rowland


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