Homebrew PCBs

What strength hcl are you using? The ratio is easily understood, but 
it all depends on the strengths. (I see you use 3 percent h2o2.)

Thanks
Dave

-=-=-=-

>I use this technique all the time. I can do a 4X6 inch board in 
>about 2 minutes. I use 1 Part HCL and 2 Parts 3% H2O2. I make just 
>enough etchant to cover the board about 1/8 to 1/4 inch and lightly 
>brush the surface with a foam Paint brush. I etch at room 
>temperature. Works very well for me.
>
>I've also tried 1 part HCL and 2 parts 12% H2O2 but the reaction was 
>too fast and hot to control easily.
>
>
>
>--- In Homebrew_PCBs@yahoogroups.com, "tda7000" <Tda7000@...> wrote:
>>
>>  I see some people get very fast etch times with a sponge and 
>>ferric chloride...
>>
>>  But has anyone tried that method with the HCl and H2O2 solution, 
>>or the cupric chloride?
>>
>  > Or anything else for that matter?