Homebrew PCBs

On Sun, 8 Apr 2018 15:03:03 -0400, you wrote:

>Thank you.
>I was not reusing solutions.
>And... I was not using a bubbler.
>I am more of a hobbyist.... not doing high production... so I never pursued
>how to reuse and revitalize the solution.
>

If you do one or two at a time, that's one thing.  I generally did a
run of 5-10 double sided boards at a time, simply because the setup to
clean the boards, etch them and so on was time consuming.  I actually
got more done that way than trying to set up for a board, then three
days later, perhaps another one.

As long as the peroxide solution is fresh, you don't need a bubbler.

Mine was left over from the ferric chloride days, and then CuCl.


Harvey



>
>On 04/08/2018 02:09 PM, Harvey White madyn@... 
>[Homebrew_PCBs] wrote:
>>
>> On Sun, 8 Apr 2018 13:52:44 -0400, you wrote:
>>
>> >What do you mean by
>> >" If you are doing the copper chloride bit"
>> >
>> Peroxide/hydrochloric (muriatic) acid works well until the oxygen
>> provided by the peroxide runs out. The remnants are copper chloride
>> (CuCl). It will not etch a board by itself (Ferric chloride does
>> this, eventually, I think). However, by bubbling air through the
>> solution, the extra oxygen will allow etching. Perhaps a bit slower,
>> but it does etch. This particular solution has an indefinite life,
>> but needs to be adjusted every now and then for additional acid.
>>
>> Adding peroxide simply goes back to the original solution if you add
>> enough.
>>
>> If you look at the etching process in a clear solution, you will see
>> the copper turn dark in waves, this is the copper being oxidized by
>> the etchant.
>>
>> Harvey
>>
>> >
>> >
>> >
>> >
>> >On 04/08/2018 12:03 PM, Keith B kabowers@... [Homebrew_PCBs]
>> >wrote:
>> >>
>> >> For single use the 3% just adds more water.
>> >>
>> >> If you are doing the copper chloride bit
>> >> the 3% tends to add too much water and over
>> >> time upsets the chemistry.
>> >> I'm a newby, I've only been using my original
>> >> batch of CuCl for five or six years.
>> >>
>> >> On Sun, 8 Apr 2018 00:22:51 -0400, you wrote:
>> >>
>> >> >So what is the advantage of using 12% peroxide instead of the 
>> drugstore
>> >> >3% peroxide?
>> >> >
>> >> >I use 50ml of muriatic acid mixed into 100ml of drugstore peroxide.
>> >> >All of my etching is done in about 4 or 5 minutes.
>> >> >
>> >> >http://www.learnmorsecode.com/laminator/hotcakes.html
>> >> >http://www.learnmorsecode.com/ch/index.html
>> >> >http://www.learnmorsecode.com/DC/index.html
>> >> >
>> >> >Rob KB3BYT
>> >> >
>> >> >On 04/07/2018 05:22 PM, Keith B kabowers@... 
>> [Homebrew_PCBs]
>> >> >wrote:
>> >> >>
>> >> >> Look for clear hair bleach. I think it's around 12% (40 deg. 
>> Baume?);
>> >> >> strong enough to burn your bare hands.
>> >> >> I understand janatorial supply shops have it even stronger, but it
>> >> >> starts to get dangerous and these days may find the police checking
>> >> >> you out.
>> >> >>
>> >> >> I got mine from the local Sally Beauty Supply.
>> >> >> In this part of the US they seem to show up
>> >> >> near WalMarts.
>> >> >>
>> >> >> On Fri, 6 Apr 2018 21:45:00 -0700, you wrote:
>> >> >>
>> >> >> >Copper clad board using muriatic acid would like to find better
>> >> than 3%
>> >> >> >hydrogen peroxide if possible. In the usa LA california to be 
>> exact.
>> >> >> >Also what are some of the better methods of making a pcb cheaply
>> >> >> >BTW if needed I have 99 uv led on a circuit board built that a
>> >> while ago
>> >> >> >just would need a cheap uv kinda etch resist suggestions welcome
>> >> there.
>> >> >> >terramir
>> >> >>
>> >> >> ---
>> >> >> This email has been checked for viruses by AVG.
>> >> >> http://www.avg.com
>> >> >>
>> >> >>
>> >>
>> >>
>>
>>