[Ronja] Twister2 power problem

[Bruce M Simpson]

Karel Kulhavy wrote:
>> This is pretty much the only thing holding me back at the moment. The RX 
>> module I produced with Ondrej's SMD design and a laser printer works OK, 
>> but I'm out of etchant, and Maplin never seem to have ferric chloride in 
>> stock.
>>     
>
> Maybe you can buy hydrochloric acid in a drugstore and nails at an ironmonger's and
> throw them into the acid and wait until it doesn't dissolve any more? I guess
> it should dissolve. And don't forget to place it outside to prevent hydrogen
> gas accumulating in your home.
>   

It's funny you mention it, this sounds very similar to Tom Gootee's 
etchant solution, 1 part H.Cl. to 2 parts H202:-
    http://www.fullnet.com/~tomg/gooteepc.htm

I just went out and bought some "Spirits of Salt", as it is known here 
in the UK, which is Hydrochloric Acid at 32% concentration. I also got 
the 3% Hydrogen Peroxide.

Both are available from any real chemist's shop, not the abominations 
known as "Superdrug", "Boots" etc which used to be chemists.

Maplin continue to be out of stock of anything remotely useful, which is 
fast moving them into the same category, a sad but more general trend of 
high street stores seemingly being dumbed down in what they purport to 
deliver.

I randomly found a plastic cereal container as I walked out of the 
house, I aleady found one on an allotment on Friday which I have 
recycled into a bubble etching tank using an aquarium pump....

cheers
BMS