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4hv.org :: Forums :: High Voltage
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Requesting a double check

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Firnagzen
Sun Dec 05 2010, 02:28AM
Firnagzen Registered Member #567 Joined: Tue Mar 06 2007, 10:55AM
Location: Singapore
Posts: 147
Right, got it. Also, to all the people telling me to etch my own boards:

I know there's lots of easy ways to etch. But my main problems are:
a) Drilling. I don't have a drill press. Hand drill, to me, spells broken bits by the dozens.
b) Etchtant. Whether ferric chloride or persulphate, or whatever else, it's either illegal or impossible to get in small quantities in Singapore, that I've found so far.
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kiat
Tue Dec 14 2010, 08:41AM
kiat Registered Member #2115 Joined: Fri May 08 2009, 01:17PM
Location: Singapore
Posts: 46
Surely there are some shops in sim lim tower that can etch boards for you? I think I saw one in level 3, but forgot the name. I think it would be easier if you just build it on perfboard, though. Saves money and time.
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Mads Barnkob
Tue Dec 14 2010, 11:44AM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
I drill all my PCBs with a handheld accu using 1 mm bits, they become worn before broken, i recently did 400+ holes, my arm got very tired :)
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genious 7
Tue Dec 14 2010, 08:20PM
genious 7 Registered Member #2887 Joined: Sat May 29 2010, 11:10PM
Location: Panama City, Panama
Posts: 107
There have to be stores that sell etchants somewhere. If you can't find ferric Chloride, try Oxygenated water + Hydrochloric acid (Muriatic acid), just google that combination. Im sure you will be able to find one of the two. as for the bits, a couple of them will endure drilling the holes without a drill press. After all, they arent too expensive. Just avoid carbide bits when not using a drill press, as they break easier than the steel ones.
I'm sure you will be able to find Muriatic acid and Oxygenated water somewhere in Singapore. I can find them over here in Panama, so you will be able to find it there. Stick with the toner transfer method if only making a few boards.
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kiat
Wed Dec 15 2010, 07:34AM
kiat Registered Member #2115 Joined: Fri May 08 2009, 01:17PM
Location: Singapore
Posts: 46
BTW, NTUC sells HCl 'toilet cleaner/tile stain remover' in 500ml brown bottles, and you can get 3% v/v h2o2 at any pharmacy.

don't know if that will work though?
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genious 7
Thu Dec 16 2010, 10:44PM
genious 7 Registered Member #2887 Joined: Sat May 29 2010, 11:10PM
Location: Panama City, Panama
Posts: 107
don't know if that will work though?

Thats very similar to what I use.

3% Oxygenated water

Try to find the concentration of the HCL. It will probably be fine, nevertheless.
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Adam Munich
Thu Dec 16 2010, 11:43PM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Link2

Problem solved.
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