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| mamalala:
--- Quote from: GK on February 11, 2013, 03:24:31 am ---BTW, does anyone know an affordable source of PCB tin plate power? --- End quote --- There are immersion tin mixtures available. One is "SUR-TIN" from Bungard: http://www.bungard.de/index.php?option=com_content&view=article&id=29&Itemid=80&lang=english#top9 Another one is "Seno Glanzzinn" (dunno if/under what name they sell it outside Germany). I still have some of the Bungard stuff left, ready to be mixed for 1 liter or more. I could send it your way, but i'm not sure if that is at all possible, since it's a few nasty chemicals.... Sulfuric acid, uric acid, and some powdery stuff. Strange that this stuff is so ridiculously expensive on Farnell. Here is German shop, for example: http://www.octamex.de/shop/?page=shop/flypage&product_id=53&category_id=538bc6e72af65cf55e7fcba4ee8c099f&/Chemisch_Zinn_kaufen.html Greetings, Chris |
| megajocke:
--- Quote from: GK on February 13, 2013, 10:45:47 am ---Oh no, another audio forum refugee :) How's it going? --- End quote --- Just fine! And you? On the subject of analog stuff with lots of components, recently a friend and I have been working on a microprocessor controlled polyphonic analog synthesizer inspired by the Rhodes Chroma. Though I guess using digital computers is cheating... ;) |
| GK:
--- Quote from: mamalala on February 15, 2013, 03:27:19 pm --- --- Quote from: GK on February 11, 2013, 03:24:31 am ---BTW, does anyone know an affordable source of PCB tin plate power? --- End quote --- There are immersion tin mixtures available. One is "SUR-TIN" from Bungard: http://www.bungard.de/index.php?option=com_content&view=article&id=29&Itemid=80&lang=english#top9 Another one is "Seno Glanzzinn" (dunno if/under what name they sell it outside Germany). I still have some of the Bungard stuff left, ready to be mixed for 1 liter or more. I could send it your way, but i'm not sure if that is at all possible, since it's a few nasty chemicals.... Sulfuric acid, uric acid, and some powdery stuff. Strange that this stuff is so ridiculously expensive on Farnell. Here is German shop, for example: http://www.octamex.de/shop/?page=shop/flypage&product_id=53&category_id=538bc6e72af65cf55e7fcba4ee8c099f&/Chemisch_Zinn_kaufen.html Greetings, Chris --- End quote --- Thanks for the offer Chris, but you're probably right, shipping the hazardous chemicals overseas probably wouldn't be viable. Yes the Farnell (Element 14) price for the powder is ridiculous. I didn't know that you could buy it as a mixture. Does that have a finite shelf life? I know the powder only lasts several months once mixed. |
| GK:
--- Quote from: megajocke on February 16, 2013, 02:49:19 am --- --- Quote from: GK on February 13, 2013, 10:45:47 am ---Oh no, another audio forum refugee :) How's it going? --- End quote --- Just fine! And you? On the subject of analog stuff with lots of components, recently a friend and I have been working on a microprocessor controlled polyphonic analog synthesizer inspired by the Rhodes Chroma. Though I guess using digital computers is cheating... ;) --- End quote --- I'm fine also. Lots of common ground between analog computing and analog synthesizer design :-+ . I've always been interested in the design of analog synthesizers and once had fantasies of building one myself (polyphonic, with lots of keys) but I'm not musically inclined, so in the end it would be a bit pointless. |
| mamalala:
--- Quote from: GK on February 17, 2013, 11:26:37 am ---Thanks for the offer Chris, but you're probably right, shipping the hazardous chemicals overseas probably wouldn't be viable. Yes the Farnell (Element 14) price for the powder is ridiculous. I didn't know that you could buy it as a mixture. Does that have a finite shelf life? I know the powder only lasts several months once mixed. --- End quote --- Yes, they all have a limited shelf life once mixed with water. It's usually around 6 months. If you keep it really cool, and use distilled water, it will last a bit longer. It doesn't stop working completely, but the tin layer wont be that shiny anymore, and it takes much longer to deposit on the board. Also, it partially crystalizes. You can re-dissolve them by heating it up and mixing it well again. Also, you have to solder the boards pretty quick once tinned. After a few weeks it will become virtually impossible to solder it anymore. You would have to give it a good scrub then, which probably will partially remove the tin layer completely. I used that stuff for a while, but don't use it anymore at all. It smells like foul eggs, has nasty chemicals, a limited shelf life, and it forces you to solder the boards quickly. The "Seno Glanzzinn" comes in a brown bag, no liquids. I guess that would be rather easy to send. A pack is around 19 Euro, plus shipping. Let me know if you are interrested, i could then forward one to you. One pack is good for 1 liter ready-to-use solution, about 40 Euro-Card sized boards (160mm x 100mm). However, you can get a can of leaded solderpaste, spread it on the boards and reflow that in an oven. Not the most beautiful thing, but it works well and protects the copper. Greetings, Chris |
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