| Electronics > Repair |
| Repairing carbon traces on a Casio WK-110 keyboard PCB? |
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| squadchannel:
--- Quote from: Agent24 on July 22, 2024, 11:17:32 am ---Does anyone have experience to suggest _against_ the Indian ink idea? --- End quote --- I think "Indian Ink" probably means the same thing as "India Ink". If you are referring to the black ink used in calligraphy, this is something that is dissolved in water, not something that can be glued on. Someone in my language experimented with conductivity, who sprayed cloth with a conductive spray, smeared it with the purpose of further reducing the still high resistance, and used it as a flexible conductive cloth. He said it was about 50-500 ohms. It might be possible to mix epoxy with carbon or metal powder and make it conductive, but I've seen articles before that say no matter how much you mix it, it will never be conductive. If you want to experiment with india ink, there is Inkstick in solid form. |
| richnormand:
I have had great success over the years using Ted Pella Inc. PELCO Colloidal Graphite in an isopropanol base. https://www.tedpella.com/technote_html/16053%20TN.pdf https://www.tedpella.com/SEMmisc_html/SEMpaint.aspx#_16053 It is not expensive and I use it for my SEM but it works great for oven controls, remote controls, corroded connections (low current) and seems to be stable for years. |
| Agent24:
--- Quote from: richnormand on July 22, 2024, 10:19:48 pm ---I have had great success over the years using Ted Pella Inc. PELCO Colloidal Graphite in an isopropanol base. It is not expensive and I use it for my SEM but it works great for oven controls, remote controls, corroded connections (low current) and seems to be stable for years. --- End quote --- That product also sounds great, but it would seem there's no easy way to get it in New Zealand either. Their closest distributor is in Australia, who sell the product for $40, and which requires a hazardous goods shipping service, and I don't think I want to know how much that costs. All the "science supply" shops I can find in NZ only sell stuff for optical microscopy, not SEM. Maybe there are no local shops that stock such products. I imagine universities and other customers just include such supplies in large bulk orders from overseas, at which point the hazardous goods freight cost is negligible? |
| richnormand:
Ask around universities or labs that use SEMs, there might be an similar alternate product they use. It is about US$8 here (but you get beaten on shipping for small orders). Looks like there are lots of people greasing their paws along the way..... Now, even at that price you will have a lifetime supply (if it works well for your application). Best of luck finding something that works for you. Cheers |
| VK2AZT:
The Jaycar Wire Glue will work. I used it before for almost the same purpose. It's a bit thick and viscose but you should be able to use it if you are careful. It takes about 12 hours to fully cure. Cheers. |
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