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Conductive pcb?

royston02
royston02 over 11 years ago

I want to know if I can use a conductive ink and use it with the atmega 2560(chip not board) with a few 555 and use it for my circuits? Wanted to know if I would have a problem with electro static discharge or resistance(since it has very high resistence) and I may also use conductive glue here and there. 

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  • dougw
    dougw over 11 years ago

    Your method can work. The main issues you will likely have are fragile circuit connections and as you mentioned resistive interconnections. You might try metal foil tape to reduce impedance of high current connections such as power supplies.

    It will also be quite difficult/tedious to make fine-pitch connections as both the glue and the ink will tend to flow beyond where you want. You may need exacto knife surgery after everything dries to clean up connections.

    Normal static precautions should be enough to prevent issues with static electricity.

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  • royston02
    royston02 over 11 years ago in reply to dougw

    St Louis Copper Crafts Metal Foil Sheet Roll - 36 Gauge - 12 inches x 5 feet: Buy Online @ Best Price | Snapdeal

    will It work?image

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  • dougw
    dougw over 11 years ago in reply to royston02

    Any metal foil can probably be made to work - you just need to scuff off any oxide layers before applying conductive adhesive.

    However, you can get metal foil tape with a conductive adhesive backing that will eliminate the need to glue the foil to a substrate.

    This is an example:

    1181 TAPE (1/2"X18YDS) - 3M 1181 TAPE (1/2"X18YDS) - TAPE, FOIL SHIELD, COPPER, 0.5INX18YD | Newark element14 Canada

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  • royston02
    royston02 over 11 years ago in reply to dougw

    won,t work with fragile thing like a bare chip. surgery will be complicated. I thing will work with at mega 328p. Any tutorial regarding dropping resistance?

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  • dougw
    dougw over 11 years ago in reply to royston02

    All non-solder methods of connection will have significant drawbacks, including using a breakout socket.

    I am not recommending this approach - just presenting it as an option if you need a solderless connection and can't find something better.

    The metal foil with conductive adhesive can be folded around a pin on the ATMEGA328P to make contact.

    To insulate this connection from other pins and connections, a layer of Kapton tape can be folded over the metal foil.

    Since both the metal foil and Kapton tape can be less than 0.1 mm thick, there is room to make connections to adjacent pins without crowding.

    I would sandwich the metal foil between 2 layers of Kapton instead of folding the Kapton - so the fold doesn't tend to spring open.

    Although it might work, it will be extremely ugly...

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  • dougw
    dougw over 11 years ago in reply to royston02

    All non-solder methods of connection will have significant drawbacks, including using a breakout socket.

    I am not recommending this approach - just presenting it as an option if you need a solderless connection and can't find something better.

    The metal foil with conductive adhesive can be folded around a pin on the ATMEGA328P to make contact.

    To insulate this connection from other pins and connections, a layer of Kapton tape can be folded over the metal foil.

    Since both the metal foil and Kapton tape can be less than 0.1 mm thick, there is room to make connections to adjacent pins without crowding.

    I would sandwich the metal foil between 2 layers of Kapton instead of folding the Kapton - so the fold doesn't tend to spring open.

    Although it might work, it will be extremely ugly...

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