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-   -   Paper and Glue SMD (http://www.diyaudio.com/forums/construction-tips/217792-paper-glue-smd.html)

seanvn 12th August 2012 09:52 AM

Paper and Glue SMD
 
I have tried a number of PCB-less smd construction techniques. Double sided tape can work to some extent but it is highly dependent on the exact brand of tape you use and the adhesive employed. Generally it is not a very good way to proceed. The smd components tend to slid all over the place.

Much better is to stick smd components on paper with ordinary paper glue. Then solder the component ends together. You can use a single strand of copper for a multi-stranded wire to link everything together. After that you can wash the paper and glue off since the glue is water soluble. For whatever reason the components don't start to slide around when you heat them, unlike the tape method. The paper glue I used was likely some version of PVA adhesive. Anyway it was a clear viscous liquid.

miklos 12th August 2012 11:39 AM

Maybe a picture would be a good thing here.

marce 13th August 2012 12:33 PM

May I ask why?

seanvn 17th August 2012 05:08 AM

You may ask why. For one thing the resulting circuit can be very much smaller than when you use a PCB. For a second thing you don't have to make a PCB. You can pot the circuit using hot melt glue (melted in a bottle cap or something) which is a good thing to do because there a little strands of copper wire going everywhere.
Obviously it starts to become problematic when you trying to use SMD IC's. A quick solution for through lead component circuits is to use an eyelet wiring board. http://www.qsl.net/k0ff/K0FF%20Circuit%20Board/

sofaspud 17th August 2012 06:50 AM

Dead bug SMT.
DIY'ers rule!

marce 17th August 2012 09:35 AM

Neat way of doing it, to labour intesive for commercial. Untill I saw the dead bug comment I didn't picture what you were doing. You must have some patience.
Hot melt glue for potting is used for commercial assemblies, especially automotive, its called low pressure moulding.
Low pressure injection moulding, Overmoulding , Macromelt polyamides, Cavist MoldMan

qusp 31st August 2012 01:52 PM

take up les space than a multilayer PCB? I dont think so


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