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I am fascinated by free form circuit (I hope it's the right name): circuit that does not require a pcb. Does anyone know some resources about that?

nkint
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    The name is usually Rat's Nest, and they're great for whacking something together quickly. Unfortunately they are more or less un-repairable, totally un-duplicatable, and somewhat wanting on the robustness front. Use wisely. – Neil_UK Nov 14 '16 at 12:39
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    Wasn't this favoured by EEs of the Bob Pease / Jim Williams era? If you look in the low-numbered App Notes by Linear Technology (esp 47) there's some good examples. The combination of ground plane and air dielectric makes them work surprisingly well for high-frequency analog work. – pjc50 Nov 14 '16 at 13:39
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    aka "dead bug" style –  Nov 14 '16 at 15:36
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    Related: http://electronics.stackexchange.com/questions/248354/are-circuit-boards-necessary - nice pictures in there. – dim Nov 14 '16 at 15:38

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Something like this, maybe? (pad)

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EM Fields
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  • ... or like [this](http://www.computerhistory.org/atchm//wp-content/uploads/2012/08/williams-thermometer-sculpture.jpg) (originally from [here](http://www.computerhistory.org/atchm/an-analog-life-remembering-jim-williams/)) – Nick Alexeev Nov 14 '16 at 19:50