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I tried to google for a half day and I can't find it at all 
. There is a technique which was applied to miniaturize the PCBs, they were 2 boards and components were sandwiched between them, but all the components (through hole) were vertical and each component was connecting to both boards.
I found few techniques which are bit similar to this, but I can't find this one. I would be so happy 
if somebody could give me hints or point me to the right direction.
- Comments(1)
A****min
Nov 09.2019, 10:47:55
Its still occasionally useful e.g: when prototyping a large diode matrix* on stripboard - but for your sanity, don't build it fully sandwiched in case you make a mistake or damage a diode. Instead, for the top cross connects use the thickest tinned copper wire you can solder through drilled out holes without breaking the strips, bent to form a leg either side of the matrix, with all the diode top leads formed to hook over the wires. Stagger the legs in two strips either side of the matrix to allow for track cuts, and fly-wire them back to the rest of the logic.
