The idea for making electronic projects on cardboard came from Ciat Lonbardes paper circuits. I had used veroboard previously. But it was a bit difficult to change more complicated designs to work on veroboard. Also making pcb:s at home seemed complicated with all chemicals, UV-lamps etc. Cardboard may not be the most sturdy material, but it is cheap, always available, environment friendly and it works. I also have a pretty good collection of circuit boards from broken equipment. A lot of components (resistors, caps, transistors etc.) can be recycled from these. So using cardboard pcb and recycled components you can build electronic projects at home more environment friendly and you don’t need to spend any money on the parts. (Of course some parts are a bit difficult to find from random broken equipment.)
1. you can print picture of the pcb you want on paper and then glue it on a piece of cardboard. Or design your own circuit by drawing it. Postcards can easily be used as material.
2.poke holes for the components with a needle or other sharp object.
3. insert the components and solder them according your pcb design. In most cases components reach each other with no jumper wire. But when using recycled components the pin are often cut bit too short so you might need jumper with them.
Bottom wiew of my wp-20 board
4. because device made on cardboard may be damaged easily. Protect it with proper housing.