When playing Bob's Electronics, it suddenly came to me: why do I need wooden boards to make basic circuits when I have phenolic boards? It doesn't make a lick of sense for anyone to be this ass-backward.
It costs 1 resin (10 wood) and 1 wood to make 2 phenolic boards, that means to make 1 phenolic board you need 5.5 pieces of wood, and 1 wood = 2 wooden boards. So here goes, you can convert 1 phenolic board to 11 wooden boards.
Research the conversion technology after Advanced Electronics and the recipe should show up for handcrafting and assembling machines.