The Basic Circuit Board (formerly Small Circuit Board) is an item from the Forestry mod. It is used as a crafting ingredient for some of the Forestry machines as well as an insertable upgrade to the Electrical Engine and the MultiFarm, a completely redesigned multi-block farm added with Forestry version 2. As an upgrade it needs an Electron Tube soldered to it with a Soldering Iron.
The Basic Circuit Board can only hold one Electron Tube. For a description on how to add Electron Tubes to Circuit Boards, see the page for the Soldering Iron.
also in the Genetic Machine