observer blocks---------------------------------------------------------------------------------------------------6 diamonds per stack
pistons --------------------------------------------------------------------------------------------------------------10 diamonds per stack
sticky pistons ---------------------------------------------------------------------------------------------------16 diamonds per stack
redstone repeaters ------------------------------------------------------------------------------------------4 diamond per stack
redstone comparitors --------------------------------------------------------------------------------------5 diamond per stack
redstone torches -------------------------------------------------------------------------------------------- 1 diamond per 2 stacks
droppers -----------------------------------------------------------------------------------------------------------1 diamond per 2 stacks
dispensers------------------------------------------------------------------------------------------------------- 1 diamond per 1 stack
hoppers ----------------------------------------------------------------------------------------------------7 diamond blocks per stack

12db+4dias Thanks haha :)