This multi voltage DC power supply circuit uses three IC regulators to supply +5, +6, +9, and +12 volts regulated from a nominal 12V supply. It is a nice project, simple to build, and great to have on the workbench. It's Cap Values are four (4) 0.1uF disc and a single (1) 3300 uF (electrolytic). Three Regulators, LM7805, LM7806 and a LM7809 Use any type of 12 volt battery for the source and add some form of clips to attach the unit to the battery. A great addition to the workbench.