| 摘要 |
PURPOSE: A printed circuit board is provided to allow for ease of mass production of ballasts having different number of watts or sizes. CONSTITUTION: A printed circuit board comprises a first substrate(10), a second substrate(20), and a coupling unit. The first substrate has a surface on which components constituting a first circuit commonly used in fluorescent lamp ballasts having different number of watts, are mounted. The second substrate has a surface on which components constituting a second circuit for determining number of watts of the fluorescent lamp ballasts, are mounted. The second substrate is coupled onto the first substrate such that the second substrate is attachable/detachable to/from the first substrate. The coupling unit fixes the first and second substrates at the state where the first and second substrates are electrically connected with each other. The coupling unit includes a plurality of access holes(11) formed on the first substrate; and a plurality of pins(21) protruded from the second substrate and inserted into the respective access holes.
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