I have a schematic of some electrical components and something is marked +9/7.2V. What exactly does that mean? I presume the 7.2V means 7.2 volts, but what about the +9/ part?

It is a PB Board for powering some fans in a plasma television. The number is for the connection of the fans to a small board. Since i am not a great expert on these things (hence the possibly simple question), I don't really know how else to explain it.

Any information would be greatly appreciated!

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    \$\begingroup\$ What is the "something"? \$\endgroup\$ May 22, 2011 at 21:06
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    \$\begingroup\$ My guess would be that the device is a six-cell battery; six NiCd or NiMH cells will provide about 7.2 volts, while six ZnC or alkaline cells will produce about 9 volts. The device probably expects six batteries to be installed, and is prepared to operate correctly with anything between 7.2 and 9 volts. \$\endgroup\$
    – supercat
    May 23, 2011 at 1:20
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    \$\begingroup\$ Post a picture! It would help tremendously. \$\endgroup\$ May 23, 2011 at 9:36
  • \$\begingroup\$ @supercat - why not post this as an answer so that people can vote for it. \$\endgroup\$
    – stevenvh
    May 23, 2011 at 16:22
  • \$\begingroup\$ @Joe: Did someone post a rude comment under your answer? I never saw either. I posted a comment rather than an answer because, at the time I replied, the question was rather vague and I didn't want to put up an "answer" without more information about what was really being asked. \$\endgroup\$
    – supercat
    May 23, 2011 at 17:43

1 Answer 1


7.2V at 1.2V per cell is a 6 cell battery.

9V at 1.5V per cell is a 6 cell battery.

It is most likely able to handle that range, so it can deal with NiCd/NiMH cell or standard Alkaline cells on battery powered instances.

Edit: Looks like this is a duplicate of what supercat posted in the comments. Sorry I missed that.


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