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jkonz's avatar
jkonz
Aspirant
May 28, 2020
Solved

FS108 DC Power Supply

Hello,   I am looking for more information about what is the acceptable DC input power range for the FS108. The datasheet only says 7.5V at 1amp. But there must be an allowable range, can someone p...
  • antinode's avatar
    antinode
    May 29, 2020

    > Would like to know if either 5V or 9V would work instead of 7.5V.

     

       I'd need to look at the design of the regulator of the FS108 to
    decide that question.  My guess would be that higher would be more
    likely to work than lower, but whether the design would tolerate that in
    the long term is another question (to which I lack the answer).

     

       A quick+dirty(+cheap) scheme might be to put a couple of Si diodes in
    series with the 9V supply to drop/waste about 1.4V.  Not classy, but
    probably good enough.  And a little better than a direct connection to
    9V.