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Telephone Question

Discussion in 'Electronic Design' started by AndyS, May 19, 2013.

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  1. AndyS

    AndyS Guest

    I have a Radio Shack Duofone Telephone Amplifier System
    Model 43-278

    I have been unable to find a schematic for it.....

    This is an "amplified telephone listening system" and has
    lots of transistors, etc, on an internal circuit board.

    There is no internal power source, no battery, no wall wart...
    The REN is 0.08

    So, my question is, where does the unit get it's power
    without loading down the telephone line ???

    Thanks for all informed opinions.....
  2. Edward Lee

    Edward Lee Guest

    Could be much higher, upto 48V DC. Line distance (resistance) could
    drop this somewhat.
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