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Generating 9V @ 10mA - isolated from supply battery

Discussion in 'Hobby Electronics' started by JERD, Oct 16, 2007.

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  1. JERD

    JERD Guest

    I have a need to generate 9V at 10mA that is totally isolated from a 12V car
    battery. That is no common negative connection between the car battery and
    the negative of the 9V supply. Any pointers on how I can do this would be

  2. Buy a 9 volt battery?

    Dorfus Dippintush
  3. chris

    chris Guest

    Depending on how much you want to spend (low power will be cheaper), you
    could use an isolated DC-DC converter eg Farnell sells a Traco TEL
    2-1212 9-18V in 12V out 2Watt for about $35.

    A linear reg on the output can get you to the 9V since a ready-made 9V
    output is less common.

  4. Franc Zabkar

    Franc Zabkar Guest

    Scrounge a 5V-9V DC-DC converter module from an old 10base2 NIC and
    step down the input using an LM7805.

    - Franc Zabkar
  5. Andy

    Andy Guest

    How about using the SRS-1209 listed on this page:

    Problem solved for under 8 bucks...........

  6. Farnell have a whole range of isolated DC-DC converters.
    102-1604 for example is a 12V to 9V isolated converter @ 111mA.
    Bit pricey though.
    You could use a cheaper 12V-12V one and use a 9V regulator on the

    Alternatively, use a battery.
    A D cell battery pack would last several months at 10mA continuous.

  7. JERD

    JERD Guest

    Thanks for feedback guys. Most helpful and I now have some options!

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