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-5v supply

Discussion in 'Electronic Basics' started by Data888, Aug 2, 2003.

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  1. Data888

    Data888 Guest

    Ok, another question. I have a +9v DC power supply, and I'm using a 7805
    to get +5v for the circuit. But I need -5v as well, and I can't seem to
    find anything to create that. The 7905 needs a -ve input voltage, and I
    don't have one to give it. A few people have suggested other
    semiconductors, but the electronics places near me don't carry them. So
    any suggestions?

    Nick
     


  2. There are chips that can generate a negative voltage from a positive supply.
    If your demand for current is not too high for the negative rail, you can
    try the ICL7660S, or the even better LTC1046. These can generate -5V from
    +5V with only two external capacitors. This is not a regulated output
    though, and can supply up to 50mA of current. Very handy for op-amp
    circuits.

    cheers,
    Costas
     
  3. Rich Webb

    Rich Webb Guest

    Hobby or production? If it's a home-brew project, MPJA has surplus
    +5 / -5 DC-DC modules for a buck (no pun intended) in quantity 1.
    Go to www.mpja.com and look for part number 2308 PS.
     
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