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transformer needed

Discussion in 'General Electronics Discussion' started by hoolko, Mar 15, 2013.

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  1. hoolko


    Mar 14, 2013
    i need inexpensive simple ac to dc transformers....110v input and 100vdc output 1amp can anyone tell me where to buy? thanks, Nick
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    First, transformers don't produce DC, only AC. So what you need is (possibly) a transformer, rectifier and a filter to produce something very much like DC.

    Secondly you don't specify the required current. This is a major factor in choosing components.

    Thirdly, 100VDC is hazardous, and you're unlikely to find something "off the shelf"

    What you possibly need is a 110 to 70 VAC transformer followed by a 200V bridge rectifier, followed by some filter capacitors (150V at least). The actual choice of these components would depend on the required current.

    The output voltage would probably exceed 100V without a load and would reduce as a load is applied. In addition, the DC would have a ripple superimposed on it, the amount of this ripple being determined by the size of the filter capacitors and the current.

    So no simple answer.

    Now it's also possible that you might find a switchmode power supply capable of 100V, but that may be tricky. Two rated at 48V would be easier to find and you may (emphasis on MAY) be able to connect them in series to give you a 96V DC source. Again, the required current is essential to know.
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