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variable-frequency power source?

Discussion in 'Electronic Design' started by George, Oct 21, 2005.

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  1. George

    George Guest

    We need 120Vac @ ~10w, adjustable (and fairly stable) over 50-70hz.
    Cost is an issue.

    Among other ideas:
    - std signal generator -> audio amp -> step-up transformer.
    - modify a UPS, so the frequency can be adjusted.

    Does anyone have any experience/thoughts on these, or other better

  2. What distortion can you tolerate?

  3. Tam/WB2TT

    Tam/WB2TT Guest

    We used an audio amp and a signal generator. At 20W output you can use a
    12V 2 amp filament transformer. Cheap.

  4. Barry Lennox

    Barry Lennox Guest

    I recently used the first route, an HP200CD, a Quad 405 Amp into a
    15-230vac transformer. It worked very well, but I did require a
    decent resistor across the amp output to keep it stable at all freqs
    (from 16 to 400 Hz)

    Barry Lennox
  5. Pooh Bear

    Pooh Bear Guest

    Been there done that.

    The amp isn't terribly happy with a typical psu on the output. Tends to
    trigger the protection.

  6. George

    George Guest

    Fairly gross: ultimately, the object is to simulate a gas-powered

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