variable-frequency power source?

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 ideas?

Thanks, George

What distortion can you tolerate?

martin

Been there done that.

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

Graham

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

George

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