variable-frequency power source?

[George]

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

 

[martin griffith]

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

 

[Tam/WB2TT]

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

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

Tam

 

[Barry Lennox]

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.

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

 

[Pooh Bear]

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.

Been there done that.

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

Graham

 

[George]

What distortion can you tolerate?

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

George