Hi everyone,

I am in need of a variable frequency AC power supply. The only problem, do they exist? I need something than can go from the low Hz to about 8kHz.

I know there are Variable frequency drives, but they are expensive and don't go into the kHz range.

What ways could variable AC frequency be achieved?

 

You need to be far more specific in terms of your requirements.

 

I need a power supply that will give me variable frequency AC from 100Hz-8kHz. I need the output power to be at least 60VA.

I just want to know if such a device exists which could do that? Or if I should look into other options.

 

Use an iPod and a frequency generator app. It can easily give the frequency range you cited, with enough power to drive headphones. If you need more juice, plug the iPod into your home theater or your guitar amp or your car stereo.

[oops] Yes, you'll need an amp.

 

build your own inverter yo

 

I need a power supply that will give me variable frequency AC from 100Hz-8kHz. I need the output power to be at least 60VA.

I just want to know if such a device exists which could do that? Or if I should look into other options.

Was that 60 VA @ Maximum load current of ??? Amps? That's why I said you need to be specific about your requirements.

 

60VA could be generated by an oscillator to the input of a high power audio power amplifier, depending upon the load you want to drive.

 

Was that 60 VA @ Maximum load current of ??? Amps? That's why I said you need to be specific about your requirements.

Sorry, 30V @ 2A.

 

60VA could be generated by an oscillator to the input of a high power audio power amplifier, depending upon the load you want to drive.

Ok, now that makes sense. I never thought of that. Exactly what I was looking for.

I was thinking I would have to have a motor generator or something like that....What you suggested is a great idea. Thank you!

 

60VA could be generated by an oscillator to the input of a high power audio power amplifier, depending upon the load you want to drive.

Exactly what I suggested in #4. I guess I wasn't clear.

 

....Vin → NPN Bjt → Vout
...NE555..LC_↑ (F-adj)

....Vin → N type Mosfet → Vout
...NE555..LC___↑ (F-adj)

 

Sorry, 30V @ 2A.

So you will need an audio amp that's rated for at least 65W into 16Ω, or 115W into 8Ω continuous power to get 2A @ 30V.

 

Kepco manufacturers bipolar DC supplies. Be warned that they are not cheap.

 

Thanks for the ideas everyone.
For some reason I never thought of using an audio amp.
Anyways, should make a great benchtop variable frequency ac power supply for all kinds of experiments.