Hi all, I'm making a custom application and I need a source for a device that takes 300mA - 48VAC at 50 Hz to power. I can easily get the 48V, but how can I get it to 50 Hz?
All I've got so far is just trying to rectify it and then using a function generator, but is there another way that wont take up too much space in my design?


the proposed rectifier

 

Is 50hz critical for the device?

 

Are you certain the device can't operate from 60Hz?

Otherwise you could use a 50Hz sinewave oscillator to an audio amp IC driving a transformer.

 

Is 50hz critical for the device?

It is critical for the device; I know it can work with 60, but for testing policy's sake, it has to be 50 Hz.

 

Are you certain the device can't operate from 60Hz?

Otherwise you could use a 50Hz sinewave oscillator to an audio amp IC driving a transformer.

Yep, its gotta be 50.

Could I get the 300mA from the setup you describe?

 

It is critical for the device; I know it can work with 60, but for testing policy's sake, it has to be 50 Hz.

Hire or purchase a power supply ,
many around that can give out the frequency / voltage you need

 

Could I get the 300mA from the setup you describe?

Yes.
The output is 14.4W which can be generated by a number of IC audio amps.

So this is a test circuit?
Why the size constraint?

 

Can you just use a 48vac 50Hz power supply? Do you really need something that fits into your device?
For a quick and easy solution, I would...
-download a sine wave signal generator app to my iPad or phone
- plug the phone into my 100w/channel stereo receiver.

Connect the output to a 2:1 step-up transformer to get your 48vac. You'll need a monster mower receiver to get to 48vac without a step up transformer.

Just adjust volume knob to set voltage and use the app to adjust frequency and waveform.