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Old 4th September 2012, 07:45 PM   #1
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Default Seek pure sine wave oscillator schematic ...

Hi DIYers

I'm looking for a simple pure sine wave oscillator schematic delivering a pure sine wave somewhere in-between 250 Hz and 1 kHz.

Output voltage is flexible as it is to be used for generating an appr. 2 * 80 VAC/50 mA sine wave through a transformer. I need to transform an off-the-grid battery voltage in a very low noise way into +/-100 VDC voltages.

Basically, I just need a schematic for a suitable low noise oscillator and then I can add an output stage at the end.

Any of you know of such a schematic?

Thanks for reading & maybe replying

Jesper
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Old 4th September 2012, 10:44 PM   #2
DUG is offline DUG  Canada
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21,000+ replies

There must be something in this thread that would help you

Low-distortion Audio-range Oscillator
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Old 5th September 2012, 10:59 AM   #3
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Hi DUG,

That were many replies :-)

I've read a bit in the thread you are linking to, however, these designs typically are a bit too complex for my purposes. But it made me search on Linear's webpages for some of the opamps and they have some schematics for very simple oscillators that only require a few components and are reasonably pure & stable for this purpose.

So, although not in a direct way your link set me off in the right direction ;-) So no further replies needed...

Thanks again,

Jesper
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Old 5th September 2012, 01:07 PM   #4
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Why do you need a pure sine wave when at the receiving end it gets rectified ?
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Old 5th September 2012, 01:41 PM   #5
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wien-bridge oscillator driving a pwr amp driving a transformer with two output for a fullbridge rectfier. Need to get some low pwr lightbulbs and find the one that works best for you.
Did this for a 115vac (US bought compressor) that was to be run off 230vac. Could have used a 230-115 transformer, but I wanted to experiment with 60-400Hz operation, besides it was something to do...
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Old 5th September 2012, 05:59 PM   #6
AndrewT is offline AndrewT  Scotland
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Can't be done, no matter how much expertise and/or money is thrown at it.
Oscillators could have anywhere from 10% distortion to 0.001% distortion.

Choose where in that range you need to be to get the application to work.
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