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Old 29th January 2006, 07:36 AM   #11
bees is offline bees  Netherlands
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he probably refers to something like this...


the problem with these is is that they are not stable enough...
a crystal oscillator is more stable ...
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Old 29th January 2006, 09:19 AM   #12
Onvinyl is offline Onvinyl
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Hi Bees and others,
in the longer run, I will build something like that for my garrard 401.
What should such a solution provide?
- most stable freq.
- pure sine wave without higher harmonics, 'no' distortion
- stable voltage amplitude
and, in case of my 401:
- power output stage with selectable output voltage swing between 140 and 220V. (to catch the point where the motor produces the least noise and rumble)

Are there any parameters missing?
How would a solution using a AD9835 perform in this respect?
Here is a ready solution (sine wave generation only)
The output stage might be the one from here

But I have no idea what would work best: a complete analog sine wave generator, a filter assembly like that of dhaen (or more up-to-date with filter chip) or digital-dac like in a dds.
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Old 30th January 2006, 10:43 PM   #13
DaBit is offline DaBit  Netherlands
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Do you know of a datasheet or appnote that illustrates your idea? A google search revealed much fancy stuff, but nothing I could track down to our task.
No, unfortunately not. But you could make it as 'simple' as an EPROM with address counter and DAC behind it, or as complicated as using an FPGA or DSP driving a H-bridge to synthesize the required waveform.

Originally posted by bees
he probably refers to something like this...

the problem with these is is that they are not stable enough...
a crystal oscillator is more stable ...
No, I did not. I referred to generating the sinewave digitally, and converting it to the analog realm using a nice audio-DAC.

However, I once used this XR2206 chip in combination with a 4046 PLL chip and a temperature compensated crystal oscillator. That generated a very stable sine also, although you guys might not like the distortion of the XR2206.

That Analog Devices chip looks good too!
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