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if you increase the oscillation frequency, do the dots go away? im guessing it has something to do with the oscillation frequency being a multiple of the sampling frequency, so youre getting periodic points. i dont know that scope very well, but sometimes there is a "vectors" setting in the display menu for showing just points or connecting the dots.
In the second plot from the scope the menu says the display type is set to dots. Try to change the interpolation method to sin(x)/x to see if it makes a difference.charonme wrote: btw I don't know why the plot is a discontinuous patch of blotches instead of a nice thin line. I tried different scope settings with no luck
[Edit] I also notice that the sample rate is 100Msps or 250Msps in your plots. If you don't have a very deep scope memory, each sweep may only catch a small portion of a period of your signal and may be displayed as a dot per sweep. In this case, try to lower the sample rate to cover more than one period of the signal per sweep.
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The ChaQuO module was developed over 10 yrs ago, both in DIY and commercial versions. It includes a 3 opamp quadrature osc with a dual pot for tuning.charonme wrote:thanks
I might have to downgrade my expectations, so perhaps a 3 or 4 op-amp circuit would be OK, but I still want a sine and a cosine LFO output controlled with one pot
(See the doclink for the pdf doc)
Looks like someone posted a somewhat similar schematic above; this is my original version. It uses a x-x^3 nonlinearity rather than clipping.