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Hmmm 0.1Hz -> 200 is a wide range, better to use standard Sine generator ICs.
around 10 years back i had developed a sine wave from a Triangle wave, i had used Diode clippers to generate the same,
Even Filtering can be used to filter out a square wave to a sine Wave.
i had studied a simple one but looking here it makes the topic more complex let me know how can we convert a triangle wave generator into sine wave generator
The nonlinear clipper method (like in the old Intersil 8038 chip) approximately converts a triangle wave into a sinewave over a wide frequency range, but you will typically see one or two percent distortion. Here's an ICL8038 data sheet - see the right side of the schematic on page 4: **broken link removed**
A moderately sharp low-pass filter would work wonderfully, but you must tune the filter to follow the frequency of the input triangle wave or square wave. A switched-capacitor filter is easier to tune over a wide frequency range than an analog filter, however neither filter method provides automatic tuning.
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