I looked at the XR2206 datasheet. It has a "sine shaper", but from the schematic it isn't a resistor-diode network. It's not immediately obvious to me how that

I looked at the XR2206 datasheet. It has a "sine shaper", but from the schematic it isn't a resistor-diode network. It's not immediately obvious to me how that sine shaper works. https://www.sparkfun.com/datasheets/Kits/XR2206_104_020808.pdf https://www.sparkfun.com/datasheets/Kits/XR2206_104_020808.p...