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What, specifically, is your question and problem?
Your circuit diagram is... confusing and ambiguous. First off, what kind of transmitter and receiver are you using? Are you using the USART? The information you have provided is not enough to help.
I upped the voltage on the power supply to 12-15V and saw symmetrical clipping, which makes sense. Why I didn't do that before... I don't know. Thanks for setting me straight.
Why the unsymmetrical clipping? I know the nature of the WIEN bridge oscillator is to drive the output to the rails, or very near them, but why would the negative swing be clipped and not the positive swing? I haven't built a WIEN bridge in years and I have yet to find a good answer, or any...
I've built a Wein Bridge Oscillator using a 741 Op Amp with the following parameters:
RF = 20k
RG = 10k
R = 16k
C = 10n
VCC = +5V
VEE = -5V
When I view the waveform on my scope, the positive swing of the sine wave has no noticeable distortion. The negative swing is clipped about 0.8V or so...
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