I have a problem which I dont know how to fix with my circuit. I want the oscillation to start from 0V. The objective of this project is to design and practically implement an audio frequency sinusoidal oscillator with the following characteristics and steps:

• Power Supply: The power supply voltage can be unipolar 11V or bipolar 11V and -11V.
• Output Voltage: The output sinusoidal voltage must be adjustable (variable) with an amplitude between 0mV and 100 mV
• Output Frequency: The output signal frequency must be adjustable (variable) between 100hz and 1khz
• Load Resistance: The circuit must drive a pure resistive load with a resistance of 400

 

Hello,

Perhaps this page might interest you:
https://techlib.com/electronics/audiooscillators.htm

Bertus

 

It would naturally start from 0V if you used the ±11V supply option.
Your supply rail splitter is much too high impedance for the rest of the circuit.
Your gain network has an impedance of about 1k, yet you are using 10k resistors as rail splitters.
For a rail splitter to work, its impedance must be about 10x LESS than the circuitry it drives. You achieve that in the easiest way by using a genuine split supply.
Apart from that, your oscillator circuit seems OK

Hint: For the output driver - use a diamond buffer.

 

Is this homework?

 

Thanks Bertus and Ian for sharing those websites. Pure gold!

 

I have added that website to Wendy's Index.