Is this a suitable sine wave oscillator? how would I control the frequency?

Umm... the images don't appear using my browser. And the incandescent bulb is a critical part of the feedback loop for a Wien Bridge oscillator... you cannot replace it with a fixed resistor and expect a stable sinusoidal output. See this Texas Instruments application note for design methodology.

 

Use the 'Upload a file' button to upload images. Note the image size and types allowable.

 

Unless you are driving a speaker directly with the output, an LM386 is not a good part for a general purpose signal source. It is not a true opamp, has relatively low input impedances, and an intentional DC offset at the output that you cannot control.

Separate from that, a Wein bridge circuit is great for low distortion, but difficult to control and extra difficult to vary over any kind of reasonable frequency range. A phase shift oscillator is more simple, has better (ok, easier) amplitude stability, has distortion in the 1%-2% range, and can be varied over a small range by changing one resistor.

Besides the link in post #2, Linear Technology, the original National Semiconductor, and Analog Devices also have excellent app notes on sine wave generation.

ak

 

There are many ways to generate "sine waves," some with less distortion than others. Try perusing this Texas Instruments Application Note for ideas. Return here with questions. A triangle wave oscillator feeding a diode break-point shaper is easy to build.

 

A triangle wave generator is also a lot easier to change frequency: just change a single resistor.

 

And you can get everything you need in just one integrated circuit... the XR2206.

 

I thought about mentioning the 8038 as a sinewave source chip, but post #1 sounded to me like he wanted a native sinewave osc circuit.

Also, a diode breakpoint shaper is much more difficult to do in reality than in a schematic. Getting THD below 5% requires precision resistors, hand matched diodes, and thermal tracking, things that none of those zillion schematics mention.

ak

 

The ICL8038 is an obsolete part, no longer manufactured (at least by Intersil... there may be Asian clones) with no recommended replacements. See this datasheet.

I hesitated to recommend diode break-point generators because the "corners" cause considerable harmonic distortion, even with LOTS of diodes and precision resistors, etc. However, I used this method in the 1970s to generate audio tones over about two octaves of an equally tempered music scale. The result was pleasant enough to my ears, but would be probably be unacceptable to a trained musician. All depends on what the OP wants to do. The XR2206 does appear to be a viable substitute for the ICL8038, although I have never used one. Perhaps someone else here has experience with them? Feel free to chime in with comments.