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The following is a predesigned circuit that I would to have done and the shown box below.
The chip is known as the "8038" (originally made by Intersil, and now produced by several companies) and provides a reasonably clean sinusoidal output as well as triangle and square waves. The output frequency is set by a few external components. Another similar chip is the Exar XR2206, which has a little better stability and cleaner waveform than the 8038, but is harder to find. We will use the 8038.
I would prefer the Exar XR2206
The figure mfd_ckt shows 8038 signal generator circuit. This is a very standard configuration given in the Intersil data sheet. The output frequency is set by R1 and C1 (plus C2) to be approximately f=0.15/(R1*C1). The sine wave output at pin 2 is then fed through an R-C low-pass filter (R4-C3) to the LM386 audio amplifier. Figure 2 shows the PC board for this circuit. Note that the PC board includes some extra pads for opti...
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