A 555 produces a block wave, not a sine wave.
Interesting circuit - no timing cap.Indeed that will give you (kind of) a sine wave. But what do you plan to do with a 17 Hz sound? That's infrasound, people can't hear this frequency.
Can anyone recommend a simple complementary pair amplifier schematic for this application.Hopefully using BD139/BD140 which I have to hand.And sound quality is not a particular issue - it doesn't matter if there is a little distortion going on.Simplicity of schematic is more important than sound quality.
With this on pin 3 I will get a sine wave.
Let's call it an amusing experiment :-)