Producing Sinusoidal Waves with a Phase-Shift oscillator

Home, I say!

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I wanted to play with building oscillators, so here's the implementation of a classic design for the phase-shift oscillator, using bipolar transistors. This design is based on one of the projects from Radio Shack's 300-in-1 kits. (ah, one of the many joys of my childhood)



Here's a picture of the resulting waveform, displayed on my old vacuum-tube oscilloscope. Not bad, given the utter simplicity of the circuit. By my reckoning, I think this circuit was outputting at about 155 hz. I say this because it was closest to the note D# below middle C.