This circuit operates from 12 volts and with the given values will oscillate at approximately 200 Hz. Its usable frequency range is from 5 Hz to 20 kHz. For best waveform use the pot to adjust the output amplitude to 2.25 volts RMS. The waveform is a pretty good sine wave. This circuit was taken from hjavascript:void(0)ere: http://www.angelfire.com/planet/funwithtransistors/Book_CHAP-5.html