Design an audio oscillator with a sinusoidal signal at 659.3 Hz. The signal must look reasonably sinusoidal on an oscilloscope with no clipping (while the speaker is attached) and the frequency must be reasonably close (within 10%) to 659.3 Hz.

materials provided: a breadboard, an LM741 opamp chip, an LM747 dual-opamp chip, a 2N2222A bipolar npn signal transistor, two 1N4148 silicon diodes, and a 64 speaker rated at 0.5W. Commonly-used resistor, potentiometer, capacitor, and inductor component values are available.