A trash can assembly positionable upon a surface is provided. The digitally controlled oscillator includes a pair of transistors cross-coupled to each other, a switched capacitor array coupled to the pair of transistors and a plurality of frequency tracking units coupled to the pair of transistors. The wall anchoring portion has a circumferential surface which comprises the thermoplastic material and energy directors. Other features of the innerduct structure relate to the material of which it is formed. The voltage buffer amplifies the clamped signal or the test signal to generate a buffer signal.