A small scale electrical generator includes an elongated substrate and a first piezoelectric fine wire. The system further includes a fluid communication system coupled to the cooling system components of the plurality of racks. In most applications, the connecting duct assembly attaches to a dryer manifold within the clothes dryer, where the air flow through the dryer manifold transfers through a heating element and into the tumbling area of the dryer. Alternatively, the transistors have different threshold voltages, or the driving signals for different transistors are output from drivers with different driving abilities, again causing the transistors to turn on sequentially. The sandwich is separated and the spacer is oxidized, which makes it grow to a required height whilst giving it insulatory properties, to allow for tunneling between the electrodes.