Systems and associated methods for targeted ad delivery are described. The dispensing pipe is connected to the hopper and is configured for dispensing the materials in the hopper to a predetermined position. The auxiliary bipolar transistors can be biased such that the base currents of the auxiliary bipolar transistors compensate for a mismatch in base currents of the bipolar transistors of the input stage of an amplifier. Access information is exchanged between the wireless access components indicating capacity and current usage of each other’s outbound link to the Internet.