Abstract: A climate control system for an animal house having a plurality of climate control outputs such as heaters or ventilation fans has a control unit that regulates operation of climate control outputs. The control unit has a plurality of input terminals and a plurality of sensing devices, each of the plurality of sensing devices located in a different portion of the animal house and connected to one of the plurality of input terminals of the control unit with a connector to provide a signal to the control unit which is used to control the climate in the animal house. Each sensing device includes a thermal resistive sensor and an indicating LED configured to be selectively turned on by the control unit to indicate when the sensing unit is connected to the control unit.

Abstract: In a feedforward amplifier for amplifying an input signal in order to produce an amplified output signal, an error signal representative of distortion in the amplified output signal is produced and an adaptive linearization circuit is provided. In this adaptive linearization circuit, serially interconnected attenuator, phase shifter and error amplifier process the error signal to produce a feature-adjusted error signal. A coupling member combines the feature-adjusted error signal in the amplified output signal in order to cancel distortion in this amplified output signal, and a comparator/controller circuit is responsive to the error signal and the feature-adjusted error signal to control the attenuator and the phase shifter.