Abstract: An apparatus includes a first member having a housing that encloses a power source and a controller, a second member coupled to the first member that is seeded with a target product, and a sensing module coupled to the first member to allow power from the power source to be transmitted to the sensing module and sensor data from the sensing module to be transmitted to the controller. The sensing module including a sensor oriented toward at least a portion of the second member. The sensor configured to obtain sensor data associated with at least one characteristic of the target product.

Abstract: An overhead door safety system includes a loading dock having a loading dock wall defining an opening. A truck and trailer door safety device is mounted to the loading dock wall. The truck and trailer door safety device includes a mounting bracket adapted for mounting to the loading dock wall and a swing arm. The swing arm includes an arm extension portion and a pivot portion. The pivot portion is pivotally mounted to the mounting bracket so that the swing arm pivots about a pivot axis between a retaining position and a storage position. In the retaining position, the arm extension portion is disposed beneath an overhead door of a truck positioned adjacent to the opening of the loading dock wall to prevent the overhead door from closing.

Abstract: An overhead door safety system includes a loading dock having a loading dock wall defining an opening. A truck and trailer door safety device is mounted to the loading dock wall. The truck and trailer door safety device includes a mounting bracket adapted for mounting to the loading dock wall and a swing arm. The swing arm includes an arm extension portion and a pivot portion. The pivot portion is pivotally mounted to the mounting bracket so that the swing arm pivots about a pivot axis between a retaining position and a storage position. In the retaining position, the arm extension portion is disposed beneath an overhead door of a truck positioned adjacent to the opening of the loading dock wall to prevent the overhead door from closing.

Abstract: An audio filter circuit is formed from a pair of cross-coupled, symmetric filters, each filter having a first stage comprising a single-pole, inverting low pass filter followed by a second stage comprising a two-pole, non-inverting Sallen-Key low pass filter. The circuit is readily switched between single-ended and double-ended output, while maintaining comparable noise and gain characteristics. The gain of the circuit is readily adjustable over a range of gains.