Abstract: A butt-joint flashing article of manufacture for construction of buildings is provided comprising a relatively flat, planar back surface, and a ridged front surface, the back surface adapted to face a framed wall, and the front surface adapted to receive siding planks or sheets. The butt-joint flashing apparatus comprises a center ridge and a plurality of channels on either side of the center ridge, each of the channels being separated by substantially planar surface that can be of uniform height that is lower than the height of the center ridge. The butt-joint flashing can be symmetrically arranged about the center ridge. The center ridge is adapted to provide a substantially impervious seal between two planks or sheets of siding. The channels provide a path for water that can find its way into an area between the planks or sheets and a structural sheathing of a building out of that area.

Abstract: A laser diode driver circuit can comprise fast loop portion and a closed-loop portion. The closed-loop driver portion can provide a part of the current for a laser diode. The closed-loop drive portion output can be independent of a photodetector. The fast-loop driver portion can provide a second part of the current for the laser diode. The fast-loop driver portion can use the output of the photodiode to determine the output of the fast-loop driver portion.

Abstract: A current mirror is used to bias an amplifier which is connected to a multiplier.

Abstract: A voltage reference forces a constant voltage at the inputs to an amplifier, thereby negating a need for a dummy detector on the non-active input of the amplifier.

Abstract: A current mirror is used to bias an amplifier which is connected to a multiplier.

Abstract: A laser diode driver device including fast-loop driver portion and a closed-loop driver portion to provide current to a laser diode.