These detectors consist of a silicon photodiode and a preamplifier chip integrated in the same package. The standardized packages allow for easy integration into optical systems. Both High Speed and High Gain detectors are highly sensitive over a wide spectral range. The close proximity of amplifier and detector minimizes stray capacitances, increases response speed and eliminates external noise pickup. High Speed detector applications include optical fiber communication, video signal transmission and optical disk pick up. The High Gain detectors can be used in low-light level applications such as analytical and measurement equipment. A variable gain can be achieved on the High Gain detectors by externally connecting a resistor in parallel with the built-in 1GO feedback resistor. These detectors are compatible with our C-Mount photodiode mounts. A power supply is required to operate the detectors.