A well pressure control assembly includes an annular pressure containment structure useful for manipulating pipe during drilling and other well operations performed with annular pressure at the wellhead. In a preferred embodiment, a circuit board apparatus includes a semiconductor package and an interposer for receiving the semiconductor package. The ESD power clamp is formed as a vertical npn transistor with its base and emitter coupled together. The matrix of detectors also detects a second image deformed by the optical element.