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The 106PD-3 Inverting Preamp and Discriminator printed circuit board (PCB) is a versatile radiation detector preamp primarily designed for use with photomultiplier based scintillation detectors. Gain can be set with a turret terminal mounted gain resistor R6, or with an on-board multi-turn trimpot (the PCB is configured to allow either). It is equipped with a comparator (111 / 311) based discriminator circuit with positive feedback to provide hysteresis for noise immunity. The positive feedback resistor R11 is also turret terminal mounted for ease of selection or change on a fastened board. Discrimination is accomplished with a multi-turn trimpot mounted on the board. Both the discrimination and the gain (if used) trimpots can be either the 3/8 inch square type (Vishay T93 or equiv.) or the low profile 1/4 inch square type (Vishay T63 or equiv.). The 106PD-3 PCB is jumper configurable to be compatible with either armor / chassis negative or armor / chassis positive line power. The two integrated circuits are ordinarily mounted in high quality machine pin sockets, but lower profile options are available if low clearance is required. It requires only a single 10-15 volt power supply to operate. The 106PD-3 PCB is 0.8 inches wide and mounts on three (3) inch centers.
The 106PD-3 Inverting Preamp and Discriminator PCB is part of the 106 Radiation Tool™ PCB family. 106 Radiation Tool PCBs can be used to upgrade or repair tools, or an entire electronics section can be assembled from scratch using several PCBs (as in reworking an old tube / Nuvistor tool). All 106 Tool PCBs use readily obtainable components, which parts will continue to be available for many years to come, and all use convenient turret terminals for wiring connections. We prefer through-hole components for PCBs designed to survive high temperature, but selected components may be surface mount (SMT), or have provisions for either through-hole or SMT where space or price and/or availability is an issue. Due to time constraints on maintaining this website, the PCB illustrated below may not be the most recent revision of the board and / or circuit.
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