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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 10-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 10-turn trimpot mounted on the board. The 106PD-3 PCB is jumper configurable to be compatible with either armor / chassis negative or armor / chassis positive line power. 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. 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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