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The 106PD-1 Non-Inverting Preamp and Discriminator printed circuit board (PCB) is a versatile radiation detector preamp similar in design to the preamps used by Comprobe in its 104 and 105 tools. It works well with photomultiplier based scintillation detectors using a CA3140 or equivalent op amp, but it is also capable of working with He-3 neutron detectors using a LF157 or equivalent op amp. Gain setting resistors R4 and R6 are turret terminal mounted for ease of selection or change on a fastened board. It is equipped with a comparator (111 / 311) based discriminator circuit with positive feedback to provide hysteresis for noise immunity. The positive feedback resistor R12 is also turret terminal mounted for ease of selection or change. Discrimination is accomplished with a 10-turn trimpot mounted on the board. The 106PD-1 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-1 PCB is 0.8 inches wide and mounts on three (3) inch centers.
The 106PD-1 Non-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 wire 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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