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The 106HVRF-1 High Voltage Regulator and Filter printed circuit board (PCB) is a very versatile design producing well filtered and regulated high voltage for various nuclear detectors used in logging tools. It is designed to operate with the old Corotron regulators or the new Codatron High Voltage Shunt Regulators. See High Voltage Tips & Tricks for a more detailed discussion of some of the features included on this handy board. One, two, or three stages of filtration are jumper selectable, and R4 can also be jumpered out (R4 determines pulse height in two wire GO style photomultiplier voltage dividers, but is not needed in some applications). A neon lamp is normally used to boost the output voltage about the same amount as filter network losses and to give a visual indication high voltage is present, but said lamp can be jumpered out if not desired. The output can be boosted the amount of the line voltage; this feature is jumper selectable, but line need not be connected to the PCB if this feature is not used. Regulator shunt current is measured across R6 (10 kilohm) at test points TP1 and TP2. Input series resistor R5 and pulse height gain resistor R4 are turret terminal mounted for ease of selection or change on a fastened board. The 106HVRF-1 PCB is jumper configurable to be compatible with either armor / chassis negative or armor / chassis positive line power. The 106HVRF-1 PCB measures 0.8 inches wide and mounts on 4.5 inch centers.
The 106HVRF-1 High Voltage Regulator and Filter 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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