Experimental Modern and Quantum Physics for Do-It-Yourself Science Enthusiasts 

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Home Book Chapters Chapter 2 - Light as Particles diy Low-Cost, Regulated, Variable, Low-Ripple High-Voltage (2kV) Photomultiplier Tube Power Supply
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diy Low-Cost, Regulated, Variable, Low-Ripple High-Voltage (2kV) Photomultiplier Tube Power Supply

diy Low-cost, regulated, variable-output photomultiplier power supply

The book’s Figure 32 shows the schematic diagram for a low-cost, variable-voltage PMT power supply based on a BXA-12579 inverter module that is originally designed as a power supply for cold-cathode fluorescent lamps.  This under-$20 module produces 1,500VAC at around 30kHz from a 12VDC input.

We are posting this picture to help you build your own power supply.  It shows the BXA-12579 that has been modified as described in the book.   The op-amp to the right of the CCFL module is used to control the voltage supplied to the module.  The high-voltage AC output of the inverter is rectified and doubled and filtered by the diodes and capacitors at the left of the CCFL module.

In addition, this design incorporates a circuit used by Spectrum Techniques to reduce ripple in their PMT power supplies.  The op-amp to the left is used to neutralize AC signals from the high voltage output by adding a voltage that is 180º out of phase with any signal that goes through its coupling capacitor.  A very stable and clean output can be obtained if the circuit is built within a grounded, metallic enclosure, being careful to prevent coupling of the high-voltage AC output into the rest of the circuit.

BXA-12579 CCFL Module datasheet: BXA-12579

 

Please visit www.prutchi.com and www.diyPhysics.com for other cutting-edge d.i.y. projects, and remember to check out our new d.i.y. Quantum Physics book:

 
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