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Old 16th September 2008, 11:30 PM   #1
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Default HV Shunt Regulator PCB

This project had been on the back burner for some time. It is a very sophisticated High Voltage Shunt regulator PCB. I think it is an original Allen Wright's design. It can be use with an external power tube or as stand-alone. I made my own PCB using his schematic and parts list. I found the original documentation on the net, but it seems to be gone now. It took me some time to collect all the parts but I found them.

Been on the road again, I found some time to complete the PCB.

I'm planning to use it into my upcoming EAR824P Phono preamp clone.
I have two complete PCB completed. Just need to test it now.

Since it is not my design, and it is a brand new project I cannot answer any question on this circuit. I need to work on it first.

The manual
http://basenjes.de/tubes/data/sb/Shu...SB%20Notes.pdf

This is the top view.
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Old 16th September 2008, 11:32 PM   #2
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And the PCB bottom view.
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Old 16th September 2008, 11:39 PM   #3
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My own parts list.
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Old 16th September 2008, 11:44 PM   #4
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And my PCB parts silkscreen.
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Old 16th September 2008, 11:50 PM   #5
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what about the schematic?

TIA,
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Old 17th September 2008, 02:11 AM   #6
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I forgot ... Here it is.
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Old 17th September 2008, 09:42 AM   #7
Alex M is offline Alex M  United Kingdom
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Default Regulator

Just looking at the schematic, that's not Allen Wright's design - it is in fact Emile Sprenger's HPHV regulator, which is a very well-designed shunt regulator with a similar overall architecture to Allen's SuperReg. I use a couple in my RTP3C preamp, as well as in the active crossover I am in the middle of building right now.

Alex
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Old 17th September 2008, 03:19 PM   #8
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Thanks for the precision. I was looking for the original designer, but I couldn't find the original website.
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Old 18th September 2008, 06:52 AM   #9
pchw is offline pchw  United States
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Hi Alga_emi

The original manual says
DUE TO THE SPECIAL (DUAL) POWER PINS/CONNECTIONS OF THE OPA655P, DO NOT SUBSITITUTE THIS DEVICE WITH ANOTHER OPAMP.
Did you adjust the design for opa656u as in your BOM? I wanted to build this shunt regular for the longest time but had no chance to locate the ops655p.

Thanks!!
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Old 18th September 2008, 09:12 AM   #10
Alex M is offline Alex M  United Kingdom
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In my latest builds of the HPHV I used AD9631 instead of OPA655. These are high-performance op-amps with standard single power connections, and - more crucially - there is no facility for external compensatin or offset nulling, so pins 1 and 8 are not connected internally. I haven't tested my regulators with an oscilloscope, so I can't rule out ultrasonic problems, but they appear to be working fine.

Alex
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