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Old 13th January 2013, 02:39 PM   #61
feds27 is offline feds27  United States
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For those interested in building a Power Factor Conditioner like the Rowland PC-1, someone is selling used OPS-U500-385 modules on ebay.
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Old 13th January 2013, 03:15 PM   #62
feds27 is offline feds27  United States
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Quote:
Originally Posted by arthur View Post
my small AV amp progress:
Perfection! So how does she sound?
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Old 13th January 2013, 04:50 PM   #63
Pano is offline Pano  United States
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jalejos - Please do not insert very large file photos inline in your posts. I have resized and attached them.
Read this thread.
Pictures -- Why Not attach Them ??
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Old 2nd October 2013, 02:42 AM   #64
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To revive this thread again, I finally got a chance to examine a Ref1000MkII power supply closely.

It is a switchable rectifier voltage doubler circuit as I linked to above. Output to the IcePower module is 340VDC. It does seem to reduce the noise fed back into the AC lines a bit, but definitely does not eliminate it.

The additional components I could not identify appear to be related to inrush surge reduction.

I'll try to provide more details this weekend, but if one wanted to build the circuit linked above with appropriately-rated components, you'd be on the right track.

Greg in Mississippi
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Old 5th October 2013, 03:27 PM   #65
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First of all, anyone contemplating trying to duplicate the Bel Canto Ref1000 MkII Pre-SMPS linear supply needs to be aware of the dangers of working with a setup like this.

1. It is a power supply with no transformer. It has rectifiers directly connected to the AC line. It can kill you easily!

2. It has substantial energy storage. Even unplugged, it can kill you easily until the bleeder resistors bring the voltage down.

3. It is directly connected to the input of the B&O amp module. Connect it when it is not working right or connect it with the wrong polarity or connect it when it is not fully discharged or connect it with the voltage set wrong on the amp and you will have a smoking boat anchor.

Having said all that, due to concerns about liability, I have decided not to publish full details here.

Here is a bit more detail to what I had said in my previous posts. With this, a knowledgable DIY'er can duplicate this supply upgrade. What I said in Post #59 above is correct. The additions to the voltage doubler circuit from Wikipedia are:

- A transient surge suppressor across the output of the diode bridge

- An inrush current-limiting resistor at the input to the positive side of the capacitors

Greg in Mississippi

P.S. I assume that the bulk of the $1000/amp cost of the upgrade is in the metalwork. I just ordered all the parts I need to build these supplies for my 4 IcePower-based amps for about $130 USD. This does not include a circuit-board, I'll do it point-to-point, but still you should be able to add 4 boards and still keep it under $200!
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Old 2nd May 2014, 08:16 AM   #66
arky is offline arky  Russian Federation
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Quote:
Originally Posted by Greg Stewart View Post

3. It is directly connected to the input of the B&O amp module. Connect it when it is not working right or connect it with the wrong polarity or connect it when it is not fully discharged or connect it with the voltage set wrong on the amp and you will have a smoking boat anchor.
Hi. I was looking to attach 2x OPS-U-500-385 module to my pair of JRDG 201 amplifiers, thinking is just the same as Rowland PFC module, just without fancy machined housing. But was really concerned about your notice of polarity. I was under impression that switching supply of IcePower modules is irrelevant to polarity if powered with DC.
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Old 2nd May 2014, 09:25 AM   #67
Nisbeth is offline Nisbeth  Denmark
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The input of the ICEpower PSU contains a full-bridge rectifier (you can see the bridge on the board) so presumably polarity will not matter if you feed the board DC via the AC input?

/U.
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Old 2nd May 2014, 01:51 PM   #68
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I agree that polarity of connection SHOULD not matter due to the bridge rectifier input. Sorry for mis-stating this.

The connection used by Bel Canto on their pre-rectification upgrade has the positive connected to the pin closest to the center of the board, the negative to the pin in the middle of the power connector, and the ground to the pin on the outside edge of the board. You can see this in the pictures I posted above and the pictures from the reviews of the upgraded units.

I used this when I did my upgrade as I know it works.

I hope this helps!

Greg in Mississippi

P.S. Please let us know what differences the OPS modules make!
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Old 2nd May 2014, 04:54 PM   #69
arky is offline arky  Russian Federation
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Thanks folks! Once the modules arrive, I will post a report on connection and how they affect on sound.
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Old 12th June 2014, 04:27 PM   #70
arky is offline arky  Russian Federation
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Modules and case just arrived. Have put them together and checked - both modules working with about 375 volts output, without load. Now thinking how to deal with output connectors: have to be fool-proof hence Neutrick proprietary round powercons make sense, rather than just usual IEC outlet.

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