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Old 13th January 2013, 01:39 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, 02:15 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, 03:50 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, 01:42 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, 02:27 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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