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Any status update of the Placid Power Supply?
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Russ, any update on your testing of the early Placid power supply board?
Thanks
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It is working fine. I have done one final tweak of the PCB and will have it ready to go in the next few weeks.
The circuit itself is working very very well and I have been running it for a few weeks in my office DAC. I am quite pleased with it.
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Russ,
Nice to hear that! Definitely waiting for its arrival.
Can you share the early board layout or the schematic?
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I know I'm stating the obvious here but, once you're done with moving and stuff, an update on Placid (ETA, board dimensions, performance measurements, listening impressions etc.) would be appreciated!  Keep up the good work!
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Hi Guys, Placid will have two forms: 1) "Placid BP" which is intended for bipolar supplies especially of the +/- 12-15V variety but not limited to those. That board is 3.5" x 3" 2) "Placid" which is a positive supply designed for 3-15V use but not limited to those. That board is 2.85" x 2.35". They are both equivalent ccts with the bipolar having a mirrored cct for negative supply. Both circuits are now tested, just awaiting the boards. Edited by user Sunday, August 16, 2009 8:02:55 PM(UTC)
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Great Russ! Thanks a lot!  You think one bipolar Placid will be enough for both IVY II channels? Edited by user Monday, August 17, 2009 1:00:13 AM(UTC)
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Hi Russ,
I have need for a bipolar +/- 24V supply at 500MA. Can a Placid with adequate heat sinking accommodate that need? The current is fairly static. If required, would there be the ability to parallel the pass transistors, say with hard wires and low value sharing resistors? I anticipate using a forced air cooled tunnel heatsink.
Thanks,
Tom
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Russ White wrote:1) "Placid BP" which is intended for bipolar supplies especially of the +/- 12-15V variety but not limited to those. That board is 3.5" x 3"
2) "Placid" which is a positive supply designed for 3-15V use but not limited to those. That board is 2.85" x 2.35". Bugger. I was hoping you could fit two positive supplies in the same footprint as the dual. Looks like I will stick with LCDPS for the digital side of things......
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C'mon guys, make it happen. I want to upgrade my Buffalo 32s :). I mean if the hardware was working fine already on April there has been plenty of time for tweaking. I understand you've been busy with other things, but that does not help me not getting excited about this product ;). Edited by user Saturday, September 12, 2009 3:36:06 AM(UTC)
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The boards are here and parts are on their way.
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what sound improvement can one expect if relacing the std buff 32 bipolar psu with placid?
best
Leif
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Cleaner, quieter, more dynamics (!).
We had a last minute part change (resistor) so I am waiting for the new ones to arrive. The kits are otherwise complete.
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will this be a plug´n play replacement if one has 2 bipolar psus with their repective dedicated 15v x-former?
best
Leif
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Well, build and plug and play :) Yes.
A note about transformers:
Because of the wide range of currents available from the Placid and the lower efficiency of a shunt (vs the linear LCxPS), we have changed the 15V+15V transformers we offer to 30VA from 15VA, but for out existing circuits, 15VA transformers will still be fine. Since we are limited in how many transformers we can stock, we decided to stock units that are more flexible. I have updated the transformers page with the new size/specs of the 30VA units.
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build; of course! that´s part of the charm  I´ve already used 30va x-formers based on previous experiences best Leif
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You guys are really going to like this. :) I have been listening to my Buf32S with two Placids, one for Buf32S VD, and one for the MUX I use for input. I also have two placid BPs one for each channel. I am not good at subjective speak, but its very nice. It is a step up in all the ways Brian described. Cheers! Russ Edited by user Friday, September 25, 2009 8:44:42 PM(UTC)
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Brian Donegan wrote:Well, build and plug and play :) Yes.
A note about transformers:
Because of the wide range of currents available from the Placid and the lower efficiency of a shunt (vs the linear LCxPS), we have changed the 15V+15V transformers we offer to 30VA from 15VA, but for out existing circuits, 15VA transformers will still be fine. Since we are limited in how many transformers we can stock, we decided to stock units that are more flexible. I have updated the transformers page with the new size/specs of the 30VA units. Let me get this straight. So, are the 15V+15V units different from what you offered before and the "single" version of Placid also work best with 30VA trafo (the LCDPS worked with 9V+9V)? I currently have one 9V+9V (for LCDPS) and one 15V+15V trafo (for LCBPS) - the ones you had before. Should I get 3 of those newer 30VA trafos to drive three placids (one single and two BPs, one for each channel) for max performance? Or should I get two of them newer 30VA trafos and use the old 15V+15V trafo for digital? Edited by user Saturday, September 26, 2009 7:19:31 AM(UTC)
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No, you will be fine with your current transformers. The Placid is just capable is drawing more current than the LCBPS, so we wanted to stock a transformer which will suit a wider range of applications. Put plainly, you can power both side of the Buffalo (analog) with one of the (old) 15VA 15V+15V transformers and one or two bipolar Placids.
If you are going to use two Placid BPs for dual mono, it would make sense to also use separate transformers. It is not required, but if you are going for optimum configuration, dual supplies and a single transformer is sort of going half way. Two transformers will get you galvanic isolation between the channels. That said, this is a smaller upgrade than just switching to the Placid from the LCBPS, which will be a more dramatic improvement.
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Any estimate on the dropout? Would 18V AC be better than 15V AC for the input or would it be just extra heat for no reason? Edited by user Saturday, September 26, 2009 12:11:23 PM(UTC)
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