Placid-BP Bipolar Shunt Regulated Power Supply

[BrianDonegan]

Yup. They are also LME49710, and pre-mounted. Time to update the description.

 

[Bassivus]

Yup. They are also LME49710, and pre-mounted. Time to update the description.

And single power placid uses 8pin DIP LME49710 now?

 

[BrianDonegan]

No, both single and bp use soic.

 

[Bassivus]

Ok thanks!

but since I have ordered PCB-s only I don't get them pre-mounted or do I?

 

[BrianDonegan]

but since I have ordered PCB-s only I don't get them pre-mounted or do I?

Nope, sorry.

 

[Bassivus]

No problem, I have a steady hand
Just wondering why you switched from opa227 to LME49710?

 

[BrianDonegan]

Both will work fine. The LME is lower noise and I had a ton of them on hand.

 

[LIVE_EVIL]

Sorry for stupid question, but can i drive Technics sl1200 from LCBPS (maybe parallel). Technics needs 21 volts inside and around 0.8A max. Or could placid do the job?

 

[pellesmil]

my 3 Placid BP came with VR1 and 2 at 20ohm , that is iaw the part-list, but not iaw schematics and setup procedure to set it at aprox 50 ohm before powering.

have i missed something here?

P

 

[Russ White]

We will need to update the manual. 20R is correct, just adjust it to the max resistance. remember that they have a tolerance, so if it tops out at say 18R or 22R its all fine.

 

[pellesmil]

We will need to update the manual. 20R is correct, just adjust it to the max resistance. remember that they have a tolerance, so if it tops out at say 18R or 22R its all fine.

Cheers

 

[BrianDonegan]

Schematic and Manual updated

 

[pellesmil]

Has the solder point on the print around the heat-sink studs any mission? i mean should the studs be soldered to that point?

I know that the the solder point could strain the transistor when temperature varies, but still.....

Or?

 

[Russ White]

I don't solder them personally. It makes it easier to replace things if you ever need too.

You of course can solder them if you like, and it will just make it a bit more mechanically solid at the expense of maintainability.

 

[labjr]

I noticed that some are using other regulators than the Placid for the Buffalo DAC. Is better performance attainable with other regulators? Will the Placid be improved upon or do you feel it's as good as it can be? What about using a higher quality bridge rectifier etc?

Thanks

 

[BrianDonegan]

I noticed that some are using other regulators than the Placid for the Buffalo DAC. Is better performance attainable with other regulators? Will the Placid be improved upon or do you feel it's as good as it can be? What about using a higher quality bridge rectifier etc?

Thanks

When using the Trident local shunt regulators, the BII's current draw is a little beyond the optimum current range of the Placid. It still works fine, it's just more current than it was designed for for lowest noise. Because of this, many use the LCDPS. When the Tridents are installed, the performance is really dictated by them.

Replacing the rectifier on the placid will yield a vanishingly small change, if any at all.

 

[labjr]

Thanks for your quick reply. I am considering building a Buffalo DAC and would want to make any worthwhile improvements I could the first time. It's hard to tell, just by reading forums, which changes will yield the largest improvement.

 

[MartinC700]

When using the Trident local shunt regulators, the BII's current draw is a little beyond the optimum current range of the Placid. It still works fine, it's just more current than it was designed for for lowest noise. Because of this, many use the LCDPS. When the Tridents are installed, the performance is really dictated by them.

Replacing the rectifier on the placid will yield a vanishingly small change, if any at all.

Brian,

Any recommendations on changes to the Placid to be better suited to the ~500mA current draw of the Buffalo + Trident set up?

Cheers

Martin

 

[BrianDonegan]

Brian,

Any recommendations on changes to the Placid to be better suited to the ~500mA current draw of the Buffalo + Trident set up?

Cheers

Martin

It actually works fine. It's not quite as quiet at that level (still very good), but it doesn't matter much as the Tridents are the "bringers of peace" locally on the DAC.

 

[MartinC700]

Thanks Brian, my Buffalo is now 'sealed' until you guys come up with your next wonder boards! - so that should give me at least a few months of uninterupted music listening.

Regards

Martin