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Linear Power Supply 6 years 2 months ago #20131

  • Kingpin
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Finished the miniDSP linear Battery Powered Power Supply (LiPo) based on the TPS7A4700 chip from Texas Instruments.
Voltage ripple is about 5µV (0 - 100kHz).

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Linear Power Supply 6 years 2 months ago #20235

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Very nice and thanks for sharing. Custom PCB design? DIP swtiches to configure some settings it seems.
Which miniDSP platform are you powering with this new PSU?
miniDSP, building a DSP community one board at a time.
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Linear Power Supply 6 years 2 months ago #20255

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Very nice and thanks for sharing. Custom PCB design? DIP swtiches to configure some settings it seems.

The design is based on the evaluation board of this chipset, documentation is very clear.
I just bought the board. The dip switches are used to set the correct output voltage, it's all handled in the TPS7A4700 chip !

Which miniDSP platform are you powering with this new PSU?

I'm powering the DDRC-22D. I know it has a switching regulator on it but it was worth to try it.
I also have a 12V version of it, but that's for a renderer and it's 230V version instead of battery powered.





Still in progress.
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Linear Power Supply 6 years 2 months ago #20290

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Here are the measurement results of the 220V power supply version (DCout: 12V/120mA):

0 - 20kHz measurement

ripple (2,4µVrms):


Noisefloor (-126dBV):


0 - 100kHz measurement

ripple (2,3µVrms):


noisefloor (-136dBV):

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Re:Linear Power Supply 6 years 2 months ago #20297

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Isn't the DDR all digital?

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Re:Linear Power Supply 6 years 2 months ago #20300

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Isn't the DDR all digital?

Yes.
The measurements shows the power Supply not the DDRC.

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Linear Power Supply 6 years 2 months ago #20338

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LiPo Power Supply Measurements

Ripple measurement (453,9 nVrms):


Noisefloor measurement (-137,4 dBV):

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Linear Power Supply 6 years 2 months ago #20409

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@Devteam: Can you publish the ripple and noisefloor of the supplied Power Supply Adapter which came with the DDRC series?

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Linear Power Supply 5 years 4 months ago #25225

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@Devteam: Can you publish the ripple and noisefloor of the supplied Power Supply Adapter which came with the DDRC series?

I would also like to see this :dry:

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Linear Power Supply 5 years 4 months ago #25231

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I doubt they would, because it's pointless. Firstly, they need to change the supplier as they see fit, they are not advertising some super low noise PSU provided. Secondly, all of these units have on-board regulators, some (like your DDRC-88A) have switching supplies to generate the negative rails for the output opamps anyway.

Why don't you just try the supply you posted about before and report if you can hear a difference?
I am not miniDSP support.

"You must ask the right questions." - Dr. Alfred Lanning's hologram.
-> Have you read the User Manual??
-> Have you drawn and posted a diagram?
-> Have you posted a screenshot?
-> Have you posted your config file?

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