Home > POWER > DIYINHK TPS7A47-Based Dual Power Supply

DIYINHK TPS7A47-Based Dual Power Supply

December 19, 2013 Leave a comment Go to comments

Just received the dual PS board from DIYINHK. It is based on the ultra low noise TPS7A47 regulator [link].








The implementation is an improvement over the TI evaluation board [link]. Comparing it with the TI board, one can see that it has a AC/DC rectification section enabling the board to take AC input. The board also keeps all the jumper settings to adjust the output voltage.


Here is a photo of the included smoothing capacitor:



This is an improvement over the evaluation board. The included capacitor is a film-type capacitor allowing better noise performance. Some experiments at diyaudio have shown positive results [link]



The board is rated at 1 amp with the included heat sink



This dual PS board costs $50 or $25 per channel. Compared with the TI evaluation board which can be purchased for $20 (itself a great deal) you get AC/DC rectification, improved noise reduction filtering, heat sink for higher power capability and installation hardware. This makes it an even better deal that the TI evaluation board.

  1. December 21, 2013 at 10:34

    I think there is no problem to use one of the power supplies, with positive ground to have a supply + V, 0V,-V.

    • Oliver
      December 22, 2013 at 22:20

      Did you try it ?
      I was thinking about the same, but ended up with conluding that it is impossible to get negative voltage regulation from a positive voltage regulator.

      If you think about positive ground, like connecting GND, +9V, +18V as -9V, GND, +9V – that might be possible in a pure virtual GND arrangement circuits. But in Audio world, I am interconnecting devices through Cinch or Balanced (XLR) cables. As a result GND is always referenced against ot equal to EARTH.

      Therefore I think in Audio applications it is not possible to use this as bi-polar ( + / – ) supply.

  2. December 23, 2013 at 18:14

    No, I have not tried it but I hope to do so as soon as I arrive.
    If we let the floating input of the regulator for the negative polarity (not referred to ground) and the positive output of the regulator to the ground, it should work, I guess.

    • EnricoB
      January 24, 2014 at 00:51


      did you try yet the dual rail supply for audio with tps7a4700 ? i am interested too..


      • BlgGear
        January 24, 2014 at 16:36

        Not yet… Soon.
        I also got the new Isolated XMOS interface. Will try it with that device

  3. Thomas Kilvaer
    February 16, 2015 at 16:24

    Do you know how tall this psu is? In your opinion: is it possible to mount the smoothing caps in a horizontal position (bending the legs)

    • BlgGear
      February 17, 2015 at 06:39

      The capacitors are 40mm. You can mount then hotizontally if not using the heatsink.

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