DIYINHK TPS7A47-Based Dual Power Supply
Just received the dual PS board from DIYINHK. It is based on the ultra low noise TPS7A47 regulator [link].
AC CAPABLE
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:
NOISE REDUCTION 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]
HEAT SINK INCLUDED
The board is rated at 1 amp with the included heat sink
GREAT DEAL
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.
H i F i D U I N O 
I think there is no problem to use one of the power supplies, with positive ground to have a supply + V, 0V,-V.
Thanks
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.
Salve.
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.
John
hello,
did you try yet the dual rail supply for audio with tps7a4700 ? i am interested too..
ciao
Enrico
Not yet… Soon.
I also got the new Isolated XMOS interface. Will try it with that device
Hi
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)
The capacitors are 40mm. You can mount then hotizontally if not using the heatsink.
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