![Image](http://cdn.shopify.com/s/files/1/0660/6121/products/UpTone_REGEN_PCB1.1_for_web_1024x1024.jpg)
I was asked on the Audioasylum (correctly named, btw) forum to give instructions for this tweak to the Regen so I should also post it here.
This is not another PS to plug into the DC input of the Regen - it's a bypass of the 3.3V on-board regulator with a 3.3V LiFePo4 battery supply. I know the regulators are said to be SOA but a LiFePO4 battery easily beats them in this application. This battery tweak significantly improves the sonics from the already good sounding Regen & is easy & reversible modification.
So for anybody wishing to try it, you need to open up the Regen to connect a battery to the output from the 3.3V regulator & ground, thus bypassing the regulator. There is a ceramic capacitor C3 right at the output of that regulator - the reg at the top of the pic - REG33.
There's a copper via with a 5 beside it at top of that C3 capacitor - this is the GROUND point for connection. The other side of the capacitor is the connection to 3.3V positive (the one with two vias side-by-side). You need to attach the battery + & - poles to these points - soldering to these vias is best. It's very easy to reverse this if desired.
This only powers the USB hub chip & the clock which is all that's needed for audio devices that don't require the USB Vbus 5V power for the audio device. If your USB audio device does require the 5V supply you can do this using a modified USB adapter which has been modified to accept an external 5V PS - something like you see on the Aqvox site
BTW, I tried 2 of these LiFePO4 batteries to power the Regen through its DC input & this direct 3.3V power from one battery directly to the injection points on the Regens pcb, provides a far superior sound, so it's not just the batteries that make the difference but bypassing the REG33 which also matters.
Try it & post your reports
I am also reminded to warn people that they do this at their own risk & that they should use some common sense when doing this (although it's very simple). These batteries can put out a lot of power - treat them with respect - as you would a car battery - they are that powerful!!