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In Reply to: RE: Regen makes Sense posted by fmak on November 18, 2015 at 04:29:30
I agree with your findings fmak. I know that UpTone is working on a new power supply for the REGEN that will be an upgrade (meaning not included with the REGEN).
Follow Ups:
I have since tried two different good 9v power supplies to the 7.5V TPS regulator ahead of the Regen, and they sound somewhat different!I have also powered the Zotac using a 19.5V high power (8A) 'super regulator', and this sounds better than the 10A lab supply I have been using.
Pity the not fully charged LIPO battery didn't last more than 6 hours. Will investigate.
Edits: 11/18/15
Try a LiFePo4 directly powering the Regen's USB hub chip & clock, bypassing the TI's reg - you will be amazed at the uplift in SQ. It's not a difficult or destructive modification.
Of course there is no 5V Vbus output so if your USB audio device needs this 5V power for sensing or powering, you will have to supply this in some alternative way.
You can also do what I have been doing for years on all my DAC's - using these batteries to power the DAC & trickle charging them while running. The quality of the connected charger is 99% immaterial - the battery acts as a very large bulk capacitor blocking 99% of PS noise from the 3.3V charging the battery.
If you are brave you can extend this idea to powering sections of your PC using this technique - the SQ gains are again substantial.
Look into TirnaHiFi forum where Nige2000 has taken this idea & run with it to great effect on his PC
Instinctively I don't like the risks and the limitations of using them. However, I do believe from experience that they can improve SQ as you said. Nowadays I prefer using very good superregulators that I don't need to switch off.
I have just bought a smart charger and an 'explosion' bag, plus a large 5200 mAH battery to see how long this will last.
LiFePO4s do not have the explosion/fire hazard risks of stock LiPOs, if this is what you mean?
They can also be continuously trickled charged even when playing so no need to turn off!
With LiFePOs, the capacity is more limited and one needs to parallel a number to get 5000 mAH or more.
What are the best LiFes available in your experience, and so you decouple them before and after?
They are very well suited to powering digital ICs which usually require 3.3V & 2300mAH is perfectly fine.
Yes, you can parallel them for higher current storage but a single battery has high current output - something like 60Amps continuous & 120Amps instantaneous output - treat them like car batteries - I've melted the tip of a screwdriver by accident with them & even jump started my car with 4 of them in series :)
A123 were the first to use the nano particle technology which confers such a high surface area to the cathode? (or anode, I never remember which) which accounts for the very low internal impedance & current capabilities. Other manufacturers now use this same technique.
I'm not sure what you mean by decouple them - before & after what?
Do uou bypass them with capacitors at the output? Like using a 0.01u npo plus larger values?
I only use local bypass caps at the pins of ICs - I found that the use of electro caps across battery poles (as most say are required) are detrimental to the SQ when used with these types of batteries
They can also be continuously trickled charged even when playing so no need to turn off!If you're continuously trickle charging the battery, aren't you defeating the purpose of using the battery to some extent in the first place? You now have a potentially noisy trickle charger on the circuit you're trying to supply with "clean power". Of course the battery is acting as a huge filter but since you've gone full circle by putting the battery concept back on the AC mains (thru the trickle charger), you may as well just build a good power supply and skip the battery idea. No? I'm not following the logic.
Edits: 11/21/15 11/21/15 11/21/15
Yes, it would seem to be counter-intuitive but by trickle charging the battery you prevent 99% of any noise from the mains getting through & still retain the SQ that you have if running solely from battery. Try it & see if you can hear any difference with/without charger connected!
With a decent regulated power supply similar to what you might have used without the battery.
The battery does act as a giant capacitor of almost unlimited capacity and a vanishing low ESR - using the A123 26650.
What ever you do... DON'T FORGET TO WEAR YOUR FORUM APPROVED BATTERY USING AUDIOPHILE PROTECTIVE SUIT!!!
Yes, Rick, I've been doing it this way for 4 years or more on my audio devices
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