I have been using LifePO4 batteries for my FIFO and DAC project for a long time. And also ultra capacitor power supply recently. I'm very happy with their performance and the sound quality.
http://www.diyaudio.com/forums/digi...mate-weapon-fight-jitter-353.html#post4239435
http://www.diyaudio.com/forums/pc-b...i2s-dac-hats-raspberry-pi-57.html#post5478596
Both ultra capacitor power supply and LiFePO4 power supply are passive power source. They are totally different to all kinds of regulators which are based on feedback. The most important thing is the perfect load response, much better than any regulator.
Both of them are ideal solution for DAC projects with amazing sound quality. Ulara capacitor power supply is a little bit better but the difference is minor. However the LiFePO4 power supply would be cheaper and easy to integrate into a all in one solution.
I'll work on both for sure. But I'd like to start from LifePO4 power supply.
LiFePO4PowerSupply_1 by Ian, on Flickr
Ian
http://www.diyaudio.com/forums/digi...mate-weapon-fight-jitter-353.html#post4239435
http://www.diyaudio.com/forums/pc-b...i2s-dac-hats-raspberry-pi-57.html#post5478596
Both ultra capacitor power supply and LiFePO4 power supply are passive power source. They are totally different to all kinds of regulators which are based on feedback. The most important thing is the perfect load response, much better than any regulator.
Both of them are ideal solution for DAC projects with amazing sound quality. Ulara capacitor power supply is a little bit better but the difference is minor. However the LiFePO4 power supply would be cheaper and easy to integrate into a all in one solution.
I'll work on both for sure. But I'd like to start from LifePO4 power supply.
LiFePO4PowerSupply_1 by Ian, on Flickr
Ian
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When power is turned on, all the output rails will be pure LifePo4 battery rail and will be also 100% isolated from each other. I don't want to do anything to degrade the quality of the battery power supply. When it's turned off, all batteries will be charged by a CC-CV charger automatically. The charging progress will be managed and with monitoring.
Regards,
Ian
Regards,
Ian
@ bvtrinh
The ultra capacitor power supply project has already been started for a while. The principle will be more complicated. For multiple power rails, the size will be bigger. And also, the overall cost will be higher. But anyway, it's coming.
Regards,
Ian
The ultra capacitor power supply project has already been started for a while. The principle will be more complicated. For multiple power rails, the size will be bigger. And also, the overall cost will be higher. But anyway, it's coming.
Regards,
Ian
Interested in the battery option with a positive and negative rails. Will there be a GB.
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@rayma
I have a LifePO4 battery cell which started 4 years ago, for my daily use, still powerful by now. It should have been recharged for more than 400 times if I do it every 3 days. I really love this battery. Much better than any other chemical.
BTW, specification says 1000 times.
Ian
I have a LifePO4 battery cell which started 4 years ago, for my daily use, still powerful by now. It should have been recharged for more than 400 times if I do it every 3 days. I really love this battery. Much better than any other chemical.
BTW, specification says 1000 times.
Ian
Some 25V Electrolytics and then polyprop close to the consumer circuit, this could work... I want to see measurements as well, maybe a shunt regulator could do the final dBs..
Rayma,
I've had the same experience as Ian over about the same period of time. I use two cells, one to recharge while the other is in place, so each has about half the use (until one of them, harboring an undisclosed suicide wish, became involved in a brief but spectacular welding incident).
George
I've had the same experience as Ian over about the same period of time. I use two cells, one to recharge while the other is in place, so each has about half the use (until one of them, harboring an undisclosed suicide wish, became involved in a brief but spectacular welding incident).
George
Would each power supply only be able to supply power to one location? Do we treat it like a regulator?
@wcwc
Try one rail for one location as possible as you can. However based on my real experience, one rail for multiple location would still be OK due to the very low internal impedance. Just trust your ears😀.
I do not suggest using and LDO or regulator after LifePO4 or ultra capacitor power supplies, that could degrade the power supply quality.
A lot of people use the small battery manage board for my FIFO project. It's OK, doesn't change the good sound quality, but just feels like a prototype. I'm gonna design a completed all in one solution this time, more closed to finished 😀.
Regards,
Ian
Try one rail for one location as possible as you can. However based on my real experience, one rail for multiple location would still be OK due to the very low internal impedance. Just trust your ears😀.
I do not suggest using and LDO or regulator after LifePO4 or ultra capacitor power supplies, that could degrade the power supply quality.
A lot of people use the small battery manage board for my FIFO project. It's OK, doesn't change the good sound quality, but just feels like a prototype. I'm gonna design a completed all in one solution this time, more closed to finished 😀.
Regards,
Ian
Hi Ian. How do you intend to do the switching between the ultracap banks? Relays?
Great projects as always, cannot wait 🙂
Great projects as always, cannot wait 🙂
@analog_sa
To switch between ultra capacitor banks, relays would have better isolation performance. However, they are a bit noisy, even to switch them every 5 to 10 minutes.
MOSFETs don't have this kind of problem, but they have small leak capacitance around tens of pF. This number could be still reduced by half if to switch both ground and power rail at same time.
MOSFET solution could also be complicated but more flexible.
It's really hard to decide🙂
Regrads,
Ian
