Hello,
What are we waiting from a good power supply for audio ?
I assume, filtering from the main, low impedancewith flatish waide bandwith, low inductance.
What are the poor and cons of such super cells VS super caps ? What I see is a lythic is better ESR and Tang loss than Super caps. Batteries A123 LIFEPO didn't convinced me on a Masterclok.
Nowadays it seems people like Farad supercells to filter the main and the reg before are just to charge them and permit isolation from the main and near constant DC, so reduced ground loop (the loop is between the load and te cap, not the power traffo starground)
Do I understand correctly ?
It is difficult to see what is good enough for audio among the Super ref à la WJ, The super cells double layer caps (100 mHonks at best), the Super cells (inductancee ? bigger ground loop ?).
Here Thorsten Loesch propposed a constant super caps bank for a dac, Farad are huge so serie connection to acheive the good voltage needed is feasible but what about the ESR at the end. Of course I surmise the quality of the main and EMC is totally rulled with such layout ! But does it sstill work if one put a lower tang/loss or lower ESR cap after the bank between the load ?
Me I have stil 3 A123 cells that doersn't serve after few experiments !
What are we waiting from a good power supply for audio ?
I assume, filtering from the main, low impedancewith flatish waide bandwith, low inductance.
What are the poor and cons of such super cells VS super caps ? What I see is a lythic is better ESR and Tang loss than Super caps. Batteries A123 LIFEPO didn't convinced me on a Masterclok.
Nowadays it seems people like Farad supercells to filter the main and the reg before are just to charge them and permit isolation from the main and near constant DC, so reduced ground loop (the loop is between the load and te cap, not the power traffo starground)
Do I understand correctly ?
It is difficult to see what is good enough for audio among the Super ref à la WJ, The super cells double layer caps (100 mHonks at best), the Super cells (inductancee ? bigger ground loop ?).
Here Thorsten Loesch propposed a constant super caps bank for a dac, Farad are huge so serie connection to acheive the good voltage needed is feasible but what about the ESR at the end. Of course I surmise the quality of the main and EMC is totally rulled with such layout ! But does it sstill work if one put a lower tang/loss or lower ESR cap after the bank between the load ?
Me I have stil 3 A123 cells that doersn't serve after few experiments !
why you think you dont like the A123?
- Does a supercap improve things? or a electrolhytic capacitor bank in between? which should improve "source" ESR
- is it the non constant voltage ?
- noise shouldnt be a concen here or? (tho i havent tried/measured ian canadas battery supplys)
is there really much else to it?
With the modified design, the impedance goes even lower😉.
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Hi,
I have a GainWire preamplifier and I thought that it would be powered by LiFePO4 batteries (26650 A123), 2pcs (+/- 16V) 5s1p (5 series A123).
I would also like to reduce the output resistance so I would install 10-10 more 680uF high current low ESR capacitors ( Panasonic EEH-AZSV681UB) in the output.
Anyone has experience with battery powering a preamp?
I have more Salas UBiB 1.3 PSU, but I don't which is better?
Thank you
I have a GainWire preamplifier and I thought that it would be powered by LiFePO4 batteries (26650 A123), 2pcs (+/- 16V) 5s1p (5 series A123).
I would also like to reduce the output resistance so I would install 10-10 more 680uF high current low ESR capacitors ( Panasonic EEH-AZSV681UB) in the output.
Anyone has experience with battery powering a preamp?
I have more Salas UBiB 1.3 PSU, but I don't which is better?
Thank you
ok low impedance is good, but what does it mean to the output noise? it does not fix the noise of the internal reference right?
noise relates to the Vref noise, the error amplifier's implicit noise and amplification factor.
It's a battery thread, let's stick to the topic.
It's a battery thread, let's stick to the topic.
sure thats the point and now clear, and i think this thread is more concerned on noise
i asked because im not sure why you guys suddenly come up with super regs impedance for no reason
i asked because im not sure why you guys suddenly come up with super regs impedance for no reason
Sorry I thought the LiFePO4 vs Salas power supply choice was partially relevant to the topic of this thread. I don't know which would be the relevant topic.
I cannot delete my post.
I cannot delete my post.
use batteries for sure, whenever possible, unless there is any new innovation in power supply technologies
@topicreader : Hi .. I will take the liberty to just briefly give you a partial reply to your question - as well as I can ...
I hope this helps,
Jesper
- As I mentioned earlier using Lithium batteries in series requires some kind of balancing so that the batteries charge, and continue to charge, to identical voltages. In my experience (based on Li-ion batteries, appr. 2000 mAH capacity) the imbalancing current is not higher than ~5 mA so the batteries do not imbalance with very high currents. If a resistor balancing is used I personally would use an appr. 1k resistor across a Li-ion battery of 2000 mAH capacity.
- If the batteries are not constantly float charged when used for playback I have observed that they tend to lose some dynamics if the discharge current gets beyond some level. Personally, I would not discharge a 2000 mAH battery with a higher current than, say, 50 mA. If higher discharge currents are needed the cells may be paralleled or a higher battery capacity may be used.
- Regarding a comparison of merits between Salas' PSU and batteries I cannot reply to this as I have never used this regulator. However, in my general experience I have never heard a wall-supplied PSU provide the space, overview, silence, instrument definition, and overall "surplus" that batteries (used feasibly) may provide.
I hope this helps,
Jesper
Hi again,
In hindsight I would like to add a follow-up to my post above i.e. #132.
Thinking about it I personally would not use a passive balancing circuitry as I consider a high level of safety desirable/necessary particularly with Li-ion batteries. Thus a suitably dimensioned active balancing circuitry would be my choice.
Cheers, Jesper
In hindsight I would like to add a follow-up to my post above i.e. #132.
Thinking about it I personally would not use a passive balancing circuitry as I consider a high level of safety desirable/necessary particularly with Li-ion batteries. Thus a suitably dimensioned active balancing circuitry would be my choice.
Cheers, Jesper
so you are trying to say that super regs are better than batteries because the output impedance is better, again, but arent we talking about noise?
With shunt regulators like Salas' UBiB, we have only 420 nV total noise in the 20Hz-20Khz bandwidth. Measured, no simulation phantasy involved.
https://www.diyaudio.com/community/...-ultrabib-shunt-regulator.322411/post-7391190
With Jung-Didden super-regulator and adequate opamp choice, we have just a little more.
https://www.diyaudio.com/community/threads/super-regulator.247281/post-7263619
There aren’t many audio applications, voltage references excluded, where those noise level are not adequate.
no doubt, 420nV is impressive, much more than adequate (for most people), and possibly very close to the technological limit
but clearly we are looking for the best at our disposal, i have yet to see guys working with low noise amplifiers used super regs for their tasks instead of batteries, any?!
but clearly we are looking for the best at our disposal, i have yet to see guys working with low noise amplifiers used super regs for their tasks instead of batteries, any?!
I have powered Groner's 400pV/RtHz amplifier from Linear Audio with alkalines, super-reg and silent switcher and the baseline noise remains unchanged. With the Pearl 2, same result (Pearl 2 uses 24V regulators which I disabled).
With short leads the "mains hump" largely disappears with batteries.
With short leads the "mains hump" largely disappears with batteries.
alkalines are way higher resistance say 100milliohms or more, but you dont even beat that crap? and you dont solve the mains hump problem with super regs?