Nelson Pass used the water analogy in the F5 amp manual. Great minds think alike.
LinearPi testing result
I did some test to LinearPi last weekend. I'm very happy with the load transient response response . This result is already very closed to a 26650 LifePO4 battery cell. The dynamic ESR looks even lower (around 1mV@500mA because of the feedback). And the transient time is also very short (good performance). Battery cell could have a little bit higher ESR (passive component no any feedback) but the transient waveform will be a little bit better for sure.
LinearPiLoadTransientResponse by Ian, on Flickr
LinearPi2 by Ian, on Flickr
Ian
I did some test to LinearPi last weekend. I'm very happy with the load transient response response . This result is already very closed to a 26650 LifePO4 battery cell. The dynamic ESR looks even lower (around 1mV@500mA because of the feedback). And the transient time is also very short (good performance). Battery cell could have a little bit higher ESR (passive component no any feedback) but the transient waveform will be a little bit better for sure.
LinearPiLoadTransientResponse by Ian, on Flickr
LinearPi2 by Ian, on Flickr
Ian
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You can do it with 4 LifePO4 cells and 4 UcHybrids, my LifePO4 PSU MKIII would be good option to go.
But I don't suggest you use UcConditioner in this way. Maybe I'll consider design a UcConditioner 12V later.
Regards,
Ian
Thanks M_Balou,
I don't have L-Adaoter but I have a Salas reflektor d. It has very good performance with the Kelvin sensing input (LinearPi too). Just bit less current.
Regards,
Ian
Thank! This is a great idea. I will wait. I am sure this will be a popular product.
oh, okay... sorry, my bad, i thought you had tried the L-adapter at some time.
and, yes the Reflektor-D is great, i have one powering my FioPi,
and, sure, it works with the UcConditioner, but its not ideal, because a shunt reg
don´t like high capacative loads, so i was in search of a more suitabe psu
for my UcConditioner + FifoPi and so the LinearPi is a no brainer for me
for that use-case.
on the other hand you can´t use a shunt reg for a raspberry, because of
the high current fluctuations.
i have a L-Adapter for my RPI and it works great, but i´m wondering if the
LinearPi would perform even better...
guess, i have to find out for myself...
(if you need a beta-tester, i´m available...
)could you tell us what load you use for your transient response tests?
@M_Balou
I like Salas's design. I believe UcConditioner can work with L-adapter very well. You can do some test now if you have my UcConditioner.
Or you can try both once LinearPi is available. Besides the low noise, high current and the good load response, LinearPi was designed having another feature which is the on/off management. With this feature, you can power the AC input all the time without shut down even LinearPi is turned off. All the capacitors will keep charged continuously for long term break in and best possible sound quality. Two or more LinearPi can also work together as a group under same on/off control (But still keep isolated between each other).
I designed the active load by my self with an ARM processor chip, low ESR MOSFETs, optical isolated drivers and power resistors. For best possible measurement, the active load was powered by a battery to eliminate the ground loop.
Regards,
Ian
I like Salas's design. I believe UcConditioner can work with L-adapter very well. You can do some test now if you have my UcConditioner.
Or you can try both once LinearPi is available. Besides the low noise, high current and the good load response, LinearPi was designed having another feature which is the on/off management. With this feature, you can power the AC input all the time without shut down even LinearPi is turned off. All the capacitors will keep charged continuously for long term break in and best possible sound quality. Two or more LinearPi can also work together as a group under same on/off control (But still keep isolated between each other).
I designed the active load by my self with an ARM processor chip, low ESR MOSFETs, optical isolated drivers and power resistors. For best possible measurement, the active load was powered by a battery to eliminate the ground loop.
Regards,
Ian
Hi Ian,
yes, this on/off managment is a nice feature, and UcConditioner and ConditionerPi have it, too.
you can to cool things with his, like actually powering off the whole Rpi-stack by doing
a software system shutdown.
hmm, so you build you own active load, cool, thats the spirit, why buy it, when you can build it yourself...
and good lab equipment is so damn expensive....
LinearPi mounted directly to a RaspberryPi
LinearPi was designed can be mounted directly to a RPi. If you prefer linear power supply for a RaspberryPi, LinearPi could be one of the best solution.
Besides the output terminal blocks, LinearPi also has output in a USB-Type C connector. More LinearPis can work together as group for more isolated 5V/3.3V voltage rails.
LinearPiRpi1 by Ian, on Flickr
Ian
LinearPi was designed can be mounted directly to a RPi. If you prefer linear power supply for a RaspberryPi, LinearPi could be one of the best solution.
Besides the output terminal blocks, LinearPi also has output in a USB-Type C connector. More LinearPis can work together as group for more isolated 5V/3.3V voltage rails.
LinearPiRpi1 by Ian, on Flickr
Ian
LinearPi upgrades to an ultra capacitor power supply
LinearPi can be upgraded to an ultra capacitor power supply by integrating with either UcConditioner or ConditionerPi.
ConditionerPi can be installed as part of the RPi stack and to power RPi directly to the local GPIO. But UcConditioner can have bigger ultra capacitors.
LinearPiRpi5 by Ian, on Flickr
Ian
LinearPi can be upgraded to an ultra capacitor power supply by integrating with either UcConditioner or ConditionerPi.
ConditionerPi can be installed as part of the RPi stack and to power RPi directly to the local GPIO. But UcConditioner can have bigger ultra capacitors.
LinearPiRpi5 by Ian, on Flickr
Ian
I also received the module, the board is really beautiful. I carefully compared 3.3V and 5V of UcConditioner, and I found that the components are actually the same, but the specifications of components are different. In other words, in terms of cost, the 3.3V and 5V are actually the same, but the price is much worse. I attach these different components.
You've got a lot of time on your hands! Good insight.
I like the questions you raise, but your means seems passive-aggressive and statements verge on exaggerated. Although I'm sure not intended in that way.
I'd suggest this is a bit harsh to post this, without asking Ian privately as to why there is a difference, as there could be many reasons. As I'm sure you will understand building products is never a linear business model. It could be simply to do with the volumes he has ordered for specific parts as he expects the 3.3v to sell less or part shortage of the pandemic etc.
Keep asking the right questions, but it would be nice if it could be in a constructive way and give Ian the opportunity to answer privately for anything that could be controversial
Hi Yunyun,
Your UcConditioner 3.3V is the very early version with some manual assembling job involved. Finial released version is different in better performance. I can replace it for you if you want. Please let me know.
Regards,
Ian
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