Develop ultra capacitor power supply and LiFePO4 battery power supply

Hello,
Just recently i wrote about possible use of supercaps in a '' Le monstre '' power amplifier which started with a big mains power supply and where some people ended up using a set of 12 volt 45AH car batteries ( in 1985) . Back then using one supply would allow you to listen about 3 hours before recharging again.
Of course a supercap is not a battery but they could be used. I just mentioned Iancanada so people will have to google and decide themselves if the want to try it.
Of course only if Ian still offers support.
Greetings, Eduard
 
Hi,

I tested building bipolar -/+5V supply out of ultracaps for R2R dacs. It works great.
Is it possible to make bipolar supply -/+5V out of two ucpures? My main concern is possibly messing up with charging circuit ...

Greetings,
Mirek
This is possible as long as you use two independent power supplies on two independent secondary windings on your transformer to charge the two UC pures or UC conditioners.
You can stack both 5v supplies and connect the ground in the middle.
 
This is possible as long as you use two independent power supplies on two independent secondary windings on your transformer to charge the two UC pures or UC conditioners.
You can stack both 5v supplies and connect the ground in the middle.
Thank you supersurfer,
Now I think about possible voltage inbalance between -5V and +5V due to slight different power consumption on each rail over long time. It may eventually happen that -V is < V+ or the other way. The maximum difference will depand on fixed voltage threshold set in ucpure. Do you know at what voltage level ucpure starts and stops charging? Another thing is implications of such difference on R2R performance. I cannot find information in datasheet on what value (voltage differrence between -V and +V) is tolerable ...
 
Thank you supersurfer,
Now I think about possible voltage inbalance between -5V and +5V due to slight different power consumption on each rail over long time. It may eventually happen that -V is < V+ or the other way. The maximum difference will depand on fixed voltage threshold set in ucpure. Do you know at what voltage level ucpure starts and stops charging? Another thing is implications of such difference on R2R performance. I cannot find information in datasheet on what value (voltage differrence between -V and +V) is tolerable ...
I wouldn’t worry about this. The ucpure is simply a capacitor bank, the power supply regulator that you put in front will regulate to the needs of the r2r As long as it’s power demand is sufficient.
 
I wouldn’t worry about this. The ucpure is simply a capacitor bank, the power supply regulator that you put in front will regulate to the needs of the r2r As long as it’s power demand is sufficient.
The thing is I do not want to have any regulators :) I want to power it directly from ultracaps. That is what I already do for other 3.3V and 5V circuits.
 
HI!
I'm going to buy a good power source for my rpi4 and a little confused because of many options with latest novelties. What is the best option for raspberry - ucpure or purepi? purepi has separate 5v/3.3v rails, but ucpure has much bigger supercaps capacitance and is completely isolated from the charger. What is the ultimate option from these two?
And one more: is it possible to order Ian' products from him directly?
 
HI!
I'm going to buy a good power source for my rpi4 and a little confused because of many options with latest novelties. What is the best option for raspberry - ucpure or purepi? purepi has separate 5v/3.3v rails, but ucpure has much bigger supercaps capacitance and is completely isolated from the charger. What is the ultimate option from these two?
And one more: is it possible to order Ian' products from him directly?
Uc Pure is better but a bit more complex and bulky to get 5 an 3.3 v you will need 2 Uc pures and 4 very Large ultracaps and 2 (12-18v) power supplies so it is up to you.
You will need to understand the dangers of working with such large ultracaps and be comfortable with that.
Purepi is a simple easy solution in a compact size.
you can order directly from Ian from Github, download the order form and email it to him
https://github.com/iancanada/DocumentDownload.

-------------------------------------
See my Youtube Chanel :hphones:
 
Uc Pure is better but a bit more complex and bulky to get 5 an 3.3 v you will need 2 Uc pures and 4 very Large ultracaps and 2 (12-18v) power supplies so it is up to you.
You will need to understand the dangers of working with such large ultracaps and be comfortable with that.
Purepi is a simple easy solution in a compact size.
you can order directly from Ian from Github, download the order form and email it to him
https://github.com/iancanada/DocumentDownload.

-------------------------------------
See my Youtube Chanel :hphones:

Thank you Gabster 2000!
For unknown reasons I thought PurePi will feed raspberry with 5v and 3.3 separately, but it won't. Maybe because there were mentions in description of 5v and 3.3v and many pins on it.
But after reading datasheet I realize it gives to the raspberry only 5v from supercaps but 3.3v from batteries is dedicated to another devices. In this situation, UcPure is obviously the choice.

But there is one moment I don't quite understand - if i will have two UcPure's 5v and 3.3v - is it enough just to connect them to GPIO pins for separate power supply?
Ex. 5v to 2, 4, 6 pins and 3.3v to 1, 9 pins?
Will the raspberry take 3.3v from pins or from an internal converter?

I have ordered one UcPure 5v and supercaps for now, if I will survive after assembling first unit and be able to figure out how to connect another one then I will order 3.3v)
 
  • Like
Reactions: 1 user
Hats off to @iancanada for the UcPure boards - thank you very much.
I've just constructed my first one and apart from completely ignoring the size of the UCs during the purchase (they are BIG) and the fact that one of my kids asked me if I was building a bomb...all is looking good ;-)

I've built 15v one so far, to power Andrea's clocks. See attached pics. I got slightly worried as the 'full' LED came on but the charge went past 15v without stopping(!) but it's levelled out at 15.5v and is now constant.

Once I've got this one installed I've got 2 more. One is going to power the SinePI once I get it working properly in my setup.

Here are some pics of the test build and I will report back when I'm powering something I can listen to!

View attachment 1007398 View attachment 1007399 View attachment 1007401

Thanks again Ian,
Crom
Hi Crom, As I am playing with PSU as well for Andreas Clocks now...what was your listening impression in the end ?
 
Hi gents.
I'm thinking of getting a pair of UCConditioner.
I'd like to know the influence of the power supply before the ultracaps.
Is it mandatory to have a top-notch regulated PSU with high current capacity, or any linear PSU will do nicely, the ultracaps taking care of the ripple (and noise?)?
 
Sorry @clsidxxl and @Blitz, life getting in the way of this hobby :)

OK, so I have previously built power supplies using Ian's UCPure boards and have installed these in various places in DAC, fifo, clock power and streamer. My decision to do this has been based on years of fiddling with linear supplies > lead acid batteries, > lithium, > lifepo4's, etc etc and each time noticing an uptick. Low noise, ESR and great transient response #849 is I guess the reason for the uptick. I think maybe that given the expense and the size of the latest UC psu my expectation was perhaps skewed - I perhaps expected more. My impression was not to be 'wowed' in the way that I have been previously. Nevertheless, the UC ps was an improvement on the linear supply that I tested the clocks with initially and has remained powering Andrea's clocks and overall the clocks now for 6 months. Possible mitigating factors in my experiment are that I need to put the psu in a box but until I find something suitable it must live in a 'safe' place which means a 3m cable between the power supply and the clocks. I will report back when I change this. Can anyone recommend a box for such a creation???

Overall, Andrea's clocks combined with the UCPure supply are the best clocks I have ever heard. In my opinion they beat crystek, tent labs, neutron star, pulsar, and many more that I have tried over the years.

In other news, I have never managed to get SinePI to work. Ian has helped me a little but I think there was some incompatibility between sine-pi and the slightly older clock board I was using. It is quite telling that I haven't built the second 'bomb' I think. Anyway, I sadly gave up with it (I used to have endless time for this hobby, now with a family I need to snatch a few hours every now and again and make sure the system works at the end of it - other wise I get complaints!!)

I do not like to appear negative and please don't take the post in such a way...this currently solution is still the best I have heard in my system. I will report back once I have spent some time optimising. I am also preparing to try Andrea's fifo board and then DAC following @Sligolad 's positive report. for ease/speed, I have opted for the lifepo-based supply which I will then tweak with UC.

@clsidxxl the yellow UC's are Eatons.
 
Thanks a lot for the feedback...may I ask is there a recommendation for a smaller version based on UC? Maybe not on 3000F basis ? Maybe more like the smaller UC solutions where the UC is not like a battery but more like the last PSU cap ?

Or in other words: Whats is above Lifepo4 and not so damned expensive to get a taste of what UC does before going for the big solution ? I understodd that UCpure board needs those big 3000F versions...otherwise I would have simply taken a smaller UC version maybe...
 
PurePi switch S1 - on the board S1 is labelled as "Short S1 to BYPASS F2" by which I assume it means the fuse. S2 however appears to be the On/Off switch. It is not clear from the instructions whether I am to connect a switch to the S1 pads.
I have rechecked the documents in github and they were updated only a few weeks ago, the jpeg image agrees with the board showing S2 as On/Off but the PurePiManual and this thread only mention S1 as the on/off.
 
Member
Joined 2003
Paid Member
Alan, so good to see you here as always, been too long! Hoping you & yours are well!

Ian is on vacay for a couple weeks. While I don't have a PurePi, I know his gear well enough to answer...

You are correct, S2 is the On/off switch. J5 is where you can connect an external switch either using a mating plug or the solder pads on either side of the socket.

His references to S1 in step 6, 7, & 10 of the "Getting Started" section should read S2.

S1 & S3 are where you solder a link to bypass the adjacent fuses for possibly better sound, but some risk.

J9 provides an On/Off signal to control other boards that can use this signal.

S4 (on the bottom of the board) set to "On" let's you use the PurePi without batteries installed.

This should help!

Later!

Greg in Mississippi