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Develop ultra capacitor power supply and LiFePO4 battery power supply
Develop ultra capacitor power supply and LiFePO4 battery power supply
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Old 24th November 2020, 06:55 PM   #1361
stretchneck is offline stretchneck  United Kingdom
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Develop ultra capacitor power supply and LiFePO4 battery power supply
Thought it might be a heat issue - I only need 5v @ 1A... so it just depends on the thermal resistance of the heat sink. Would be good to know what it's specs are and feedback regarding the suitability of other components for the proposed 12v supply. I could always put a small fan onto the heatsink.

Last edited by stretchneck; 24th November 2020 at 07:05 PM.
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Old 25th November 2020, 04:43 AM   #1362
Greg Stewart is offline Greg Stewart  United States
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Develop ultra capacitor power supply and LiFePO4 battery power supply
@ Stretchneck,

I can offer another set of impressions powering an EtherRegen from a somewhat more exotic linear supply... 2 Uptone Audio LPS-1.2's set to 12V that are paralleled through a dual-section MPAudio.net 3||LT3045 10V board with the outputs of each section paralleled to provide about 2.2A output current capability at 10V. You can see my comments in the first post of this thread on Audiophile Style:

The EtherREGEN thread for various network, cable, power experiences and experiments - UpTone Audio (Sponsored) - Audiophile Style

Short answer, it is well worthwhile.

I am curious on your question... why do you want to power Ian's LinearPi from a 12V supply? While the LT3045 chips are ok up to 20V input, other parts on Ian's LinearPi may not be good to 12V. Is this to power an EtherRegen? The stock LinearPi is 3.3V or 5V output. The EtherRegen requires at least 7V minimum according to John Swenson.

While I can't answer for Ian on whether his LinearPi power supplies can be used with a 12V input and easily modified for a higher output, my experience swapping from the SMPS with the EtherRegen to my linear setup was VERY positive! AND a supply like Ian's LinearPi at 10V should provide a similar improvement.

IF you want to modify a LinearPi for use with a 12V input and 10V output (which should power an EtherRegen quite nicely), Ian will have to answer the following questions:

1. Will all components on the boards handle at least at 12V input (for a 10V output to the EtherRegen)?

2. Can the set-resistor be easily changed to set the 10V output voltage OR does it require removal of the heatsink.

3. AND of course, will the LinearPi be ok thermally with those input/output voltages and near 1A output current? I have used some of the MPAudio boards with 13V input for a 5V output, but the current out was less than 500mA in these situations.

BUT why 12V from an ATX supply? I would definitely use a linear transformer or supply to feed the LinearPi in an application to replace an SMPS.

My 2 cents!

Greg in Mississippi

P.S. AND @Supersurfer, I bet your setup is sublime and that the EtherRegen powered with the 2 5V UcConditioners in series to give 10V works VERY well. My UC-buffered supplies that I use on my DACs all still use DIY'd Point-to-Point UC pairs. I have on my list to make a 4-UC string to use at 10V in my EtherRegen power supply setup, but of course it won't be on a UcConditioner, so operation will be much more labor-intensive. I will report on sonics when I get to that.

BUT I can report that if you are just using 325F/350F UC pairs powering your USBBridge Signature, IF YOU CAN FIND THEM, you are in for a very nice surprise when you replace them with a 3000F Maxwell UC pair... using them took my setups to a new level. Sadly, Maxwell has discontinued units that large and they are getting extremely difficult to find. Does anyone have a good reputable source? I have some coming from a Chinese vendor on EBay, hoping they turn out to be good units and are as good as the ones I already have!
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Old 25th November 2020, 07:57 AM   #1363
stretchneck is offline stretchneck  United Kingdom
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Develop ultra capacitor power supply and LiFePO4 battery power supply
Thanks Greg - great feedback. By the way I'm Gavin1977 over on Audiophilestyle.

Nice alternative approach from Romaz over here as well:

A novel way to massively improve the SQ of computer audio streaming - Page 643 - Music Servers - Audiophile Style

I'm trying to power JCAT NET XE.

Anyhow, slightly off topic so I will say no more....
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Old 26th November 2020, 07:39 PM   #1364
Supersurfer is offline Supersurfer  Netherlands
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Hi Greg and Stretchneck,

My 10v linearpi and UcConditioner power supply for the Etherregen is an excellent solution, much better than the standard smps and another linear supply without ultracapacitors that I have used. I am quite sure it will not get much better than this on the Etherregen.

@Greg:
I also use UcConditioner with Allo Shanti on the usbridge sig. I have planned to switch the Shanti with a shunt regulator from Salas. Do you have experience with shunt regulators on Usbridge sig?

Regards,
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Old 29th November 2020, 03:47 AM   #1365
wirewiggler is offline wirewiggler  United States
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Just checking would there be any problem using the UcConditoioners or conditionerpi with the Salas L-adapter and Mesmerize power supplies?

Thanks
Bill
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Old 29th November 2020, 04:39 PM   #1366
igor04 is offline igor04
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Hello!
Please help me with the choice of transformer.
Is a 2x6v 25VA trafo suitable for linearpi + ucconditioner?
I'm going to use this setting to power the rpi + fifopi. 2A isn't too much for fifopi or will linearpi dump excess power?
Thanks.
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Old 29th November 2020, 07:16 PM   #1367
jean-paul is offline jean-paul  Netherlands
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Dump excess power!?

Instead of dumping names like fofipi we better speak in terms like power consumption (in the product of Volts and Ampères so VA). The rule of thumb is to choose VA rating twice as high as maximum power draw.
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Last edited by jean-paul; 29th November 2020 at 07:20 PM.
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Old 29th November 2020, 09:11 PM   #1368
Grarea is offline Grarea  United Kingdom
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Hi, could i please get some help working out why my Lifepo4 shuts down after a few seconds.
I am quite the noob to all of this I am afraid.
It is second hand and worked for a while then started to shut down and slowly got worse until it stopped working.
I changed a bulging cap and all was well for a while.
But it has started doing it again.
Is this the right place to ask?
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Old 2nd December 2020, 07:46 PM   #1369
Grarea is offline Grarea  United Kingdom
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I shall pop some of the details here, please let me know if it should be somewhere else.
I am firstly trying to check some of the numbers.

It powers up and starts charging. Seems to stay in that state indefinitely.
But when you switch it on, it shuts down within a few seconds.
Stating 'short protection' (which is one of the reasons I went this route )

I understand that it does that when:
"(2). If any output voltage at J1 or J2 is lower than 3.3V, the power supply will turn off automatically to prevent battery form over discharge."

When in charging mode it is stating 2.61v. I am pretty sure that number was 2.88v last week.
Shouldn't that read more than 3.3v?

When I go to start up, powering the fifopi, during the few seconds before it cuts out, the following readings are:
J8 5v non-isolated is 5.04

J1 0.00v
J2 2.57v

Well that is new.
J1 was showing a reading a couple of days ago.
Now, when switched off, if I am quick enough J1 shows a decreasing reading. I caught it at 0.2 and watched it drop to 0.1. It then didn't go up when i switched it on again.

Does that sound like a capacitor again?

If so, I assume something is causing that issue?
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Old 6th December 2020, 09:47 PM   #1370
Supersurfer is offline Supersurfer  Netherlands
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Default Nice boxed linearpi with UcConditioner

Hi,

I finally got around to building my linearpi and UcConditioner in a nice box.
It is currently switched as 10v output but can be split into 2x 5v. With an extra output connector.
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