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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 4th July 2020, 10:18 PM   #1141
Arunas B is offline Arunas B  Lithuania
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For the fifo pi clean side use universlal 3.3v conditioner by bypasing On board 5v to 3.3v regulator.
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Old 4th July 2020, 10:28 PM   #1142
NicMac is offline NicMac  Italy
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Develop ultra capacitor power supply and LiFePO4 battery power supply
Quote:
Originally Posted by Arunas B View Post
For the fifo pi clean side use universlal 3.3v conditioner by bypasing On board 5v to 3.3v regulator.
For the clean side of FifoPi I am thinking to use a ConditionerPi (or UcConditioner5V) to "pre-buffer" separate local 3V3 regs (x4) on FifoPi (x1 for XO) and DAC HAT (x3).
I prefer local separate regulation so a 3V3 conditioner is not useful to my purpose.
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Old 4th July 2020, 10:42 PM   #1143
iancanada is offline iancanada  Canada
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Develop ultra capacitor power supply and LiFePO4 battery power supply
@NicMac

As I understand it the UcConditioner has the advantage of larger capacitance, while the ConditionerPi has the advantage of being closer to the load (part of the stack).

Yes, Correct!

Could a second ConditionerPi be used to buffer the 5V rail for the clean side of FifoPi and DAC HAT?

It's good to use ConditionerPi to power a RPi through GPIO.
But for FifoPi clean side, I suggest use an UcConditioner


Ian
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Old 6th July 2020, 12:17 PM   #1144
laserscrape is offline laserscrape
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As AKM DAC user, what is the ideal way to use LiFePo for 5V? Are we stucking using a regulator?

I am considering using NiCd cells, at 1.2V each this can get within the recommended supply range of 4.8V.
Thankfully NiCd seem to be some of the better performing cells after Lithium, not the ultimate battery supply but supplemented with a range of caps from ucaps to small film caps it should be be pretty close .

Last edited by laserscrape; 6th July 2020 at 12:24 PM.
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Old 8th July 2020, 01:51 AM   #1145
iancanada is offline iancanada  Canada
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Develop ultra capacitor power supply and LiFePO4 battery power supply
Default LinearPi 5V/3.3V 2A 0.8uV ultra-low noise PSU

Design ideas:

1. Linear full SMT 0.8uV Ultra-low noise blade powre supply
2. 5V/3.3V 2A heavy duty high current design
3. High speed soft recovery Schottky Rectifiers with option shunt cpapcitors
4. Seamless upgrading with UcConditioner for ultra capacitor power supply
5. Bult-in on/off control logic with on-board or external power switch
6. More LinearPis can work together as group with isolated master/slave control chain
7. Optional Kelvin sense input for better possible performance
8. 2oz double thickness pcb copper layer for lower ESR
9. 6V AC or 7-9V DC power input
10. Great to work with Raspberry audio application or other DAC

Click the image to open in full size.
LinearPi1
by Ian, on Flickr

More LinearPis can be easily integrated together with master/slave on/off control
Click the image to open in full size.
LinearPi3
by Ian, on Flickr

Upgrade with UcConditioner seamlessly
Click the image to open in full size.
LinearPi4
by Ian, on Flickr

Ian

Last edited by iancanada; 8th July 2020 at 01:57 AM.
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Old 8th July 2020, 04:48 AM   #1146
yunyun is offline yunyun
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LinearPi is based on 4 parallel LT3045, like this one below? The price should not exceed 25USD.

O1CN01jWkwIW1gwqpKUrOIm_!!4129314207.jpg
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Old 8th July 2020, 05:00 AM   #1147
iancanada is offline iancanada  Canada
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@yunyun

You didn't really get the design idea of my LinearPi.
Why I waste my time designing a PSU if I'm happy with a $25 LDO board ?

Ian
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Old 8th July 2020, 05:05 AM   #1148
yunyun is offline yunyun
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@Ian,

You misunderstand me. I mean if LinearPi is based on 4 parallel LT3045, don't sell more than 25USD. I believe LinearPi's design will be better, but the details are not mentioned in your introduction, making it difficult for members to judge. I would hesitate to buy LinearPi because the details are unknown. The noise of LT3045 is 0.8uV at 500mA, and the current of LinearPi is 2A, so I guess it is based on 4 parallel LT3045.

Last edited by yunyun; 8th July 2020 at 05:09 AM.
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Old 8th July 2020, 10:45 AM   #1149
Studley is offline Studley  United Kingdom
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Default LinearPi

Ian
If you are going use the UC Conditioner is there any advantage in using an even less noisy linear PS than the LinearPi? (Not sure what that would be) Or is the LinearPi already quiet enough to maximise the potential of the UC Conditioner?

Last edited by Studley; 8th July 2020 at 10:52 AM.
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Old 8th July 2020, 10:53 AM   #1150
yunyun is offline yunyun
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@Studley,

Since the current of the audio device is provided by ultra capacitor, not the current provided by the charging device in front-end, no matter whether it is a battery, a bad LDO board or a great LDO board, in theory, there will be no difference between them. Don’t forget that ultra capacitor with huge capacitance has excellent filtering ability, and the noise of the charging device is unlikely to cause negative effects.

The capacitor was originally used for filtering, but the capacitance of the electrolytic capacitor is much less than ultra capacitor, which makes us no feel that the capacitor can make us ignore the difference in the front-end charging device. However, now that we have all used ultra capacitors, the front-end devices need not be too concerned.

Last edited by yunyun; 8th July 2020 at 10:58 AM.
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