Hi guy's,
I am about to convert an Pink Triangle Ordinal DAC to Lipo battery power supply , one battery for every section .
my questions are :
do I need anymore the filtering/smoothing and reservoir caps , having an almost perfect DC , so no AC to filter ?
what about the electrolytic bypass caps of the dac itself ( tda 1547 ) ?
what about the regulators noise , will it go any down ?
Thanks for your input 😉
.
I am about to convert an Pink Triangle Ordinal DAC to Lipo battery power supply , one battery for every section .
my questions are :
do I need anymore the filtering/smoothing and reservoir caps , having an almost perfect DC , so no AC to filter ?
what about the electrolytic bypass caps of the dac itself ( tda 1547 ) ?
what about the regulators noise , will it go any down ?
Thanks for your input 😉
.
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LIPO battery supply
I’m building a battery supply for my DaCapo but I’m using sealed lead acid (SLA) batteries instead of LIPO because they have less noise than other battery technologies. The 317 regulators used in the DaCapo aren’t the worlds best at rejecting noise - you may well have the same in your Ordinal.
You also need to check the battery voltages and switch a charger on (and maybe switch to mains power on the Ordinal) - I use an Arduino to monitor the voltages and switch the chargers on and display the charge state on an lcd graphical display (I can share the source code if you have any interest).
I’m building a battery supply for my DaCapo but I’m using sealed lead acid (SLA) batteries instead of LIPO because they have less noise than other battery technologies. The 317 regulators used in the DaCapo aren’t the worlds best at rejecting noise - you may well have the same in your Ordinal.
You also need to check the battery voltages and switch a charger on (and maybe switch to mains power on the Ordinal) - I use an Arduino to monitor the voltages and switch the chargers on and display the charge state on an lcd graphical display (I can share the source code if you have any interest).
Regulators require a large local capacitor for input bypassing for stability.
What kind of regulator do you have?
All the DAC bypass capacitors are still necessary, and noise is same.
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no harm to leave them there, one easy trick is to feed your battery into the reservoir caps directly
https://www.mikrocontroller.net/attachment/100819/Measurement_of_Chemical_Battery_noise.pdf
not exactly SLA vs LiXX, but the key is, the lower internal resistance the lower noise
not exactly SLA vs LiXX, but the key is, the lower internal resistance the lower noise
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Interesting but from 1995:
from
https://www.mikrocontroller.net/attachment/100819/Measurement_of_Chemical_Battery_noise.pdf
from
https://www.mikrocontroller.net/attachment/100819/Measurement_of_Chemical_Battery_noise.pdf
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Battery Noise
When you say "not exactly SLA vs LiXX" what we should really be saying is "no mention of either SLA or LiPo".
I do agree with your comment about low internal resistance being key though... which means that the battery AH rating comes into play. And then beyond that it becomes nonsensical with wiring playing a significant role in contributing to the overall noise figure and then you just get to the point where the noise is so close to the noise floor that you are struggling to measure it.
Suffice to say that whatever battery technology you are using it is likely to be an order of magnitude (or more) lower in noise that you are currently getting through the existing 317 regulators.
Another thing to consider is that LiPo cells do not like to be trickle charged and that is a fairly standard way of charging batteries in home audio equipment. Or maybe the OP will have a way of charging these cells correctly - difficult to know.
When you say "not exactly SLA vs LiXX" what we should really be saying is "no mention of either SLA or LiPo".
I do agree with your comment about low internal resistance being key though... which means that the battery AH rating comes into play. And then beyond that it becomes nonsensical with wiring playing a significant role in contributing to the overall noise figure and then you just get to the point where the noise is so close to the noise floor that you are struggling to measure it.
Suffice to say that whatever battery technology you are using it is likely to be an order of magnitude (or more) lower in noise that you are currently getting through the existing 317 regulators.
Another thing to consider is that LiPo cells do not like to be trickle charged and that is a fairly standard way of charging batteries in home audio equipment. Or maybe the OP will have a way of charging these cells correctly - difficult to know.
you will find it basically impossible to find a lead based battery with such low IR as those lithium based do, in fact lead cells are among the highest in terms of IR
also, the OP ask no question on charging so he should be fine
tips: get an IR meter which is very handy to check cell condition
also, the OP ask no question on charging so he should be fine
tips: get an IR meter which is very handy to check cell condition
The Lipo will be charged when the DAC is in off mode , nothing really tricky to charge them , trouble is life time , not more than 2 years I guess !!!!
I think it is worth the deal 😉 , compare to the actual poorly made power supply ....
the battery i choose has an internal resistance of 10 to 15 milliohms , nothing compare to lead/acid ones.
I made myself some measurement on them , the dc is almost clean .
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I think it is worth the deal 😉 , compare to the actual poorly made power supply ....
the battery i choose has an internal resistance of 10 to 15 milliohms , nothing compare to lead/acid ones.
I made myself some measurement on them , the dc is almost clean .
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Got the DAC today , the stuff is full of LM 317 / LM 337 , some are SOIC package .
on the analog stage they are all doubled , all are TO220 .
LT 1086 and LT 1033 will take place soon .
caps are chemi-con sme series , very low quality stuff !!!
trafos are really undersized !!!
First step : gonna take all the shitty stuff of the psu to the nearest trash !!!
for those who like upgrade i will post the all procedure .
what ever happens , the DAC sound nice as it is , pretty analog and detailed , as I like 😉
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on the analog stage they are all doubled , all are TO220 .
LT 1086 and LT 1033 will take place soon .
caps are chemi-con sme series , very low quality stuff !!!
trafos are really undersized !!!
First step : gonna take all the shitty stuff of the psu to the nearest trash !!!
for those who like upgrade i will post the all procedure .
what ever happens , the DAC sound nice as it is , pretty analog and detailed , as I like 😉
.
Transformers
After step one you won’t have much power supply left.
If you are going to throw out any of the transformers please consider user EXPOKEY5 - he has a failing transformer and might be interested in buying a replacement (see DaCapo thread).
After step one you won’t have much power supply left.
If you are going to throw out any of the transformers please consider user EXPOKEY5 - he has a failing transformer and might be interested in buying a replacement (see DaCapo thread).
indeed , that's the goal , i want to simplified and rationalized the all thing .
step two is :
no more main on the board .
lipo battery the close as possible to the new regulators with some 470 uf /16v Elna Silmics 2 if needed , nothing more .
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Here it is , many stuff is out of the board , Transformer are very difficult to desolder , i was not able to save any of them !!!
this DAC ha been thought very strangely , all the 0v digital and analog are common ,
even if they are all feeded with different trafos , Wastelake should have his own good reasons for that , but i do not get the point ??
here is the board now :
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this DAC ha been thought very strangely , all the 0v digital and analog are common ,
even if they are all feeded with different trafos , Wastelake should have his own good reasons for that , but i do not get the point ??
here is the board now :
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