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Old 10th August 2013, 11:51 AM   #2951
qusp is offline qusp  Australia
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yep, well we have orders of magnitude higher radiated noise here. thanks for the link.

lol, youve gotta love the LC Audio hype machine, 'NO feedback', the board is covered in feedback including a DC servo, how ridiculous ...
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Old 10th August 2013, 03:34 PM   #2952
Bunpei is offline Bunpei  Japan
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qusp, What a misunderstanding you have!

I just emphasize two points.

1. An incandescent lamp emits the least electromagnetic wave noise when we compare it to a fluorescent lamp and a LED lamp. That's the reason why an incandescent lamp is used in a special room for RF measurement.
(Of course, it emits a impulsive noise at a timing of turn ON/OFF because of a rush current. That is not a problem.)
Please check the noise an incandescent lamp emits by using an AM radio actually.
The spectrum of light emitted by a krypton light bulb is known as very similar to that of a solar light. It is based on a black body radiation of heated filament. No electric discharge event is involved.
Even if you have any concern on the use of a krypton lamp, you have a definite solution. You can simply use a solar light, instead.
Can a solar light be a known noise source?

2. A solar cell panel power supply system has the following good points
A. AC-power transformer-less, rectifier-less, smoothing-circuit-less (i.e. capacitor-less)
B. No mechanism that may introduce any ripple involved
C. A high-speed response of photoelectric effect in a semi-conductor that is faster than that of an electrochemical reaction in a usual battery can be expected
D. A solar cell can be regarded as a constant current source under a constant amount of incident light and a constant temperature
E. Providing a complete galvanic isolation with a mono-directional signal(energy) flow

"Listening is believing"!

Last edited by Bunpei; 10th August 2013 at 03:37 PM.
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Old 10th August 2013, 07:15 PM   #2953
qusp is offline qusp  Australia
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Bunpei, its not a problem that needs solving … no misunderstanding, well maybe yours

notice I said EVEN an incandescent light, after LED, bright white light, blue light and UV light itself is a noise source if you have other LEDs in the circuit, or wide band amplifiers. kryton 85, the type used, is a radiation source, as is the fluorescence. krypton is not incandescent

no I dont misunderstand that part, I know the advantages, thats why I said it was interesting, but listening alone is fooling… but none of them are any advantage over post regulated quality batteries

if you can still hear a difference between good battery with regulated supply and your solar thingy, your regulator is not working properly. its that simple, your PSRR and ripple should be so low as to be meaningless and as long as your regulator is feeding a clock on the dac board, other noise sources on the board and all around in the air will dominate.

Quote:
Can a solar light be a known noise source?
is sunlight a source of radiated noise? if its being emitted from a source right next to you absolutely it is!! its a radiation, EMI and RF noise source over a broad spectrum, not just the visible wavelengths either if it wasnt for our atmosphere, we would burn to a crisp, I think that falls within the definition of a radiated and electromagnetic noise source yes...

Quote:
A. AC-power transformer-less, rectifier-less, smoothing-circuit-less (i.e. capacitor-less)
capacitor less? that would be interesting… you want to let all the HF noise in the area have its way with no decoupling caps?


Quote:
B. No mechanism that may introduce any ripple involved
batteries have this also, of course there is a chemical reaction that makes noise, but photo cells are not completely noise free either.

Quote:
C. A high-speed response of photoelectric effect in a semi-conductor that is faster than that of an electrochemical reaction in a usual battery can be expected
then post regulate the battery, are you comparing to the solar cell without the shunt regulator? no you arent

Quote:
D. A solar cell can be regarded as a constant current source under a constant amount of incident light and a constant temperature
and the difference to a battery is? apart from the charging, but of course for the cost and massive size of this thing, I dont think you would have trouble building a battery supply that never ran out, just a switch to auxiliary while primary battery charges. I dont even think battery is needed, but thats the comparison you made.

there is no fluctuation from the ripple on the AC source for the light? how is it much different to a capacitor for light? so your power source for the light will need to be fairly good still.

Quote:
E. Providing a complete galvanic isolation with a mono-directional signal(energy) flow
this is different to a battery?

also whether you like it or not, there are parasitic noise currents everywhere

as I see it its a novelty and its huge and I dont need it, but I dont get it honestly, it just seems like a solution to a problem that is not really there. I do find it interesting from a novelty point of view and its a different solution to the problem, but thats where my interest ends. solar cells are at best 15-20% efficient, my dac already burns 100W, I dont need more overkill

Last edited by qusp; 10th August 2013 at 07:34 PM.
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Old 10th August 2013, 08:26 PM   #2954
1audio is offline 1audio  United States
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QUSP-
Krypton is used in light bulbs because its an inert gas and won't interact with the hot filament. The radiated spectrum of the bulb is quite broad (black body radiator at approx 3200 degrees K) but its modulation (the noise in the light) is very small since the thermal mass of the filament is pretty high relative to the energy input fluctuations. You won't see the 60 Hz power ripple on the output of the panel.

You seem to be responding to the Krypton hype as though its special. Light bulbs have used argon and krypton Krypton - Wikipedia, the free encyclopedia since the 1920's to conduct the heat out and make them easier to deal with, no vacuum. Its only good marketing to to take something obsure and make it special.

I explored this idea about 20 years ago. Back then the solar panels were not efficient enough and the heat output would make this seem just silly. Now it seems almost practical if incredibly un-eco.

I would put caps on the supplies, the impedance of the shunt regulator will increase with frequency (not what you want) and the panel is a current source so you need some source for HF current.

Stabilizing the light source would also be a good thing if not essential.

If this seems almost rational why not use a thermopile and a heating element as a power source?

And then this would be the ultimate audiophile power source- really exotic, expensive and unobtainable Radioisotope thermoelectric generator - Wikipedia, the free encyclopedia
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Old 10th August 2013, 11:39 PM   #2955
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The next thing you know, someone will be using a Hydrogen Fuel Cell to power
their DAC...
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Old 17th August 2013, 10:39 AM   #2956
palmito is offline palmito  United States
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Default SiS570 and lifepo battery power

The lifepo4 battery charger I got charges the battery to a tad more than 3.6vdc. The battery stays above 3.2vdc for a little while. If I setup the SiS570 board for direct battery feed, jumpering TP5/TP3, the 3.3-3.6vdc from the battery (until it drains into the "normal" 3.2vdc output) is acceptable or is it too high?

I did get the regulator from Ian but I'm installing battery power direct. Thanks in advance.
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Old 18th August 2013, 04:09 AM   #2957
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Quote:
Originally Posted by palmito View Post
The lifepo4 battery charger I got charges the battery to a tad more than 3.6vdc. The battery stays above 3.2vdc for a little while. If I setup the SiS570 board for direct battery feed, jumpering TP5/TP3, the 3.3-3.6vdc from the battery (until it drains into the "normal" 3.2vdc output) is acceptable or is it too high?

I did get the regulator from Ian but I'm installing battery power direct. Thanks in advance.
I got 3.43V from my fully charged LifePO4 cells (no load). It will run from 3.4V to 3.2V in most of working time. Though Si570 Clock board normally works no problem with 3.6V power, but I still suggest you keep your LifePo4 for a while after it been fully charged, to see if the voltage can drop a little bit lower, or try a better charger.

Regards,

Ian
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Old 21st August 2013, 06:09 PM   #2958
mcluxun is offline mcluxun  United States
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Quote:
Originally Posted by iancanada View Post
I got 3.43V from my fully charged LifePO4 cells (no load). It will run from 3.4V to 3.2V in most of working time. Though Si570 Clock board normally works no problem with 3.6V power, but I still suggest you keep your LifePo4 for a while after it been fully charged, to see if the voltage can drop a little bit lower, or try a better charger.

Regards,

Ian
Hey Ian
Would you mind to look into my problems here?

Quote:
Originally Posted by mcluxun View Post
Help needed.
Hey folks
I've been trying to hook up a raspberry pi i2s to the fifo board to make a network stream player.
Now I think Im an inch away from it. According to raspberry pi forum we could have i2s pin outs like this:
GPIO P5 TDA1541A
28 pin 3 --- BCLK
29 pin 4 --- WS
31 pin 6 --- DATA
na pin 8 --- GND
I installed i2s backdoor kits and connected
r22---pin 8
r23---pin 3
r25---pin 6
r24---pin 4
The interface board is switched to i2s input (3 lights on).
When playing 96k audio file I have the lock light on with empty and full off
When playing 48k audio file I have only empty light on.
And there wasn't any output from XLR what so ever.
After this I tried it with hiface opt input no output either.
Did I broke the output board?(again?)
I was wondering if the output side of the interface board is broken or higher up in the data chain.
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Old 21st August 2013, 06:45 PM   #2959
palmito is offline palmito  United States
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Quote:
Originally Posted by iancanada View Post
I got 3.43V from my fully charged LifePO4 cells (no load). It will run from 3.4V to 3.2V in most of working time. Though Si570 Clock board normally works no problem with 3.6V power, but I still suggest you keep your LifePo4 for a while after it been fully charged, to see if the voltage can drop a little bit lower, or try a better charger.

Regards,

Ian
Now that I connected the battery manager to the clock my charge numbers look just like yours! But when it was under no load they were higher. So it's working as intended and sounding the best my system has sounded ever. Thanks again Ian.
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Old 22nd August 2013, 08:43 PM   #2960
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Quote:
Originally Posted by palmito View Post
Now that I connected the battery manager to the clock my charge numbers look just like yours! But when it was under no load they were higher. So it's working as intended and sounding the best my system has sounded ever. Thanks again Ian.

Good to know that, congratulations!

Now you can try some good clocks and enjoy your music.

Ian
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