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In Reply to: RE: Juli@ external PSU/batteries posted by promethk on March 30, 2009 at 09:20:55
i tried the xonar with an external PS ( also batteries) and it was better than the untweaked Juli@ in the SPDIF-setion.
The next step was Juli@ in the I2S mode: much better than Xonar over Spdif.
Now the Juli@ >>I2S and batteriepowered plays in a comletely other league.
Follow Ups:
Thank you for sharing this great finding!
Can you please post a pic of your Juli@ wired to an battery PSU? It will be much appreciated.
Juliamod:
Hi - this may be a dumb question but I was just wondering why 4 x 6volt batteries? Are they in series or parallel? I assumed parallel to give a more solid supply.
I have tried to read the page on the regulator you mentioned - unfortunately my German is about as good as my French (non-existant!!).
I get the gist of what they are saying - the diagrams do help a lot.
hi,
four batteries for the SQ!! .
One sealed acid batterie will sound clean but dull. If You take 3 or 4 prarallel ( i take 8 for my tripath Amp) you lower the inner resistance (like the effekt of low ESR caps) and it sounds better than any PS i know.Try it and you never go back to normal PS`s.
I work with batteries for 15 years and use them for amps DAC and PC and the inconvenience of charging is nothing against SQ.
Thanks sonics - I will certainly try this mod - in the UK the Panasonics seem to be difficult to get - looks like I will have to order from the States.
hi sondale ,
the problem of comparing batteries with PSUs is that most of the DYIs use one batterie and thats the end of the story.
The brand of the batteries is not as important as the number of the batteries. There is a difference in the inner resistance of certain batteries ( Low ESR Optoma or northstar long life expectance, but 200€ for one) but if you take four cheap ones you get 1/8 of inner resistance of one
You will hear the difference.The biggest effect is in combination with Class-D Amps.My new combo blows away my old 20.000€ tube amp.But also the buffalo, the Juli@ my zap-outputstage and the pc are on much higher level than with conventional PSUs.
If You decide to do it You take four 6 Volts parallel to a regulator ( thel or like hanssatink did it) and do the charging when you stop playing with a constant voltage source at 6,9 Volt , so there is no problem of overcharging and the charger can be connected all the time.Full charging is at 7,2 Volt.
bye
alfred
PS: i compared NiMH ,Lithium and normal alkalines and the paralleled sealed acid are the winner.
alfred wrote:
but if you take four cheap ones you get 1/8 of inner resistance of one
Your argument is generally sound but the total internal resistance of four batteries in parallel is a quarter, not an eighth, of the IR of each.
1/R tot = 1/R1 + 1/R2 + 1/R3 + 1/R4 . . .
I know this is off-topic but my experience is that a Tripath-based amp sounds much poorer running at 12 volts than at 13.5 - which is why many owners use linear PSUs designed for CB radio. Comments?
Dave
offtopic but you are right, i use 8 batteries with my tripath 2021 and so it is 1/8.
The tripath 2021 with 12,64V is as good as with 13,8 because i use it with a 98 dBH loudspeaker , so it don't reach the limit of distorsion.
"I know this is off-topic but my experience is that a Tripath-based amp sounds much poorer running at 12 volts than at 13.5 - which is why many owners use linear PSUs designed for CB radio. Comments?"I disagree. Tried 12 volt batterie and full loaded same 13,6 batterie.
No hearable difference. Low voltage D-amps are current suppliers. The ESR must be as low as possible, so there is no voltage drop when charging the amp.Have put 20 high grade capacitors (Panasonic FM's) 1000 uf parallel to the PS entrance of the t-amp chip.
Edits: 04/04/09
Thank you for taking the time to give the detailed instructions, though I was more looking forward to a picture of the Juli@ and its PSU in your system.
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