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In Reply to: RE: Further Juli@ Follies... posted by GStew on October 13, 2011 at 19:17:53
Today i accidentally put 3,3v on the 5v-point of the Juli@ and it worked. I use only the digital part.
The 5v 'fingers' of the card are broken to disconnect the mobo-5v. 5v is suplplied by a linear psu. The regulator is capped before and after (capped 5v-grnd and 3,3v-grnd).
Today i used this psu to charge a LiFePo4, so it was set to 3,6v to do so. Later on i reconnected the Juli@, and forgot to set the psu back to 5v. Juli@ worked! Then i connected the LifePo4 to the 5v-point of the Juli@ and it sounded better than with psu.
I checked the datasheets of the digital chips, and they all work within the range of 3,0 - 5,5v.
Next step will be desoldering the regulator and feed 3,3v to both 5v and 3,3v holes on the Juli@-board.
Still, could somebody try this tweak and report, because i'm not shure i did right. If it works right, we could save one supply on the digital part of Juli@.
Douwe
Follow Ups:
Hi Douwe,
I can confirm it.
I could easily check it.
I have 2 power lines running from a 5 volt linear PSU.
One power line runs too a 5 V -> 3,3 V regulator and from here too the 3.3 volt input on the
Juli@ card (I unsoldered the stock regulator).
The other power line runs too the 5 Volt header on top of the Juli@ digital part.
(I use optical out too my Lavry DAC)
I hooked up this second 5 Volt line too my TTI PL330TP linear PSU and regulated it down from 5 V too 3,3 volt.
The juli@ digital part keeps working on 3,3 Volt.
On 3,3 volt the current is 0.13 A.
On 5 Volt the current is 0.18 A.
On 2.2 Volt the Juli@ digital part stops working.
So you are right.
Only 3,3 Volt will do.
I hear no sound quality differences between 5 Volt and 3,3 Volt.
Nice find.
Mark
cMP2 PC > ESI Juli@ > Van den Hul Optocoupler MkII > Lavry Black DA10 > XLR Mogami Gold > Klein & Hummel O300
Yes there is...right at the bottom of where you post a response you will see E-mail replies...just check the box.
That sounds real promising. I am not able to check this because I need to buy another juli@ to experiment with. I once used a 12 v lead acid battery (regulated down to 5v) to power the 5 volt rails but I ended up frying the juli@ card and was reluctant to go back. But If I could LiFePo4 (which I use for the 3.3v feed) that woud be real convenient. I have extra LiFePo4's and the requisite chargers. So let me understand you ran 3.3 v to the 5 v hole-through input on the card? Does the LiFePo4 feed go through regulators or did you bypass?
Wow, that's fast theob! is there a setting whith which you are told there are new posts? If so, please tel me know.
Yes, i cut the 5v-fingers, and put the LiFePo4 into the 5v-hole on the card (DVCC1). I did not bypass the regulator, did not feed the P3V3D1 hole.
I googeled on regulators and understand they only regulate if the difference in/out voltage is higher than 1,5v. If not, no regulation (and so passing through the 3,3v i guess). So there would be more to gain by removing the U1 regulator.
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