Hehe, I heard some Squeezeboxes at the UK meet last year... I thought the sound of nearly every demo was a bit "wrong" lol. Garbage in garbage out!
Let us know what you do.
Simon
Let us know what you do.
Simon
U218?
so to give the Decoder its own +5v I would disconnect U182
-input voltage from +POS side of C813
Gnd to Gnd plane
Output into U182 to feed +5 into decoder via R508 and R511
for Dacs own +5v I would disconnect U164
-input voltage from +POS side of C813
Gnd to Gnd plane
Output into U164 to feed +5 into dac
also On the Gnd to Output of the Reg is there a need for a Cap?
does anyone know what the mA requirments for the Dac/Decoder are
when connecting extra regs does it matter where the Gnd gets connected to, should it be as close as possible to the Reg?
sorry you have probable been over this a thousand times
Cheers
so to give the Decoder its own +5v I would disconnect U182
-input voltage from +POS side of C813
Gnd to Gnd plane
Output into U182 to feed +5 into decoder via R508 and R511
for Dacs own +5v I would disconnect U164
-input voltage from +POS side of C813
Gnd to Gnd plane
Output into U164 to feed +5 into dac
also On the Gnd to Output of the Reg is there a need for a Cap?
does anyone know what the mA requirments for the Dac/Decoder are
when connecting extra regs does it matter where the Gnd gets connected to, should it be as close as possible to the Reg?
sorry you have probable been over this a thousand times
Cheers
rowemeister said:
Luke said:
You mean the Twisted Pear Opus? The one that uses the Wolfson WM8740. Interesting.
Well I was considering the DacMagic from Cambridge. At £200 it has two s/pdifs and a USB (though I won't use the latter) and has a pair of those DACs in dual differential mode, upsampling via a 32-bit TI DSP, and is in a nice little SB3-sized box with the DAC filter settings available via a front-panel button. I'm not sure I could build it with TP parts for the same price, and if I did it wouldn't be in a nice box and easily resellable.
The man from CA says they tried the WM8741 (which TP have switched to) but preferred the WM8740, which has found it's way into the Rega, Arcam and Cambridge players lately I noticed.
Hi Brentrowemeister said:
I believe I should understand the GND issue before progressing.
Looking at the schematic, I found at least 4 GND points in the white ribbon connecting the mech pcb to the main one.
As one GND should be enough there, I believe some of the tracks are meant to shield signal routings....
I did not touch the mech pcb "yet" so I did not connect it to the star gnd..... As I will not disconnect the existing GND on the ribbon, what improvements should I expect by connecting the mech pcb to the star gnd ?
Ricardo
Yes I do. Im might give the sabre a try at some stage. Ive not heard of the dac magic. For that sort of money you cant really go wrong, and yes it has resale. Have you heard a dac magic?
Glenn2 said:
Brent / Audio Upgrades-modified CD72 sounded very, very good! Oddly the basic Cambridge players don't seem to sound as good, modified or not. Same DAC chip I think.
Simon
SimontY said:
Interesting - I think that player is BB PCM1716. Like the Alpha 7SE I had in my hands recently. I didn't like that much, by the way.
Luke - no I've not heard the Dacmagic, but three of the British hifi rags gave it a gigantic thumbs up. Oh and Hifi+ just did too.
The Squeezbox is sounding much better now. Using a transformer based PSU I had lying around instead of the SMPS that came with it. Not painful now (or maybe the SB just burnt in.)
just heard a duet and I got goosebumps listening to bjork.
The chain was duet, mark levinson 380s pre, no.332 power and wilson watts. I came home listened to my home brew valve pre aleph twos and kls10 speakers and got depressed. I need to start all over
Any one here listened to a levinson no332? I think its the best amp Ive ever heard.
The chain was duet, mark levinson 380s pre, no.332 power and wilson watts. I came home listened to my home brew valve pre aleph twos and kls10 speakers and got depressed. I need to start all over
Any one here listened to a levinson no332? I think its the best amp Ive ever heard.
Hello,
Guys can I replace Q811 and Q871 (both are 7805A) with LM340AT 5.0 one to one? Or additional circuit moding will require.
Thanks,
Aram
Guys can I replace Q811 and Q871 (both are 7805A) with LM340AT 5.0 one to one? Or additional circuit moding will require.
Thanks,
Aram
In the CD67 could i use instead of the 2114D-JRC the AD812AN ?
here is the datasheet:
http://www.analog.com/static/imported-files/data_sheets/AD812.pdf
here is the datasheet:
http://www.analog.com/static/imported-files/data_sheets/AD812.pdf
billman said:
Can someone please comment on this. I would like to have it done before X-Mass! Thanks
billman said:
Hi billman,
This opamp is pin-compatible, but it's a current feedback opamp. That's not suitable, you need a voltage feedback type.
Regards,
Ray
e1roy said:
Hi e1roy,
That's not entirely correct. You see, U182 feeds some other things besides the decoder. It's better to remove R508 and U179, tie the tracks together on the decoder side, and use a 5V reg to feed this. + supply can be taken from C813 indeed, and output and GND should be close to the decoder. An output cap is good for stability, 1u MKT is a minimum, or a 100u or so low-ESR cap (Pana FC and the like).
For the DAC you can do the same, U164 will disable 5V to the DAC completely. Total current is about 30mA maximum in this case. But even better is to separate the different DAC supply pins by removing RD01, RD04, U200 instead, and use three regs to feed it. Small input and output caps are recommended. For some regs it may be needed to use an extra 470R load resistor at the output, to make sure there's at least 10mA current draw.
Regards,
Ray
