Drive NOS AD1865/62,PCM1704/02/63,TDA1541 from FIFO: Universal I2S-PCM driver board - Page 25 - diyAudio
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Old 31st January 2013, 08:24 AM   #241
erin is offline erin  Australia
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Quote:
Originally Posted by dtses View Post
+1 please!
Total 69.
You are meant to put your name on the end of the list.. but I have done it for you.

I'm also changing mine to 1 (or 2) -depends on the final price

TV Man x 2
merlin el mago
rtd
jameshillj
erin x1 (or 2)
Nikola Krivorov x 3
Rupor54
vitalica
analog_sa
andrea_mori x 5
dsavitsk
tagheuer
hirez69 x 2
ccliu x 2
BDL
cddumat
regal x 2
zoran
Jogi
Zen(zenelectro) x 2
Buzzforb
SPWON
crobbins5421 X 2
marcus1 X 2
casshan x 2
Dweeb99 X 2
jackw X 2
kazap X 2
danzup x 3
Giordano x2
Tony_T
Tubo x1
clivem x2
noizas x2
JoeyDD x2
skullaudio
dinos8746 x2
dvb-projekt
bisesik x2
guglielmope x1
Valeriano x1
mhgawel x1
av-trouvaille x 1 (or 2)
iloveswan x1
dtses
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Old 3rd February 2013, 03:24 AM   #242
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Default I2S to PCM daughter board new PCB design GB version V2.0

PCB design revised once again

1. Layout was optimized for low noise and transition line impendence matching
2. Double CLK and LLLR outputs for dual mono DACs
3. Enhanced power supply layout available for both on board low noise LDO and external high quality PSU
4. Additional DC output connector position for powering the possible I2S isolator

Please let me know for any comment.

Ian
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File Type: png BOTTOM.png (60.5 KB, 306 views)
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Old 3rd February 2013, 12:14 PM   #243
vzs is offline vzs  Europe
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Hello Ian, all enhancements are welcome - especially the first two

From a two layer board I think you squeezed out the maximum.
I have one suggestion regarding the bottom side output LLLR, CLK traces: it seems that they intersect the top LLLR, CLK so neither have a continuous ground plane beneath/above - you could trace them as their top counterparts so both would see continuous ground plane beneath/above. If this is not possible I would rather skip the bottom outputs.

Would a four layer board raise fabrication costs too much?
Zsolt
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Old 3rd February 2013, 12:17 PM   #244
qusp is offline qusp  Australia
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4 layer raises costs massively. you cannot find reasonable short run 4 layer deals anywhere. I would think not only would it add more time for Ian, but t would likely double the cost (of the PCB)

Last edited by qusp; 3rd February 2013 at 12:20 PM.
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Old 3rd February 2013, 12:37 PM   #245
vzs is offline vzs  Europe
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It raises indeed... at the factory from Hungary I know it raises from ~4EUR (2 layer) to ~11EUR (4 layer)/piece - for a batch of 80.
...of course we shouldn't count only these +7euros as there would be more work from Ian's side to redo the ground planes.

Last edited by vzs; 3rd February 2013 at 12:41 PM.
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Old 4th February 2013, 02:27 AM   #246
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Quote:
Originally Posted by vzs View Post
Hello Ian, all enhancements are welcome - especially the first two

From a two layer board I think you squeezed out the maximum.
I have one suggestion regarding the bottom side output LLLR, CLK traces: it seems that they intersect the top LLLR, CLK so neither have a continuous ground plane beneath/above - you could trace them as their top counterparts so both would see continuous ground plane beneath/above. If this is not possible I would rather skip the bottom outputs.

Would a four layer board raise fabrication costs too much?
Zsolt
Hi Zsolt,

You make a very good point. I move the two bottom u.fl sockets to a better position, now all the impendence controlled traces have continues ground plate underneath.

With same FR4, the main difference between 4L and 2L is that 50 ohm impendence trace on 2L is much bigger than on 4L. However if we could make the trace short enough, it won't take that much space on PCB. Actually, for a same board layout, four layer design is easier than two layer design. However, for a small quantity production, the cost will be increased rapidly. If we go four layer, the finial price of the finished board can close to $90, thatís too much for this daughter board I think.

Ian
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File Type: png TOPnew.png (94.0 KB, 249 views)
File Type: png BOTTOMnew.png (59.6 KB, 232 views)
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Old 4th February 2013, 02:38 AM   #247
qusp is offline qusp  Australia
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yes easier if you havent already done a 2 layer layout which was my point. thanks for the reminder re 2L vs 4L impedance. board is looking good, so sexy i'm making excuses again why I need one
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Old 4th February 2013, 05:57 AM   #248
flyboi is offline flyboi  Malaysia
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1 for me too. Total now 70.

TV Man x 2
merlin el mago
rtd
jameshillj
erin x1 (or 2)
Nikola Krivorov x 3
Rupor54
vitalica
analog_sa
andrea_mori x 5
dsavitsk
tagheuer
hirez69 x 2
ccliu x 2
BDL
cddumat
regal x 2
zoran
Jogi
Zen(zenelectro) x 2
Buzzforb
SPWON
crobbins5421 X 2
marcus1 X 2
casshan x 2
Dweeb99 X 2
jackw X 2
kazap X 2
danzup x 3
Giordano x2
Tony_T
Tubo x1
clivem x2
noizas x2
JoeyDD x2
skullaudio
dinos8746 x2
dvb-projekt
bisesik x2
guglielmope x1
Valeriano x1
mhgawel x1
av-trouvaille x 1 (or 2)
iloveswan x1
dtses
Flyboi X1
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Old 4th February 2013, 06:42 PM   #249
vzs is offline vzs  Europe
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Looks good Ian, hope to see it ready soon
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Old 6th February 2013, 03:19 AM   #250
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With two layer, the PCB thickness has to be 0.8mm to keep the impedance matching . Four layer PCB can go 1.6mm no problem. For the finished board, how many people want the four layer PCB? And how many people think it not worth it?

Ian
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