| ZERS |
Hi,
going further with my DIY CDPLAYER, I've completed most of the schematics and the boards (DAC, PSUS). :cool:
The CDPLAYER will be based on the CDPRO2 drive and the dac is using 2 TDA14541A in //, the output buffer using 2 6C45PI tubes.
I decided to use a ground plan for this DAC, thus avoiding me to search for ages the best connection between both analog and digital grounds ;)
Unfortunatly, I'm facing up an issue with this ground plane. A small part of it is "isolated", meaning that this part is not connected to the main one. :bawling:
On the board, you could see this part : this is the one where C2_21, ...C2_19, C2_VDD2 are connected to.
You will see as well that I have added a short route on the top layer (in RED) between C1_10 and and C2_19 to link the isolated ground to the main one.
But I don't want to make a 2 layers board. I was previously thinking of replacing those TOP routes by Wires soldered point to point.
I guess It would'nt be a big issue for 2 of them (-15V & OUT_Left routes) but for the link between the 2 ground planes, I'm not sure that It won't cause any oscillation or other issue. :eek: :cannotbe:
As I could not post the schematic and the board here (they are too bigs even when zipped :eek: ), you could find them here (in a french forum sorry :xeye: ) : DAC SCHEMATIC AND BOARD
The DAC.ZIP file contains the schematic and a old version of the board, please look into the CARTEDAC.JPG file attached below to have the newest one.
What do you think about connecting with a wire ? Do I try to avoid it ?
Anway, feel free to comment the schematic and the rest of the board if you find something wrong :rolleyes: ;)
Thanks in advance |
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| jean-paul |
Hello Zers, I think the advantages* of using parallel DACs will weigh up against the layout problem. Optimising the layout for 1 chip will be difficult enough but easier than with 2 chips... As I checked the layout I got the idea the questions you pose will not arise as much when using 1 chip, which is a big plus.
* paralleling sounds worse in my ears, did you breadboard this paralleled DAC and did you listen to it ?
Your PCB-design will definitely benefit from designing it double sided ( especially the ground plane ). Why not go for the best while you're working at it and put all your time in it anyway ?[ |
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| ZERS |
| quote: | paralleling sounds worse in my ears, did you breadboard this paralleled DAC and did you listen to it ?
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I did obvioulsy, but I didn't compare to a single DAC ;) . The sound seems to me really good.
| quote: | | Your PCB-design will definitely benefit from designing it double sided ( especially the ground plane ). Why not go for the best while you're working at it and put all your time in it anyway ?[ |
Because it's gonna be hard to find a manufacturer that could build the double side board for a good price.
But I'm open minded :) ;) |
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| TDA1540 |
[QUOTE]Because it's gonna be hard to find a manufacturer that could build the double side board for a good price. [/QUOTE
with one side used as a groundplane ,it is essentially a singlesided pcb you want to make. |
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