Comments on my Aleph-X layout?

Kari · 25th September 2004, 12:10 AM

Hi,
thought that i'd show my pcb layout of AX. It is based on the schematics i found on KK's webpage. Please comment if you see something totally wrong. Any help would be greatly appreciated.

Thx,

Kari

Netlist · 25th September 2004, 06:01 PM

I'm certainly not an expert in PCB's but it looks like you reserved no space for the diffpair heatsink. They can live without but DC will be more stable if you connect them thermally.

/Hugo

Kari · 27th September 2004, 04:51 PM

I have now updated the layout. Thx Netlist. Anyone else have any comments?

Thx,

Kari

joho · 29th September 2004, 09:05 PM

Hello Kari,

Nice symmetrical design.

Maybe the powerlines are a little thin. Make them dubblesided with some via's to connect them.

Did you have any special reason to use 90 degrees curves?

Regards,
Johan.

vdi_nenna · 29th September 2004, 09:11 PM

Quote:

Did you have any special reason to use 90 degrees curves?

Shorter trace length?

BrianGT · 29th September 2004, 09:17 PM

You could add some heat-relief traces to make soldering easy. My Aleph-X board was quite difficult to solder, as I had none.

--
Brian

Kari · 29th September 2004, 10:46 PM

Hi,
thanks for the input. No i don't have any special reason for 90 degree angels on the tracks. Does it matter?

BrianGT: As i am using Eagle for this i assume u mean "thermals" on the pads?

I also got the quote from my pcb fab. 4 pcs with redsolder mask is 100USD (I will order this). However if anyone is interested i can get 10pcs for 120USD and 20 pcs for 190USD.

I'll post a new picture of the pcb as soon as i'm done with the modifications.

Thx again,

Kari

BrianGT · 30th September 2004, 02:27 AM

Quote:

Originally posted by Kari
BrianGT: As i am using Eagle for this i assume u mean "thermals" on the pads?

Yes, thermals = heat relief traces

--
Brian

Anvil · 30th September 2004, 06:14 AM

Dont use 90 degree angles. It is not good, the width of the trace changes and so does the impedance. Round curve is the best one, but 45 degree angle will do nicely.

Regards

Anvil

dobbeln · 30th September 2004, 01:56 PM

Hi,
you should add some space between the diff-pair to spend a little heatsink to the fets and perhaps some more space to the componrents around (depends on the dimensions of the heatsink).
Would be interested in some boards, too.

Bye

29th September 2004, 09:05 PM	#4
joho diyAudio Member Join Date: Jul 2003 Location: Sliedrecht Z-H	pcb-layout Hello Kari, Nice symmetrical design. Maybe the powerlines are a little thin. Make them dubblesided with some via's to connect them. Did you have any special reason to use 90 degrees curves? Regards, Johan.

30th September 2004, 06:14 AM	#9
Anvil diyAudio Member Join Date: May 2003 Location: Oulu	curves Dont use 90 degree angles. It is not good, the width of the trace changes and so does the impedance. Round curve is the best one, but 45 degree angle will do nicely. Regards Anvil

30th September 2004, 01:56 PM	#10
dobbeln diyAudio Member Join Date: Jun 2004 Location: Wolfenbüttel	pcb Hi, you should add some space between the diff-pair to spend a little heatsink to the fets and perhaps some more space to the componrents around (depends on the dimensions of the heatsink). Would be interested in some boards, too. Bye

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25th September 2004, 06:01 PM	#2
Netlist diyAudio Moderator Join Date: Jan 2003	I'm certainly not an expert in PCB's but it looks like you reserved no space for the diffpair heatsink. They can live without but DC will be more stable if you connect them thermally. /Hugo

29th September 2004, 09:17 PM	#6
BrianGT diyAudio Moderator Emeritus Join Date: Jan 2002 Location: near Atlanta, GA	You could add some heat-relief traces to make soldering easy. My Aleph-X board was quite difficult to solder, as I had none. -- Brian

29th September 2004, 10:46 PM	#7
Kari diyAudio Member Join Date: Jan 2004 Location: Stockholm	Hi, thanks for the input. No i don't have any special reason for 90 degree angels on the tracks. Does it matter? BrianGT: As i am using Eagle for this i assume u mean "thermals" on the pads? I also got the quote from my pcb fab. 4 pcs with redsolder mask is 100USD (I will order this). However if anyone is interested i can get 10pcs for 120USD and 20 pcs for 190USD. I'll post a new picture of the pcb as soon as i'm done with the modifications. Thx again, Kari

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