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Old 25th September 2004, 12:10 AM   #1
Kari is offline Kari  Sweden
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Default Comments on my Aleph-X layout?

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
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Old 25th September 2004, 06:01 PM   #2
Netlist is offline Netlist  Belgium
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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
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Old 27th September 2004, 04:51 PM   #3
Kari is offline Kari  Sweden
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I have now updated the layout. Thx Netlist. Anyone else have any comments?

Thx,

Kari
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Old 29th September 2004, 09:05 PM   #4
joho is offline joho  Netherlands
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Thumbs up 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.
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Old 29th September 2004, 09:11 PM   #5
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Quote:
Did you have any special reason to use 90 degrees curves?
Shorter trace length?
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Old 29th September 2004, 09:17 PM   #6
BrianGT is offline BrianGT  United States
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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
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Old 29th September 2004, 10:46 PM   #7
Kari is offline Kari  Sweden
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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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Old 30th September 2004, 02:27 AM   #8
BrianGT is offline BrianGT  United States
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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
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Old 30th September 2004, 06:14 AM   #9
Anvil is offline Anvil  Finland
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Lightbulb 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
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Old 30th September 2004, 01:56 PM   #10
dobbeln is offline dobbeln  Germany
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Default 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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