Aleph-P 1.7 PCB layout - diyAudio
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Old 4th July 2004, 10:49 PM   #1
Kari is offline Kari  Sweden
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Default Aleph-P 1.7 PCB layout

Hi,
i thought that i'd ask here about my Aleph-P pcb layout. Any comments? Suggestions are very welcome. I have three different gnd's on it, input, output and power. Power gnd is btw ment to fill out the whole pcb.

Thx in advance,

Kari
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Old 4th July 2004, 10:58 PM   #2
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1. Don't use screw terminals - they are convenient but degrade sound.
2. Put the power connector elsewhere - further away from signals
3. Add film decoupling caps to power supply
4. Reconsider whether you want to have the ground plane on the entire bottom or not. You will get capacitive effects - I cannot tell you if it is optimal or not - just be sure about what you are doing and why.

Good luck
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Old 5th July 2004, 12:01 AM   #3
Kari is offline Kari  Sweden
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Thx for the advise. I have now removed the screw terminals. I have also removed the groundplane. Please check the picture. Also remember that this is actually my 2:nd pcb "design".

Thx,

Kari
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Old 5th July 2004, 01:58 AM   #4
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Don't change your design so easily. In the scheme of things the PCB terminal blocks don't make much of a sonic difference. I also think your ground plane is just fine. Just make sure that all grounds get tied together at one point and tie that point to earth through and pair of opposing diodes. I also don't think there is a power supply on your board so I don't understand the comment about the decoupling caps although it is good advice for the power supply board design.
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Old 5th July 2004, 06:38 AM   #5
ARAD is offline ARAD  Germany
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Kari,

nice clean layout. I would consider

- to have a (partial) groundplane,
- to use screw terminals for power (I agree with Petter for the signal connectors),
- to have a more 'flexible' layout for the coupling capacitors - there was a number of comments that it might be a good idea to experiment with those. You have enough space to provide solderpads for different Cs.

Keep us posted of any progress,

regards,
Andreas
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Old 5th July 2004, 10:29 PM   #6
Kari is offline Kari  Sweden
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Again, thx very much for your help. After thinking about it i decided to use a groundplane connected to pwr gnd. I also add a few options for the caps. You can either use "standard" Wima, EvoxRifa 10uF caps with a pitch of 37.5mm. You can also use Mcap/SCR 10uF caps on the input side and 2x15uF on the output side. You can also use a 33uF cap.

Any comments so far? I'm still searching for a cheap/good quality boardhouse. http://www.olimex.com comes to my mind.

If i haven't made any major mistakes i will send this layout to be manufactured. I just need to fix a bom and edit the silkscreen for correct partnumber (ie. R1, R2 and so on).

Atm i'm working on the powersupply and decided to use schottky diodes (100V, 8A). Is it better to have a RC network in paralell with the diodes?

Thx again,

Kari
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Old 5th July 2004, 11:07 PM   #7
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If I recall correctly there is a thread somewhere on this forum where Nelson Pass states that he does not like the snubber networks that people use on the fast recovery diodes. I seem to recall this but I could be wrong. A search will tell for sure. I personally do not like the snubber networks.
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Old 6th July 2004, 01:18 AM   #8
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You know Kilowattski, with the possible exception of Magura's
avatar, I think yours are the best.

In point of fact I favor RF snubbers on all power supply rectifiers,
although it would seem that the soft recovery types have some
of that built in already.

Mind you, it's a matter of RF emission, and if you put the
bridge 20 feet away from the circuit and use CRC or CLC
filters and caps across the AC line, I don't care what you
do.
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Old 6th July 2004, 02:19 AM   #9
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Maybe the first thing that goes, really is the mind.....I stand corrected.
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Old 6th July 2004, 02:48 AM   #10
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I have a list of what I hope doesn't go first, and the mind is
not #1.
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