Electronics > Beginners

Why am not able to get a grasp of PCB designing?

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redgear:

--- Quote from: tautech on November 27, 2019, 09:12:08 am ---
--- Quote from: redgear on November 27, 2019, 08:26:03 am ---Yep, I am not telling it is not useful. But as a beginner looking at ratsnet is scary for me. And how much ever orientations I try I am not able to untangle them.

--- End quote ---
Yeah well you did take on something a bit complex first up.

The ratsnest is you placement lifeline first then your eyes as to possible routing solutions.
Something less complex and forcing yourself to do it on a single layer is the way to get your head around it along with a not too stifling PCB size until more experience is gained.

It might seem I ramble on a bit but my posts are not just directed at you but for the wider audience that also follow this stuff.  ;)

Still, do show progress as there's plenty of us here to help if you get really stuck.

--- End quote ---


Started working on the new PCB.

So far...

tautech:

--- Quote from: redgear on November 28, 2019, 10:45:40 am ---Started working on the new PCB.

So far...
(Attachment Link)

--- End quote ---
Had a look at the new schematic and wondered why you have so many caps on the same rail and their purpose ?  :-//

What's DS1 ? See how many ratsnest traces go to it from the tight side of the IC. Pop that IC on the other layer and it becomes flipped so that bundle of ratsnest traces will be easier to route.
Several of the bipolar/FET traces come from the same side of the IC so they all might benefit from flipping it onto the other layer.

BTW, don't embed the image, just keep it as a thumbnail then we can download it a blow it up larger more easily.  ;)

redgear:

--- Quote from: tautech on November 29, 2019, 09:32:14 am ---Had a look at the new schematic and wondered why you have so many caps on the same rail and their purpose ?  :-//

--- End quote ---

I designed it based on the reference design on the datasheet. The capacitors are for reducing ripple and EMI. The previous design had an extra elcap which I have not included in this design. I am thinking if I should add it for extra stability.

--- Quote ---What's DS1 ? See how many ratsnest traces go to it from the tight side of the IC. Pop that IC on the other layer and it becomes flipped so that bundle of ratsnest traces will be easier to route.

--- End quote ---
It is a 7 segment LED Display. Ok  :-+


--- Quote ---Several of the bipolar/FET traces come from the same side of the IC so they all might benefit from flipping it onto the other layer.

--- End quote ---
Ok, will flip the FETs to the other side of the board.


--- Quote ---BTW, don't embed the image, just keep it as a thumbnail then we can download it a blow it up larger more easily.  ;)

--- End quote ---
Noted.

tautech:

--- Quote from: redgear on November 29, 2019, 09:57:54 am ---
--- Quote from: tautech on November 29, 2019, 09:32:14 am ---Had a look at the new schematic and wondered why you have so many caps on the same rail and their purpose ?  :-//

--- End quote ---

I designed it based on the reference design on the datasheet. The capacitors are for reducing ripple and EMI. The previous design had an extra elcap which I have not included in this design. I am thinking if I should add it for extra stability.

--- End quote ---
8x 22uF caps, that's nuts !  :-//
Ceramic, right ?
Sub them out for a couple of 100uF SMD tantalums.

redgear:

--- Quote from: tautech on November 29, 2019, 10:06:40 am ---8x 22uF caps, that's nuts !  :-//
Ceramic, right ?

--- End quote ---
Yeah, ceramic. This is my first project so haven't tried anything out of the datasheet.

--- Quote ---Sub them out for a couple of 100uF SMD tantalums.

--- End quote ---
Ok, so 100uF on both SW and VOUT networks,right?

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