Electronics > Beginners

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

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tautech:

--- Quote from: redgear on November 15, 2019, 08:28:52 am ---I really appreciate you taking the time to guide me. Thank you so much.

--- End quote ---
No probs, I just happened to the Johnny on the spot.  :)
I don't do much now but really got hooked on making a nice job of PCB's for a while as with a little bit of practice it gets quite addictive. After a bit you can pick holes in most ppls work and see how you might have done it better. You can spend days on even a modest PCB, layout correction after another then a heap of time interactive routing but guys that can really make CAD programs talk spend a bit of time on the global settings then the program does most of the work.
Still you learn a lot doing it longhand as it were then with the good CAD programs let the settings made save you the hassle.

--- Quote from: redgear on November 15, 2019, 08:28:52 am ---
--- Quote from: tautech on November 15, 2019, 07:09:55 am ---Don't bunch SMD passives too close to bigger components. (later you'll thank me.  ;) )

--- End quote ---
Are you talking about the capacitor networks? Aren't they supposed to be as close as possible to the ICs?

--- End quote ---
No, it's just a general statement for C's and R's.
Earlier I said always to consider rework so if placement doesn't allow getting an iron to a component how do you replace just that component should you need to ? For first up prototypes this can be important as there's often component substitutions to make the circuit work as planned.
Yeah I know, drag out the hot air you'll say but what about all the surrounding components when you could have done it with an iron. BTW if you haven't got a K style Hakko type tip get one ! Some call them a skew but either way they allow the ability to heat both ends of SMD passives for shit easy removal.

Rerouter:
The capacitors should be as close as reasonable, (minimizing inductance, loop area, all that jazz) but if the capacitor is so close to the IC or another capacitor that it is a right pain to prevent shorting or fit, then it kind of hurts the benefit of the closer positioning, `

remember the loop for decoupling includes any via's, and the ground routing on the other side, this is why decoupling caps on really fast devices (high switching frequencies) will have the decoupling capacitor practically straddling the vias for a short run back to the pins that it needs to decouple, or in some cases routed with the return path coupled as close as possible,

NivagSwerdna:
re: Image above

Much better.  Imagine you are trying to unknot a ball of string...

By flipping the components you can untwist the string... all 3 parts in the top left are obvious candidates.

ebastler:

--- Quote from: Ariousig on November 15, 2019, 12:41:04 pm ---Give yourself a series of tasks.

--- End quote ---

It's best to actually read the thread, not just the title of the first post, before replying.  :P

And no, I'm feeling fine, thank you very much.
Interesting choice of user name...

redgear:

--- Quote from: tautech on November 15, 2019, 08:58:40 am ---You can spend days on even a modest PCB, layout correction after another then a heap of time interactive routing but guys that can really make CAD programs talk spend a bit of time on the global settings then the program does most of the work.
Still you learn a lot doing it longhand as it were then with the good CAD programs let the settings made save you the hassle.

--- End quote ---
After I finish this PCB, I will see what all settings I can play with to make this job easier....
In your last post you suggested me to consider rearranging the FETs, but I am not able to find a better place.  :-BROKE

--- Quote ---No, it's just a general statement for C's and R's.
Earlier I said always to consider rework so if placement doesn't allow getting an iron to a component how do you replace just that component should you need to ? For first up prototypes this can be important as there's often component substitutions to make the circuit work as planned.
Yeah I know, drag out the hot air you'll say but what about all the surrounding components when you could have done it with an iron. BTW if you haven't got a K style Hakko type tip get one ! Some call them a skew but either way they allow the ability to heat both ends of SMD passives for shit easy removal.

--- End quote ---
Thanks for the recommendation, I'm actually planning to invest on a good soldering station. :)


--- Quote from: Rerouter on November 15, 2019, 09:11:32 am ---The capacitors should be as close as reasonable, (minimizing inductance, loop area, all that jazz) but if the capacitor is so close to the IC or another capacitor that it is a right pain to prevent shorting or fit, then it kind of hurts the benefit of the closer positioning, `

remember the loop for decoupling includes any via's, and the ground routing on the other side, this is why decoupling caps on really fast devices (high switching frequencies) will have the decoupling capacitor practically straddling the vias for a short run back to the pins that it needs to decouple, or in some cases routed with the return path coupled as close as possible,

--- End quote ---
Thank you, another reason for me placing them very close is they looked better that way.

--- Quote from: NivagSwerdna on November 15, 2019, 09:52:43 am ---re: Image above

Much better.  Imagine you are trying to unknot a ball of string...

By flipping the components you can untwist the string... all 3 parts in the top left are obvious candidates.

--- End quote ---
Thanks, I can't move the USB ports and the switch, I placed them according to their mechanical orientation.

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