[SOLVED] i want to optimize this PCB using EAGLE

[Qwme5]

Hi am new in designing any kind of PCB i start my design using eagle 5.11.0 i draw the circuit diagram without any problem my problem is i cant draw the pcb correctly i uploaded both of the circuit diagram and PCB diagram its kinda messy so i need ur help to minimize the no of jumpers and optimize the overall schemeView attachment schemet.rar

 

[mister_rf]

See this example:


By the way, use only one resistor for R3&R4… :-D

 

[mister_rf]

You can always readjust some wiring. :smile:
And maybe it’s better to have a capacitor connected to GND at pin5 of the U4. A standard value between 10nF and 22nF. See the modified diagram.

 

[keith1200rs]

It would be worthwhile running the ERC on the schematic & DRC on the layout.

Orhtogonal lines for wires make schematics easier to read.

Personally I prefer to make explicit power connections to ICs so I would invoke the power connections of U2 and connect them to power & ground.

Keith.

 

[mister_rf]

On the other hand, I have started to play only for 5 minutes, but for a good layout need more time to spend, and it’s more difficult to rearrange someone project, maybe for a small schematic like this it’s better to start from the scratch, also because some of the capacitors packages need to be changed in order to accept large volume for. That’s a job to do in many steps, with lot of patience and multiple versions on the run.



**broken link removed**

 

[keith1200rs]

I think the problem with the original layout (other than the tracks were far too thin) was the component placement. As mister_rf has done, re-arranging the components makes the routing far better.

Keith.

 

[mister_rf]

Working in small steps you can squeeze the layout, see:

 

[Qwme5]

guys i really dont know what to say thank u very much specially mister_rf i cant found any word to express my gratitude to u

i am right working in the last board u have upload it to me which is V5

thanks alot all of u

My Regards

---------- Post added at 00:35 ---------- Previous post was at 00:23 ----------

after checking the board it seems that u forget to connect the 5V to the RS232 and the Monostable

---------- Post added at 00:39 ---------- Previous post was at 00:35 ----------

 

[keith1200rs]

There is an airwire on Q1 base but 5V seems connected.

As I mentioned before, you really need to run the ERC on the schematic - it would point out the drawing errors you have.

You also have some unnecessary junctions in quite a few places - round Q1, Q2, D6, D7, U2C, R2 & D4.

Keith.

 

[mister_rf]

It’s not my mistake… ;-) Yes, I didn’t check all details, but you forgot to put in in the first place. Anyway, give me some minutes, I’ll do all necessary corrections. If you are happy with this just press ''thumbs up'' button. :-D

 

[Qwme5]

i really dont know what to say thank u verrrry much all of u guys

 

[mister_rf]

So, and a final version, not the best, only the latest release. For any problems you get your money back. :-D

 

[Qwme5]

sorry mister_rf i found another mistakes and i correct them all now am doing the board again can u take a look and tell how am going till now

 

[Qwme5]

mmm i have connect almost everything but there still some wires i dont know how to connect them can u plz see this board

 

[mister_rf]

Let’s see what are ‘’the problems’’ in the modified schematics.

1. Need to have this capacitor, If you don’t want it, simply don’t use it.
2. I have changed only order of the gates, no problem of the design functionality.
3. I have changed the package for this capacitor

 

[mister_rf]

4. No need for R3, R3||R4, so use only R4, you can choose later the correct value
5. Not important if R2D4 connected to ‘’12V’’ instead of ‘’5V’’.
6. Not important if R8 connected to the 12V instead to the 5V power supply.

 

[mister_rf]

And in my opinion you may need to use an external power supply, so I have placed just in case an external board connector plus one diode. See the PCB board attached.

 

[Qwme5]

Mister_rf i really cant find the appropriate words to thank u
thank u very much u helped me so much

 

[mister_rf]

By the way in this application, try to replace 1N4001 series diodes with some fast switching diodes series like BA157/BA159/ UF1001/UF1002/UF4002/UF4004 or some schottky diodes.

 

[Qwme5]

i have one another question right now am working on another project and i want to make a double layer PCB using eagle how can i do this