How do you design a PCB on a design software?
How do you know "which resistor" to chose, "which cap" to chose, "which microcontroller" to chose etc?
I could definitely draw a nice schematics , of course, I been learning a lot of tutorials online for EAGLE, Altium Designer etc. But in all these tutorials I see engineers saying
"ok , i am gonna go with this resistor here and put it here" How do they know which resistor to chose and also where to put it , Are they creating these schematics on the top of their head? Isn't that a bit too much? If that's not the case then are senior engineers giving them "drawings on a piece of paper in pencil or something" and telling them to draw it on a pcb software?
I am confused. I graduated 3 years ago and I am not sure exactly what goes on before the schematics are layed out on the software , like where they get the information and values and models of the components??
The design and prototyping are completed first which determines the values of all of the components. Once a prototype is approved as the production model the schematic is entered into electronic CAD software such as PC AD which has the ability to produce a rough PCB layout from the schematic which will need tweaking. The final PCB layout will be affected by factors such as radio frequency interference and immunity, component size and availability, and ease of manufacture. These factors will require the adjustment of PCB track paths and lengths, number of ground planes and power planes etc.
Manual routing in DipTrace PCB Layout
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