Circuit Diagram Rules


Circuit Diagram Rules - rules and guidelines for drawing good schematics ask question 261 255 the question is what are the rules and guidelines for drawing good schematics note this is about schematics themselves not about the circuits they either the proper formal rules for describing the circuit are followed and the circuit is correctly defined or it p div div class b algotextcarousel id ce carousel 1779941415 2 div id slideexp1 7697c9c class b slideexp data wire i slideexp init b select i f selected o f active o data control id slideexp1 7697c9 data appns serp data k 5397 1 data stk div class b overlay div id slideexp1 7697c9chevrons prevbtn class btn disabled prev rounded bld data dir div class bg span span div div class vcac div style height 32px margin top 16px div class cr div div div div div div div id slideexp1 7697c9chevrons nextbtn class btn disabled next rounded bld data dir div class bg span span div.
div class vcac div style height 32px margin top 16px div class cr div div div div div div div div class b viewport div class b slidebar id slideexp1 7697c9 role list aria label please use arrow keys to navigate div class slide data dataurl data rinterval data appns serp data k 5390 1 tabindex 0 role listitem a href https electronics stackexchange a 28255 h id serp 5389 1 div class b insideslide div class b text a schematic is a visual representation of a circuit as such its purpose is to municate a circuit to someone else a schematic in a special puter program for that purpose is also a machine readable description of the circuit this use is easy to judge in absolute terms either the proper formal rules for describing the circuit are followed and the circuit is correctly defined or it isn t since there are hard rules for that and the result can be judged by machine this isn t the point.
of the discussion here this discussion is about rules guidelines and suggestions for good schematics for the first purpose which is to municate a circuit to a human good and bad will be judged here in that context since a schematic is to municate information a good schematic does this quickly clearly and with low chance of misunderstanding it is necessary but far from sufficient for a schematic to be correct if a schematic is likely to mislead a human observer it is a bad schematic whether you can eventually show that after due deciphering it was in fact correct the point is clarity a technically correct but obfuscated schematic is still a bad schematic some people have their own silly ass opinions but here are the rules actually you ll probably notice broad agreement between experienced people on most of the important points use ponent designators this is pretty much automatic with.
any schematic capture program but we still often see schematics here without them if you draw your schematic on a napkin and then scan it make sure to add ponent designators these make the circuit much easier to talk about i have skipped over questions when schematics didn t have ponent designators because i didn t feel like bothering with the second 10 k resistor from the left by the top pushbutton it s a lot easier to say r1 r5 q7 etc clean up text placement schematic programs generally plunk down part names and values based on a generic part definition this means they often end up in inconvenient places in the schematic when other parts are placed nearby fix it that s part of the job of drawing a schematic some schematic capture programs make this easier than others in eagle for ex le unfortunately there can only be one symbol for a part some parts are monly placed in different orientations.
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