Numbering Parts In A Schematic - R1, R2, etc.

[bwanasonic]

I like to use ExpressSCH in conjunction with ExpressPCB to help me idiotproof my layouts. This requires me to #number the components, and I usually just go from left to right and number them. Is there some sort of accepted practice for this? BTW- What got me thinking about this is the new Thunderchief schem posted at Runoffgroove.

Kerry M

[petemoore]

From what I can gather by comparing these schems with #d parts, it looks like mainly a way to help with discussion, so the accopmanying text is easily related to the drawing for analysis.
 There may be some 'givens' for a Fuzz Face [or other 'common' sircuit]say because of the technology of article by RG, but having the text with at least most of the values seems is needed to use a drawing.

[Peter Snowberg]

There are no hard and fast rules about this at all. Number things as you like with the one restriction that every number is unique.

I generally number from input towards output.

You can also number according to "series" as well. Example... resistors in signal chain get Rxx, resistors providing pull to V+ get R1xx, resistors providing pulls to ground get R2xx.

Whatever makes it easiest for you is the best way to go.

Take care,
-Peter

[Paul Perry (Frostwave)]

It isn't so simple if you are manufacturing, and have the numbers screened on the board. For assembly & repair, it is useful to have R1 next to R2 and so on, but that might mean that the numbering is jumping all over the schematic, and vice versa.
Also, for assembly purposes, you might want the five 100K resistors to be sequential. Your choice!