The order of soldering parts! (With Pics)

Started by jeroen_verbeeck, October 01, 2004, 05:36:36 PM

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jeroen_verbeeck

Hi,

This is probaby a lame question, but I have to know before screwing up.
I'll document it with pictures to make it clear.

These are the 4 sittuations:

1              2

3              4

As you can see, these are all sittuations where 2 or 3 parts come together.
Now my question is, can I put these parts all in the same hole, or do they really need the space between them ?
Can you maybe explain why I can put them together or why not ?

Thanks in advance,
Jeroen

Jason Stout

QuoteNow my question is, can I put these parts all in the same hole
Yes, the reason being a circuit board trace is nothing more than a flat wire.
Edit: Examples of different building techniques.

http://www.geofex.com/Article_Folders/protostyles/proto_styles.htm
Jason Stout

Marcos - Munky

The board only connect the parts. You can put them in the same hole, do a direct solder in the legs of both parts, and any way that connect them together.

vanhansen

Even though you could, why would you want to?  What if you need or want to replace one of those parts?  You'd end up de-soldering all of them and risking messing up more than one of them.  It's easier to desolder one and replace it than three (and cheaper).

And correct me if I'm wrong, but the traces not only connect the parts together, they also provide the order in which the signal travels, right?
Erik

Mike Burgundy

If, however, youre using heat-sensitive components, you might end up in a lot of trouble having to heat up that humungous blob of solder and leads. Plus, it's neater when you give each component it's own pad. This is why a lot of people prefer to. There's actually also a certain mechanical consideration - if the hole is *really* large, it won't support the components well, even if you really crap a lot of leads in there.
hih

jeroen_verbeeck

Quote from: vanhansen
And correct me if I'm wrong, but the traces not only connect the parts together, they also provide the order in which the signal travels, right?

That whas kinda what I meant,
look at pic 2 and 4.
Does it mess up the signal order if you connect the 3 of them in 1 hole ?

Mike Burgundy

Traces only determine what connects to what. Electrically, if you have one trace connecting C1 to C2 to R1 to R2, all the components know is that theyre connected. Wether, when following that specific trace from left to right, you encounter R1/C1/R2/C2 (just ONE leg per component connects, 'kay?), or R2/C1/C2/R1 or whatever does not matter in this sense. It may, when youre dealing with EM problems, noise, other kinds of trouble, but in a perfect world and purely electronically speaking it doesn't matter at all. if you connect the "output" pin of a resistor to a cap to ground, and later on another resistor, the signal for all intents and purposes hits both components at the same time, even if they're yards apart. Light speed is impressive.

jeroen_verbeeck

Thanks Mike,
Your a life saver!
And everyone who replied to.

Thanks

petemoore

Modern wires and connections devices like traces and leads are such low resistance that it's moot, until you start getting into really long lengths, no reason for that in a Stompbox.
  But how they're laid out can, neat layout, avoiding input and output wires running along each other...uh without going into deep typing about oscillation/noise...keeping the layout tight and linear may help reduce noise in some [especially high gain] circuits.
  I eliminated some tick from a Phaze 90...shortened long wires, got it's own box...the tick seems to have almost disappeared...very faint now....er at least I think that's why...
Convention creates following, following creates convention.

bwanasonic

All part leads connected with the same trace are part of a net, and electrically are equivalent to having all the leads twisted together. In general though, I think *one lead, one hole* is probably your best bet. If you are doing it for space saving, there are better ways. If you are doing it to avoid drilling holes, then I don't blame you :lol:  That's the part of PCB building that put me off the most, and the main reason I'm willing to pay to have my boards made.

Kerry M

Mike Burgundy

I actually like the odd half hour for a stack of pcb's with a handheld drill, on my balcony, in the sun. "Course, this goes for summer, only ;)