Which components are "order specific" in a schem/layout?

[tweaked]

Using this schematic for reference: http://www.geofex.com/Article_Folders/TStech/tsxtech.gif

Which components are "order specific"? For instance, am I right that it doesn't matter where the 51p cap in the clipping section goes, as long as it's between pin 1 and 2 of the ic? What I mean is, it doesn't have to be the first thing connecting pins 1 and 2 right? You can put the first diode, then the cap, then the next diode if you want?

What about the 51k resistor in the clipping stage? Could you make that the first thing off pin 2 of the ic and then do your cap and diodes as they lay in the schem?

[heyniceguy]

it does not matter. electricity just isnt that picky. the resistance within traces isnt nearly enough to make a difference. but...

when soldering up a board, its best to start with the most "hardy" components first, those that will not be damaged as badly by continued application of heat. a good rule of thumb for soldering order is:

1) IC sockets
2) jumpers on board
3) off board wiring
4) pots on board/trimpots
5) resistors
6) Caps
7) diodes
Trannies and IC's

[tweaked]

it does not matter. electricity just isnt that picky. the resistance within traces isnt nearly enough to make a difference. but...

when soldering up a board, its best to start with the most "hardy" components first, those that will not be damaged as badly by continued application of heat. a good rule of thumb for soldering order is:

1) IC sockets
2) jumpers on board
3) off board wiring
4) pots on board/trimpots
5) resistors
6) Caps
7) diodes
Trannies and IC's

Thanks but I'm not talking about the order in which they are placed on the board. I'm talking about order in reference to converting a schematic to a layout. For instance the case above where the cap is shown as the first thing between pins 1 and 2 on the schem but I believe it can be placed after the diodes (all of which must connect pins 1 and 2.)

[JimRayden]

Thanks but I'm not talking about the order in which they are placed on the board. I'm talking about order in reference to converting a schematic to a layout. For instance the case above where the cap is shown as the first thing between pins 1 and 2 on the schem but I believe it can be placed after the diodes (all of which must connect pins 1 and 2.)

That's what the first paragraph of the previous post was about. It does not matter as long as they are electrically connected.

-----------
Jimbo

[tweaked]

That's what the first paragraph of the previous post was about. It does not matter as long as they are electrically connected.

-----------
Jimbo

ok but is this true for all components and sections? for instance:

1. in the power section, could you get 4.5v from a point between the 47uF cap and ground? or must that connection come from between the two 10k resistors only?

2. in the output buffer, can you put the 10k resistor to ground in-between Rb and the cap? or must it come between Q2 and Rb as shown?

[Seljer]

Look up series and parallel circuits http://en.wikipedia.org/wiki/Series_and_parallel_circuits

the first example in that circuit you gave is a parallel setup, and like allready mentioned, it doesn't really matter as long as they're all connected, theres no real "order" to speak about, its just their physical location on where you put them (you just have to connect the right)

the other case in which order would not matter is if you had a line of components wired in series, with nothing else shooting off (eg: a resistor, diode and a cap in series is the same, even if its cap then resistor then diode..... just watch out the polarity on the diode, and possible the cap)
in the tubescreamer this would be that 4k7 and 0.047uF cap that go to ground from pin2 out of the opamp. Or the 1k and 0.02uF on the input


in prettymuch any other case order of things DOES matter

[Doug_H]

All of them! If you don't order the specific components, your circuit probably won't work...

BWAHAHAHA!!!

I'm here all week folks...

[JimRayden]

All of them! If you don't order the specific components, your circuit probably won't work...

BWAHAHAHA!!!

I'm here all week folks...

...he slips behind the curtain, leaving the crowd cheering for more.

---------
Jimbo

[slacker]

ok but is this true for all components and sections? for instance:

1. in the power section, could you get 4.5v from a point between the 47uF cap and ground? or must that connection come from between the two 10k resistors only?

4.5 volts comes from junction of the 2 10k resistors, you won't get 4.5volts from any other point. The resistors don't need to be physically joined at one point when you do a layout though. You could have the first resistor in one corner of the board and a trace running all over the place to the second resistor and you'd have 4.5volts any where along that trace. So long as the connection goes +9 > 10k > 10k > ground thats all that matters.

2. in the output buffer, can you put the 10k resistor to ground in-between Rb and the cap? or must it come between Q2 and Rb as shown?

You could do that and it might even work but it wouldn't be the same as the schematic.

[d95err]

Which components are "order specific"? For instance, am I right that it doesn't matter where the 51p cap in the clipping section goes, as long as it's between pin 1 and 2 of the ic? What I mean is, it doesn't have to be the first thing connecting pins 1 and 2 right? You can put the first diode, then the cap, then the next diode if you want?

In theory, a trace does not have any physical extension, it is treated a single point. There is no above, below, in front or behind. In theory, there is no such thing as component "order".

In practice, copper traces have a tiny bit of resistance, capacitance, inductance etc. These values are usually so small that they can be ignored. There are some exceptions. Those usually involves high voltages, high currents, high frequencies or very long traces.

For instance, a perfect guitar cable would produce a perfect signal regardless if it was one foot or 100 miles long. In practice, cables have resistance and capacitance that can be big enough to cause tone loss if they are long enough (or bad quality).

Another example is input grid resistors in high-gain tube amps. You want to solder these as physically close to the actual tube as possible to prevent radio interference or oscillations to "sneak in" between the resistor and the tube grid.