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Topic: Crossover component (Read 342 times) previous topic - next topic

LarryD

Aug 24, 2014, 12:03 am Last Edit: Aug 24, 2014, 06:04 am by LarryD Reason: 1
Make your own crossover component, see images:
#1   cut 1 more piece of Nylon/Kapton tape  than the number of wires involved.
       (I use uninsulated 30AWG wire wrap wire)
#2   layout the first wire to lead spacing needed
#3   cover the first wire with a piece of tape with the carrier removed
#4   repeat with the second wire
#5   complete all wires until you are finished
#6   form the wires and cut to length, I usually leave 1/10" overhang
#7   take off the protector of the first piece of tape and stick to PCB.  Solder in place
#8   a sample of a simple X (crossover) component (full size)

EDIT:
If you want, you can cover the crossover component with hot glue.
Use freeze mist to cool glue down immediately.
The way you have it in your schematic isn't the same as how you have it wired up!

Henry_Best

You're for it now! Your fingerprint is on the internet   ;)

LarryD

#2
Aug 24, 2014, 04:35 am Last Edit: Aug 24, 2014, 06:11 am by LarryD Reason: 1
OOPS    :smiley-roll-sweat:
The way you have it in your schematic isn't the same as how you have it wired up!

LarryD

You could make a jig:
The way you have it in your schematic isn't the same as how you have it wired up!

Cactusface

Hi All,
              I must have my silly head on today!! I just don't see the point of it??   Please explain.

Regards

Mel.
Open your mind! But not too far, your brains might fall out.
Also like Photography, model building and my 300+ Cacti and Succs.

LarryD

#5
Aug 24, 2014, 11:04 pm Last Edit: Aug 24, 2014, 11:07 pm by LarryD Reason: 1
There are times when making single sided boards that you may want to avoid multiple jumpers since some I.C.s. don't go just Pin 1 to Pin 1 etc.  

This is not the best example, however, consider the simple crossover component on my finger tip (with no finger print).
If I.C. X pin 1 goes to I.C. Y pin 2 and I.C. X pin 2 goes to I.C. Y pin 1, the crossover could be placed in-between the two I.C.s to accomplish this.

I would solder the crossover component on the foil side, just like a SMD resistor would be soldered.

Therefore the crossover component on the foil side contains the jumper(s) within itself.

The way you have it in your schematic isn't the same as how you have it wired up!

Cactusface

#6
Aug 25, 2014, 09:56 am Last Edit: Aug 25, 2014, 10:00 am by Cactusface Reason: 1
Hi,
        I find wire-wrapping a lot easier! and less fiddly! as long as your not talking high currents, etc, but they would I hope be tracked on the PCB...

Regards

Mel.
Open your mind! But not too far, your brains might fall out.
Also like Photography, model building and my 300+ Cacti and Succs.

tylernt

Great thread! The insulation gets soft on my crossovers during soldering, which can lead to a short. I like this solution.

Sometimes you have a crossover on the same chip too -- like the two VCC/GNDs reversed on each row of the 28-PDIP ATMega328PU.

LarryD

I'll find out the manufacture of the nylon tape and report back.
The way you have it in your schematic isn't the same as how you have it wired up!

LarryD

Its not nylon tape its UHMW tape.
http://www.leevalley.com/en/wood/page.aspx?p=32182&cat=1,110,43466,32182

Kapton tape is also a good choice but not as sticky.


The way you have it in your schematic isn't the same as how you have it wired up!

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