Arduino Forum

Using Arduino => General Electronics => Topic started by: larryd on Aug 24, 2014, 12:03 am

Title: Crossover component
Post by: larryd on Aug 24, 2014, 12:03 am
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.
(http://forum.arduino.cc/index.php?action=dlattach;topic=262714.0;attach=93552)
(http://forum.arduino.cc/index.php?action=dlattach;topic=262714.0;attach=93594)
Title: Re: Crossover component
Post by: Henry_Best on Aug 24, 2014, 04:05 am
You're for it now! Your fingerprint is on the internet   ;)
Title: Re: Crossover component
Post by: larryd on Aug 24, 2014, 04:35 am
OOPS    :smiley-roll-sweat:
Title: Re: Crossover component
Post by: larryd on Aug 24, 2014, 06:56 am
You could make a jig:

(http://forum.arduino.cc/index.php?action=dlattach;topic=262714.0;attach=93596)
Title: Re: Crossover component
Post by: Cactusface on Aug 24, 2014, 04:45 pm
Hi All,
              I must have my silly head on today!! I just don't see the point of it??   Please explain.

Regards

Mel.
Title: Re: Crossover component
Post by: larryd on Aug 24, 2014, 11:04 pm
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.

(http://forum.arduino.cc/index.php?action=dlattach;topic=262714.0;attach=93734)
Title: Re: Crossover component
Post by: Cactusface on Aug 25, 2014, 09:56 am
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.
Title: Re: Crossover component
Post by: tylernt on Aug 25, 2014, 10:38 pm
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.
Title: Re: Crossover component
Post by: larryd on Aug 25, 2014, 10:44 pm
I'll find out the manufacture of the nylon tape and report back.
Title: Re: Crossover component
Post by: larryd on Aug 26, 2014, 06:17 am
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.