Review: 234/34 from Karlson Robotics January 2013

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RESISTANCE

  • hand sewn 8” trace has a resistance of 17 ohms
  • machine sewn top thread 8” trace has a resistance of 18 ohms
  • machine sewn bottom thread 8” trace has a resistance of 11 ohms

THREAD QUALITY

  • easy to thread a size 24 crewel needle
  • minimal fray and whisker
  • easy to sew by hand as well as machine
  • thread is wound on an industrial spool and has to be rewound on a bobbin for machine sewing

 
RECCOMENDATIONS

MANUFACTURER

 

Hand sewn LED circuit on cotton broad cloth with felt backing.
Positive and negative traces are 8 inches long.
SParkfun Conductive Thread Review with LED Circuit
 

Threads a crewel needle size 24 easily.
Jonh James Chenille Hand Sewing Needle Size 24
 

Hand sews a basic running stitch with few tangles or difficulties.
SParkfun Conductive Thread Review with LED Circuit
 

1.8mm blue LED with 4 tight loops around the LED leads.
SParkfun Conductive Thread Review with LED Circuit
 

 
Use a fresh 3V CR2032 battery to power the circuit.
LED glows = empirical evidence that the thread is conductive
SParkfun Conductive Thread Review with LED Circuit
 

This thread is corse and very hairy so that curls up on itself. The texture of the thread is very poor quality.
Conductive Thread Comparisons
 

Machine Stitching with a Schmetz Embroidery Needle 90/14
Schmetez Embroidery Needle for Berninia Home Sewing Machine
 

Machine stitching sample
top trace is Mitsifuji thread as top thread
bottom trace is Mitsifuji thread as bobbin thread
both methods sew smoothly without snags or fraying
Conductive Thread Comparisons
 

The reverse side of the machine sewing sample
Conductive Thread Comparisons
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