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conductive ink

MrDEB

Well-Known Member
Has anyone used this conductive ink?
I am designing a small lightweight project that just has 1 red LED 1 smd resistor, a motion detector switch, and a small coin cell battery,
I was planning on drawing a circuit using conductive ink on plexiglass.
 

ChrisP58

Well-Known Member
Most Helpful Member
Has anyone used this conductive ink?
I am designing a small lightweight project that just has 1 red LED 1 smd resistor, a motion detector switch, and a small coin cell battery,
I was planning on drawing a circuit using conductive ink on plexiglass.
How are you planning to attach the components? I doubt that the plexiglass will stand up to soldering temperatures.
 

MrDEB

Well-Known Member
The only components are 1-LED, 1_smd resistor, 1-coin cell battery, and 1-motion sensor switch.
Planning on using some adhesive-backed copper foil folded over at the ends to contact the conductive ink.
Using super glue to adhere all the components.
Should work after testing.
Battery contacts are copper foil glued to 2 plastic pieces with a 3mm spacer glued as a spacer. Battery is sandwiched between.
 

alec_t

Well-Known Member
Most Helpful Member
Planning on using some adhesive-backed copper foil folded over at the ends to contact the conductive ink.
Won't that put the adhesive (not copper) in contact with the ink?
For such a simple circuit you could use a scrap of ordinary copper-clad board with the copper scratched away where not wanted.
 

MrDEB

Well-Known Member
this project is for earrings that light up.
bending over the ends of the foil, then gluing just the edges should work hopefully.
 

alec_t

Well-Known Member
Most Helpful Member
this project is for earrings that light up.
Ahh. Now the plexiglass use makes sense.
Direct wiring between components might be a more reliable alternative to conductive ink?
 

alec_t

Well-Known Member
Most Helpful Member
You could use much finer wire than 30g. Even something like 47g (which is almost invisible !)
 

ChrisP58

Well-Known Member
Most Helpful Member
The issue with using 30g wire is maybe its thickness. Not sure
If you're only running a few milliamps, then 30 gauge is fine.

I would also change the resistor from SMD to an 1/8W leaded axial part. Two fewer solder joints to make since the wires are already attached. Same for the LED.
 

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