Conductive 'Shielding' Paint - Page 1
Forum section: electronics / general

author: Sionyn
author_rank: Frequent Contributor
timestamp: June 25, 2012, 09:12:19 pm
content: seems about as effective as those microwave this idiots tin foil shieldhttp://www.stewmac.com/shop/Electronics,_pickups/Supplies:_Shielding/Conductive_Shielding_Paint.html

author: JohnS_AZ
author_rank: Frequent Contributor
timestamp: June 25, 2012, 09:21:43 pm
content: Can't speak for that stuff specifically, but there are conductive paints out there that really do work. Most contain silver, and are pretty brutally expensive. (The coating also has to be provided with a path to ground)The insides of old VT-100 terminals and the like were coated with it.

author: G7PSK
author_rank: Super Contributor
timestamp: June 25, 2012, 09:37:22 pm
content: I have seen such material used inside plastic case radios usually some form of aluminium paint sprayed on.

author: Hypernova
author_rank: Unknown
timestamp: June 26, 2012, 01:26:03 pm
content: I've seen people use them to to make vias if you are making your own boards. As long as you are dealing with digital signals only the higher than proper resistance won't matter.

author: senso
author_rank: Frequent Contributor
timestamp: June 27, 2012, 12:08:22 am
content: All laptops that I have taked apart have some sort of cooper painting inside all the cases, connected via springs to chunky ground planes in the pcb.

author: siliconmix
author_rank: Frequent Contributor
timestamp: June 27, 2012, 06:47:09 am
content: a reasonably priced conductive paint would be award winning

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: June 27, 2012, 08:18:32 am
content: These guys sell a carbon based conductive paint - not as conductive as silver but way cheaper.http://bareconductive.com/

author: G7PSK
author_rank: Super Contributor
timestamp: June 27, 2012, 09:04:07 am
content: These people do a reasonably priced carbon based paint in tins fro 125ml to 500ml.http://www.tonetechluthiersupplies.co.uk/guitar-paint-and-lacquer/conductive-paint/conductive-shielding-paint.html

author: T4P
author_rank: Super Contributor
timestamp: June 27, 2012, 05:40:56 pm
content: Conductive shielding paints are regularly used by some guitarists for painting the innards of their guitars ...http://www.guitarnuts.com/wiring/shielding/shield3.phpIt's insane

author: Time
author_rank: Frequent Contributor
timestamp: June 27, 2012, 05:49:55 pm
content: You can assume the metal based paints just have prices proportional to the market price of the metal. Im sure thats where all the cost is.

author: SeanB
author_rank: Super Contributor
timestamp: June 27, 2012, 06:33:08 pm
content: More likely they are sniffing the solvents when making the price point. The graphite ones are expensive, and carbon is pretty common and easy to get. Powder might be difficult if you do not have a ball mill, but even so charcoal is cheap.

author: siliconmix
author_rank: Frequent Contributor
timestamp: June 27, 2012, 06:50:07 pm
content: Quote from: DaveXRQ on June 27, 2012, 05:40:56 pmeven for guitars that are humbucking ?

author: T4P
author_rank: Super Contributor
timestamp: June 27, 2012, 07:24:57 pm
content: Quote from: siliconmix on June 27, 2012, 06:50:07 pmYes! Exactly...

author: ampdoctor
author_rank: Frequent Contributor
timestamp: June 27, 2012, 09:59:03 pm
content: Can't speak for conductive paint, but when I use copper leaf for shielding it makes a significant difference. Conductive paint MIGHT work as has been mentioned given that there's enough solids in it and it's got some sort of decent connection to ground. That's the trick though. If you use a star washer to keep the controls from spinning, I would think it'd bite through the paint and into the wood making the connection iffy at best. And I wouldn't trust anything stewmac says any farther than I could throw them. They specialize in over priced snake oil.

author: hun_yeti
author_rank: Contributor
timestamp: June 28, 2012, 07:06:43 am
content: most of the more expensive modern guitars have shielding paint in there cavity.tough my 800$ Les Paul does not have conductive painting, but my KoreanIbanez has conductive painting inside the cavity.you really need shielding, because of the very high impedancebut it does not make a difference if it is tin foil or aluminium tape or conductive paint

author: T4P
author_rank: Super Contributor
timestamp: June 28, 2012, 07:24:00 am
content: Oh 1 meg is high? How about 1gigohms :<If there's noise it's because of your single ended amp >:

author: siliconmix
author_rank: Frequent Contributor
timestamp: June 28, 2012, 07:28:35 am
content: Quote from: hun_yeti on June 28, 2012, 07:06:43 amare the strings on th les paul earthed ?

author: hun_yeti
author_rank: Contributor
timestamp: June 28, 2012, 11:58:54 am
content: yes, the strings are earthed, but if you release the string the noise level rises, also it can result in audible clicks and pops every time you touch/release the string, my guess is that is because of the relative huge change in the size/ capacitance of the ground plane.but after shielding all the electronics these problems diminish to a negligible amount.also the guitar is a little bit different then regular audio, because the noise is usually exaggerated due the usually heavy processing like compression , distortion and heavy EQ.I was also thinking on putting a differential preamp under the pickup and buffer it to make a near zero ohm output, but I haven't got too much time to work this idea out, and I'm not smart enough to pull out a working circuit from behind my ears.I know that humbucker pickups work on the principal of CMR and I wonder how much difference would and active differential input would make.

author: siliconmix
author_rank: Frequent Contributor
timestamp: June 28, 2012, 12:04:14 pm
content: do you get distortion if you keep your forearm/palm on the bridge while releasing the strings ?

author: hun_yeti
author_rank: Contributor
timestamp: June 28, 2012, 12:29:20 pm
content: I think you misunderstood me :-)I don't have any problems now, that was just the state of it when I bought it. (and it didn't even had frets so it was quite the work to restore it to a usable state)but of course if you keep at least one contact with the strings you don't get any noise or clicks (it's not distortion just noise, nothing unusual, it is the same for every cheap / guitar.)

author: siliconmix
author_rank: Frequent Contributor
timestamp: June 28, 2012, 12:42:50 pm
content: Quote from: hun_yeti on June 28, 2012, 12:29:20 pmsorry misunderstood

author: free_electron
author_rank: Super Contributor
timestamp: June 28, 2012, 06:14:34 pm
content: Quote from: senso on June 27, 2012, 12:08:22 amthat stuff inside laptops is NOT paint... they vacuum deposit that or it is sputtered on...no solvents involved. just a high voltage arc.