Etched Fabric Speaker
Similar to the paper speakers these copper fabric speakers are created by etching the copper off the fabric in order to create a coil. If you then run a 5-9V amplified sound signal through this coil and hold a magnet close to the center of the coil then it will make sound. Unlike most speakers that have the wire coil wrapped cylindrically and placed around the magnet, here the coil is in the plane and directly part of the membrane that moves the air creating sound.
For more details please see the paper speaker post:
>> http://web.media.mit.edu/~plusea/?p=265
Using masking tape to mask both sides of the areas you want to etch away. Then apply Vaseline to the exposed areas (both sides!).
Carefully peel away the masking tape, without smearing the Vaseline everywhere.
Submerge in a bath of salt (1 tablespoon) and distilled vinegar (1 cup), proportions are rough. Let sit for anywhere between 4 and 12 hours. As the copper dissolves in the acid it creates Copper Sulfate. Don’t drink! And don’t dispose of but use for future etching! Ultimately dispose of it safely.
When the copper has etched away, rinse thoroughly and then iron between two paper towels to remove remaining Vaseline.
Other fabric/thread versions
conductive fabric on canvas (good), stainless steel thread on canvas (okay)
Stainless steel thread between masking tape (okay), stitched to paper (bad)
I’d personally favor Google. Both FB and Google would benefit from it, but we would likely benefit more from Google taking it over. In the case of Google+ it is just a matter of time. Facebook was lucky it didn’t definitely really have to compete with something as “good” as facebook, the competition was just lacking a lot of features and a global approach.Google+ is excellent to Facebook, nevertheless it has a bigger challenge to obtain popular.Just have a look at VHS and Betamax. Betamax was better but lost due to bad marketing/licensing.Danny recently posted..Black & Decker NPP2018 18-Volt Cordless Electric Pole Chain Saw
I speculate if Honda and Toyota’s (in reality all Japanese cars) income will likely be significantly affected by each of the anti-Japanese demonstrations. Most likely a lot of car buyers will acquire a Korean, Chinese, American or European car since they may well dread their investment may possibly attract unneeded attention. Guess we will find out within a calendar year from now. Continue to keep up the nice work!