EEVblog Electronics Community Forum

Products => Crowd Funded Projects => Topic started by: Pat Pending on February 27, 2014, 10:49:02 pm

Title: "class action suit" - starter
Post by: Pat Pending on February 27, 2014, 10:49:02 pm
Some ideas are just plain DANGEROUS...

https://www.kickstarter.com/projects/excelphysics/the-arc-plasma-speaker?ref=discovery (https://www.kickstarter.com/projects/excelphysics/the-arc-plasma-speaker?ref=discovery)

Title: Re: "class action suit" - starter
Post by: sync on February 27, 2014, 11:09:31 pm
Does it have a CE marking?
Title: Re: "class action suit" - starter
Post by: Psi on February 27, 2014, 11:19:30 pm
Assuming his numbers of 30W typical input power and 30,000V output are correct, then it has to be < 1mA output current so isn't going to be killing people.
Probably less than 0.5mA due to efficiency of the HV powersupply.

However, with an open front like that lots of people will dare their friends to touch the arc.

"It doesn't hurt, honest"
Title: Re: "class action suit" - starter
Post by: jadew on February 27, 2014, 11:48:24 pm
However, with an open front like that lots of people will dare their friends to touch the arc.

Looking forward for the youtube videos! :D
Title: Re: "class action suit" - starter
Post by: Lightages on February 28, 2014, 06:51:28 pm
This is a very crude attempt. It looks ugly and will have very low output and no bass. It will be no better than a demonstration toy and that is all. I played with some of this in the 80s and it is entirely impractical to make a good sounding speaker from this technology. It produces ozone in its simplest form or consumes bottles of nitrogen or helium or other gases to prevent the production of poison ozone. Have a look at what has been tried and produced over the years:
https://www.google.ca/search?q=ionophone (https://www.google.ca/search?q=ionophone)
What they are offering is a fun toy but nothing else.
Title: Re: "class action suit" - starter
Post by: GiskardReventlov on February 28, 2014, 10:46:35 pm
it is entirely impractical to make a good sounding speaker from this technology.

They exceeded their target so I guess people want toys like this.  At first I wasn't sure if the crackling was due to the microphone or the device. But from what you say it sounds like the frequency range is within the microphone's range. Is that correct?

A large version might be fun for the haunted house and some Vincent Price vocals. Would be fun as a robot's speech output but maybe easier just to model the output and recreate algorithmically.
Title: Re: "class action suit" - starter
Post by: 8086 on February 28, 2014, 10:50:19 pm
This is a very crude attempt. It looks ugly and will have very low output and no bass. It will be no better than a demonstration toy and that is all.

Well yeah. The people buying don't give a shit how it sounds. It's a goddamn ARC PLASMA SPEAKER, man.  :scared:
Title: Re: "class action suit" - starter
Post by: dr.diesel on February 28, 2014, 10:56:11 pm
Wooden case, how many minutes of runtime till it bursts into flames?
Title: Re: "class action suit" - starter
Post by: Stonent on March 04, 2014, 12:20:03 am
This is a very crude attempt. It looks ugly and will have very low output and no bass. It will be no better than a demonstration toy and that is all.

Well yeah. The people buying don't give a shit how it sounds. It's a goddamn ARC PLASMA SPEAKER, man.  :scared:

Crowdfunded projects are frequently supported by people who can't google.
Title: Re: "class action suit" - starter
Post by: calexanian on March 06, 2014, 05:54:13 am
Wow.........   And it got funded!
Title: Re: "class action suit" - starter
Post by: Tinkerer on March 09, 2014, 06:13:48 pm
This is a very crude attempt. It looks ugly and will have very low output and no bass. It will be no better than a demonstration toy and that is all.

Well yeah. The people buying don't give a shit how it sounds. It's a goddamn ARC PLASMA SPEAKER, man.  :scared:

Crowdfunded projects are frequently supported by people who can't google.
Well I would have to say it depends on the project. A plasma speaker is something anyone can put together given a bit of effort(I have the parts to make one and will be doing so at some point) so the people funding this either dont google or dont care to make one themselves.
A crowdfunded project like Dave's ruler is certainly one you cant just get from google, nor is a project like the game Planetary Annihilation.(not that I assume you meant every project)

Anyway, things like this tend to impress people. When I was in college one of the people there was doing cold plasma in regards to medical applications. She was demonstrating to a group of people and some of them were more interested in the cool light show, rather than much else.(I think the question was asked about if she could make the light from it brighter or something)
Title: Re: "class action suit" - starter
Post by: uwezi on March 09, 2014, 08:14:53 pm
Does it have a CE marking?


Hardly - it will emit tons of electromagnetic interference. Try to attach it to your AM/FM radio  :palm:
Title: Re: "class action suit" - starter
Post by: NANDBlog on March 09, 2014, 08:25:30 pm
One IC, one mosfet, one transformer, bunch of wood and two screws from IKEA for 99. Must be worth it, right?
Title: Re: "class action suit" - starter
Post by: mamalala on March 11, 2014, 03:55:54 am
Uh ... I prefer my Revox Symbol-B. They work with a normal amp, have a real bass, etc...

Greetings,

Chris
Title: Re: "class action suit" - starter
Post by: mrflibble on March 11, 2014, 09:42:41 am
One IC, one mosfet, one transformer, bunch of wood and two screws from IKEA for 99. Must be worth it, right?
Maybe 9.90, for the novelty kit value. But pay 90 extra to avoid reading 3 google hits and building it yourself from whatever's in the parts box .... pass. Besides, there are easier ways to generate ozone from the comforts of your own poorly ventilated home. I'm sure I have an old laser printer in the parts box somewhere.