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moody
Mad Scientist
USA
326 Posts |
 Posted - Jul 25 2004 : 3:02:17 PM
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it was 460vac sorry
im typing on my new dell axim PDA and its easy to mess up
David S |
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binaryblade
Apprentice
Canada
136 Posts |
Posted - Aug 08 2004 : 01:30:35 AM
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Well compared to some of you guys my exploits seem somewhat pitiful and I should mention that both these occured in elementary school when I just knew enough to be dangerous.
1. I decided to wire a walkie talkie to a wall outlet my reasoning electricicty comes from the outlet and the walkie needs electricity to run and I don't have a 9v needless to say the concepts of voltage, current and the differences between AC and DC escaped me at the age of 7. there wasn't much of an explosion however the upstairs of myhouse was quite well hidden in smoke.
2. This one happened a few years later and is probably one of the dumbest things I've done to date: It all started with an electrolysis experiment separating water anyway I did it in to a sealed milk jug which I had inserted electrodes through the side. after a day or so I decided that I shoud see if any hydrogen was produced and concluded that since the bubble were miniscule the easiest way to see if there was gas would be to flame test and if the flame was brighter there was hydrogen I vaugely remember reading a test for hydrogen in that manner. what happened when I put the lighter over it it when out nearest I can figure now is from lack or oxygen due to the hydrogen escaping first. so there I am playing russian roulette with clip loading pistol and I decide to light the lighter again. this time the mix was more favourable to combustion. the jug exploded in my face and plastic shrapnel and water went flying. the bolts I was using as electrodes left some pretty nice dents in the wall of my closet (which I had converted into a workbench).
Suddenly I realized that I like most of humanity only know enough to be dangerous.
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MC BOB
Apprentice
Australia
95 Posts |
Posted - Jun 07 2005 : 05:28:36 AM
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I know im really late to join this forum, but these are funny.
1. I was the Apprentice Sound Techie at my schools production earlier this year. On the third night, our principal and his "VIP" guests arrived early, so we were not allowed to do a sound test. So, we started the show, not knowing that radio mic 5, 7 and 8 levels were way to high on the band foldbacks. Right were the cast comes out. John the Baptist sings his song, dances a bit and here comes the cast. The feedback started low at first, but then climbed to a level that i felt 50-100 metres away. Our inline compressors literally chucked a spas and the whole system clipped. Everyone has heard feedback, but when it is over 4 15inch subs, 4 12inch wides, 4 15inch wides and uncountable piezos, It gets loud. 3000wrms feedback is not fun. Believe me.
2. We had a 2000w spotlight on far left wing duty. Anyway, it was hella old and had no globe, so we ordered in a new one. It arrived the night before the show started, so we gave it a test run, but the iris was jammed. So our Sound Tech came over and said that the best way to turn it off was to point it up. Chris pointed it up and *BLAM*!!!! The globe blew and shards of glass flew out the vents in the side of the spottie. Our Sound Tech was deaf for a few mins.
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wasssup1990
Nobel Prize Winner
A Land Down Under
2261 Posts |
Posted - Jun 07 2005 : 06:11:28 AM
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Oh my god!
That sounds like a fun week to me.
Hey if anyone's still interested in this topic, what's the biggest spark you've seen? I'll make myself more clear, I mean not long but BIG; a big fat spark.
The biggest fat spark i've seen was down in Gelong when my family was having lunch on the grass near the beach. Anyway some guy was trying to restore power or something because he had a pole a few meters long and was poking at something at the top of a power pole, maybe a heavy duty latch. I was looking at what he was doing very carefully because I was interested of coarse, then suddenly a HUGE spherical spark lit up the hole place breifly and made a huge bang at the top of the pole. The spark looked about 30cm diameter. No one was hurt and I was about 100m - 200m away from it. And the longest spark i've seen is probably up to 5 meters long.
I wonder if i've already posted this story somewhere else on this site. [d:]
If anyone hasn't heard already i'm making an 10-Band Equalizer it should be completed in about 1 more month. The PCBs are custom made and i've currently spent near up to $200 already on this project. If I have time I might ask Aaron to post all my designs on this site so all can see. This is not a promiss so don't get your hopes up. My equalizer will be built to a high standard and if someone else was going to make it they can make it cheaper; however this may alter performance and appearance. If you REALLY want to see my equalizer, don't be shy, just ask me and i'll put my progress right hear on this forum.
Good luck to all your future projects and experiments in 
J.C. |
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MC BOB
Apprentice
Australia
95 Posts |
Posted - Jun 07 2005 : 06:36:21 AM
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Awsome! 10-band E.Q! Where did u get the pcb from? I read ur post in the audio section (That canadian dude dropped u. soz) and it sounds pretty k3wl.
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wasssup1990
Nobel Prize Winner
A Land Down Under
2261 Posts |
Posted - Jun 07 2005 : 06:43:05 AM
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You mean John? He's the canadian dude.
The PCB had to be made from scratch by me becasue it didn't come with the schematic. It looks fully sick [(:]; and my current progress too. 3 tries and I have sucessfully made my first PCB from scratch. I've also altered the schematic a little bit to fit my needs.
J.C. |
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wasssup1990
Nobel Prize Winner
A Land Down Under
2261 Posts |
Posted - Jun 07 2005 : 06:46:03 AM
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Hey buddy where are you in Oz? I'm watching Rove at 9:30PM in our time zone. Just thought of mentioning that. I hope they're going to have 'flick your switch' on again.
J.C. |
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cirvin
Nobel Prize Winner
USA
1542 Posts |
Posted - Jun 07 2005 : 1:46:11 PM
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quote:
I know im really late to join this forum, but these are funny.
1. I was the Apprentice Sound Techie at my schools production earlier this year. On the third night, our principal and his "VIP" guests arrived early, so we were not allowed to do a sound test. So, we started the show, not knowing that radio mic 5, 7 and 8 levels were way to high on the band foldbacks. Right were the cast comes out. John the Baptist sings his song, dances a bit and here comes the cast. The feedback started low at first, but then climbed to a level that i felt 50-100 metres away. Our inline compressors literally chucked a spas and the whole system clipped. Everyone has heard feedback, but when it is over 4 15inch subs, 4 12inch wides, 4 15inch wides and uncountable piezos, It gets loud. 3000wrms feedback is not fun. Believe me.
2. We had a 2000w spotlight on far left wing duty. Anyway, it was hella old and had no globe, so we ordered in a new one. It arrived the night before the show started, so we gave it a test run, but the iris was jammed. So our Sound Tech came over and said that the best way to turn it off was to point it up. Chris pointed it up and *BLAM*!!!! The globe blew and shards of glass flew out the vents in the side of the spottie. Our Sound Tech was deaf for a few mins.
Reminds me of our production. Our school had just recived an all new audiotorium and equptment, so there where a few bugs to work out. Over the weeks of rehersal, 2 of our really nice rack mount wireless mic recivers died. The day before opening night, we did a small promo for the school. The lead actress' mic died. Luckily i was aboe to pick her up with the other actor's mics and Mr. Howard had the floor mics. It's in my nature to fix stuff like that immediately, so I begin tinkering with the controls. I pull up her fader all the way up, and crank the gain, nothing happens. I give up and go back to doing what I was suppoed to be doing. Anyway, a couple minutes later, I had an idea. I reached over and smacked the reciver. It worked. Her signal came through. The bad part was, I had forgotten to bring the gain and fader down. Needless to say, it hurt. Luckily we had the limiters, and it wasn't over 120db, but it was startling.
I was proud I had fixed it. :p
http://daxter12.topcities.com <Updated 5/27/05 |
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Kale
Nobel Prize Winner
Canada
795 Posts |
Posted - Jun 07 2005 : 10:38:23 PM
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Here's a little one:
Gas tube lasers, like the ever popular HeNe laser, are basically large capacitors. There's two electrodes in a tube of gas. When you are done using the laser, and turn it off and unplug it, there's still a couple thousand volts on the electrodes inside the laser tube. If you touch the contacts on the power cord to anything, it will discharge. Optical workbenches are usually metal, so I make a point of discharging the prongs by grounding them out on it after I unplug a laser. You can generate some interesting sparks by bringing the contacts over to the table slowly. Just make sure there's nothing electrically connected to the table that you care about. Or that none of your coworkers are leaning on the table. (oops)
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MC BOB
Apprentice
Australia
95 Posts |
Posted - Jun 07 2005 : 11:40:32 PM
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Wassap1990, Im in twonsville, QLD. Rove's on at 9:30 as well up here. Where are you at?
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MC BOB
Apprentice
Australia
95 Posts |
Posted - Jun 07 2005 : 11:41:52 PM
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Sorry about that, im in TOWNSVILLE
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wasssup1990
Nobel Prize Winner
A Land Down Under
2261 Posts |
Posted - Jun 08 2005 : 02:22:15 AM
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All these stories are very interesting.
'MC BOB' I'm in Melbourne VIC as said in my profile.
I love queensland, it's probably been 2 years since I was their, but back in past we used to go their every 1-3 years. I've been to Brisbane, Coolangatta and the GOLD COAST; I love that city.
J.C. |
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Kale
Nobel Prize Winner
Canada
795 Posts |
Posted - Jun 08 2005 : 2:20:09 PM
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*sigh* I wish I had money to travel. I'd love to visit another Commonwealth country. (I'm in Canada)
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wasssup1990
Nobel Prize Winner
A Land Down Under
2261 Posts |
Posted - Jun 08 2005 : 9:34:27 PM
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Ya I hear ya.
I hope in the future i'll have enough $ to travel the world. 
I just finished my English exam about half an hour ago and i'm at home now, I need to go back later to do another exam. 
J.C. |
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BEatonNo1
Nobel Prize Winner
USA
1133 Posts |
Posted - Jun 09 2005 : 12:06:44 AM
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a couple of days ago I was gonna put a switch on this light thats out front of our shop (its in a really really old hangar). I didnt know what breaker it was on so i cut off the entire building. I then took my new linemans pliers and grabbed two wires and attemped to cut them but instead I got a bunch of sparks and my pliers were welded onto the metal box, they cant cut now either because all the metal that was in contact with the wire is gone.
the scary thing is that it turned out to be 220 3 phase that kept arcing untill i pulled them off.
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Largest explosion
