stupid things we've done - diyAudio
Go Back   Home > Forums > Member Areas > The Lounge

The Lounge A place to talk about almost anything but politics and religion.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 18th July 2010, 11:35 AM   #1
diyAudio Member
 
Join Date: May 2010
Location: Where the world's best tea come from:Kericho Kenya
Default stupid things we've done

Lets face it:we all once did a stupid mistake which led to an injury.
Remember the first time you plugged in a soldering iron and went to take a **** then came back and grabbed the tip to feel if its hot enough?You will crack your ribs laughing at the kind of stuff one did when he was a newbe.
I once tryed soldering using an open fire on a windy day(yep!I can solder with fire and rod!).Well the rod had no insulation and was in the fire for quite some time.Without lifting my eyes from the pcb i was working on,i grabbed the rod.DAMN!!!It burnt into my palm like hell!It drew two lines on my palm and across my fingers.
Talk of experience and such 'accidents' should be included,including ignorance of safety precautions.So,how much 'experience' do you have in diy?
__________________
if there are no sparks,it probably doesn't work!
  Reply With Quote
Old 21st July 2010, 02:40 AM   #2
diyAudio Member
 
tubelab.com's Avatar
 
Join Date: Jul 2005
Location: West Virginia panhandle
In my 57 years on this planet I have performed far too many sensless acts of stupidity. Some have resulted in minor injury, but nothing major. There have been countless stupid electrical tricks starting when the paper clip met the wall outlet at age 5. My most memorable and embarrasing dumb blonde moment was not directly related to my electronics hobby, but electricity did play a major role.

The time frame was 1970 or 1971. I had broken my second car. I had removed the carbureator for rebuilding and found that a previous owner had used gasket sealer on the carbureator to manifold gasket. It was stuck to the manifold real good. Attempts to scrape the gasket off left much debris behind which would not allow the new one to seal properly. The standard procedure for a backyard high school mechanic was to apply a suitable solvent and attack with a paint scraper. The solvent of choice in my backyard was gasoline. I had poured a good bit of gas on the manifold several times and was making headway at the old gasket when it happened.

I was concentrating on the task at hand and set the (steel) gas can down.....right on the car battery. The big spark blew a hole in the bottom of the can, promptly setting me, the car, and the ground under the car on fire! Instinct took over and I covered the 50 or so feet from the car to the lake in the back yard in about 2 tenths of a nanosecond! After I was suitably extinguished, I saw the black cloud eminating from the car.

Putting a gasoline fire out with a garden hose doesn't usually work to well since the gas floats on the water, but I finally succeded to discover that the cars battery was now toasting the wiring harness since all of the insulation had melted. The car was a 1965 Pontiac Grand Prix, which contains about 65 miles of wire, and 47 miles of vacuum hose,.....All melted.

It took me about 3 months, but I did get that car running again. Almost all of the hair was burned off my body, and head, but there were no serious burns.
__________________
Too much power is almost enough! Turn it up till it explodes - then back up just a little.
  Reply With Quote
Old 23rd July 2010, 05:31 AM   #3
diyAudio Member
 
Join Date: Feb 2002
Location: Western Sydney
last major act of stupidity (minor ones still continue of course...) building a wall frame for my deck, trying to insert said frame between the deck uprights standing on two milk crates. The crates weren't stacked properly so came down on my assets catching my ankle (already smashed 20 years before in a bike crash - my fault) between the frame & the crates. Continued with frame insertion but by the time I'd finished my ankle was twice it's normal size - off work for a couple of weeks...
__________________
Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
  Reply With Quote
Old 23rd July 2010, 05:44 AM   #4
CBS240 is offline CBS240  United States
diyAudio Member
 
CBS240's Avatar
 
Join Date: Aug 2005
Location: K-town
Stupid as pertaining to a recent electronics blunder.......negating to discharge the PS capacitor bank before fiddling with the circuit. While soldering some small SMD, the solder wire shorted out the PS caps into the tiny SMD circuits and the whole lot went up in a poof of smoke. ......

At least it wasn't any of my THAT 340 arrays.

Good thing I have a few extra PCBs.
__________________
All the trouble I've ever been in started out as fun......
  Reply With Quote
Old 23rd July 2010, 09:59 AM   #5
diyAudio Member
 
chris661's Avatar
 
Join Date: Feb 2008
Location: Sheffield
Blog Entries: 8
I've had a couple of run-ins with mains stuff (230v, not your wimpy 110v in America).

The first: lid off an amplifier, tried to plug in the IEC mains lead. Needed a good sove so I held on to the socket inside the amplifier. Plugged it in and got 230v across my index finger. Felt strange to say the least. Fairly safe though.

The next one is a lot more dangerous and I'm lucky to have survived really...
Fitted new PSU caps to an old amplifier that needed it. I started poking around (when it was powered up) to see if anything was getting warm before I closed up. So, to set the scene - left hand, grounded on the case. Then my right hand came into contact with the input of the mains transformer.
My insides hurt for days afterwards.

Of course, there's the usual burning myself with the soldering iron...

Oh, here's one. "Testing" a broken guitar amp (didn't know the extent of the broken-ness at the time). Replaced the internal speaker that had gone open circuit, put in an Eminence Alpha 10, because it was spare and the right size. Powered it up and the positive DC rail of the amplifier went through the speaker. Now, say what you like about it's sound, if it'll take 30V DC for a while, it's not doing too badly. It was loud, too (PSU ripple came through). Turned out that, under heavy use, one of the output transistors had melted through the mica insulation and one of the rails went to ground, but had taken a 2.2 ohm resistor with it, I mean, that thing had almost exploded, black burns on the PCB for an inch each way.
__________________
"Throwing parts at a failure is like throwing sponges at a rainstorm." - Enzo
My setup: http://www.diyaudio.com/forums/multi...tang-band.html
  Reply With Quote
Old 23rd July 2010, 11:54 AM   #6
diyAudio Member
 
Join Date: May 2010
Location: Where the world's best tea come from:Kericho Kenya
That incident with the car battery reminds me of a stupid moment back in my younger days.I was in kindergarten and i had just learnt the basic circuit of two drycells and a bulb.
Now its stupid,but then it was an ingenious idea that if i connect the bulb to a car battery,it would light up brighter.I went ahead with the idea and connected the bulb.I was not hurt but the explosion scared the sh*t out of me!Since then,I've never seen a bulb explode.
In another moment,the same car battery was laying on the floor.There was a jumper cable nearby with rounded ends.I still don't know what i was trying to archieve but i figured out that the jumper cable 'should' be connected to the battery terminals.I did connect the cable and saw the first sparks in my life!It scared me half to death.
Sometimes i tend to think that the two incidents made electronics my hobby.
__________________
if there are no sparks,it probably doesn't work!
  Reply With Quote
Old 23rd July 2010, 01:31 PM   #7
Banned
 
Join Date: Jan 2008
Blog Entries: 2
I have lost count of the near misses I have had.

When I was about 3 years old, I unscrewed the torpedo switch on a bedside lamp and stuck my finger in. The spring-loaded switch promptly closed on my finger and wouldn't let go. 240 volts. My dad rescued me when he heard me bellowing, I guess the bed and mattress provided some insulation which may have saved my life. 'It bit me', I said.

When I was about 12 I used to like to use acetylene to weld small pieces of steel together. Not for any purposes, it just fascinated me that I could actually do it.

I used to generate the acetylene in a conical flask with water in it. I'd chuck in a few lumps of calcium carbide which you could still buy in bike shops at that time, it was used in bike headlamps since it burns with a bright white flame when pure. The flask had a rubber bung in it pierced to accept a piece of glass tubing bent at right angles and pulled out to neck it down into a nozzle capable of producing a fine jet. I'd fire the jet at a steady candle flame, but holding it back far enough so that the Bernoulli effect dragged enough air into the stream to produce a hot flame, which the candle flame kept alight.

The presssure in the flask was so high that I tied the bung on but I still had to grip the flask and bung tightly to keep the bung from popping out. Give it a shake to encourage the gas production...

It was only later in school I discovered that acetylene explodes spontaneously under pressure. The triple carbon bond is unstable and the gas decomposes into hydrogen and soot with the release of considerable energy.

It's over 40 years ago but it still brings me out in a sweat to think about it...

Then there was the time I nearly lost my fingers to a paper squib filled with homemade guncotton. Boy does that stuff burn quick, don't try to use it for a fuze.

And the time I thought I'd lost my hearing hitting a mixture of sodium chloride and sulphur with a lump hammer. I could still hear the ringing in my ears the next day.

One day we were messing about in the lab with a Bunsen burner which was intended for use with coal gas. We had it connected to a bottle of butane. I was at least 7 feet away at the end of the bench but the gas had been turned on for a while. For some reason I suggested to one of the other 'experimenters' that he should light the burner. Immediately he did so a large cloud of nearly pure gas which was hanging in the air between the burner and me ignited. The visible flame front came rushing towards me and before I could react removed my eyebrows and eyelashes as it passed. It was blind luck that it wasn't better mixed with air or it would have detonated.

The good old days. They say: 'it's better to be born lucky than rich...'

w
  Reply With Quote
Old 23rd July 2010, 05:44 PM   #8
diyAudio Member
 
firechief's Avatar
 
Join Date: Sep 2008
Location: Near Seattle Wa
I predict that this thread will live long and prosper. It was about 1978 and I was working as a technician at a marine radio company tuning up new production HF radios (1-30Mhz) These radios had tuning elements for each channel that had to be adjusted. So microphone in left hand and screwdriver in right hand. Key up and tune right! Well that is until my right thumb slipped onto the plate of one of the transmit tubes. Thats B+ in the hundreds of volts plus RF in the 150W range. This made a nice jaged hole in my finger on it's way to the bone, no blood mind you, just carterized flesh. I also flew back about 6 feet and banged into the wall. In those days there way no thought of law suits or liability, the boss just asked if I needed to go home and rest.
  Reply With Quote
Old 23rd July 2010, 06:35 PM   #9
diyAudio Member
 
Join Date: May 2010
Location: Where the world's best tea come from:Kericho Kenya
Wakibaki,that username means something in swahili.One,'Kibaki' is my country's president and two,'wa' means 'belong to' or 'son/daughter to'.
You just gave me an idea about hitting NaCl with sulphur,its sounds stupid but am gonna do it...soon.I'll post the 'results'.
__________________
if there are no sparks,it probably doesn't work!
  Reply With Quote
Old 24th July 2010, 08:44 AM   #10
Banned
 
Join Date: Jan 2008
Blog Entries: 2
Quote:
Originally Posted by xeclipse View Post
Wakibaki,that username means something in swahili.One,'Kibaki' is my country's president and two,'wa' means 'belong to' or 'son/daughter to'.
You just gave me an idea about hitting NaCl with sulphur,its sounds stupid but am gonna do it...soon.I'll post the 'results'.
Sorry, that's an error on my part, it's sodium chlorATE, NaClO3, a common weedkiller, not sodiun chlorIDE, which is common salt.

w
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
I have things sauuuuuce Swap Meet 0 13th October 2006 02:40 AM
Things important to be said..helped by Mr. John Mateus to express things. destroyer X Solid State 22 31st July 2006 07:21 PM
Of all the stupid things! gearheaddruid Multi-Way 5 12th August 2005 03:18 AM
A few things.... Ziller Everything Else 11 9th January 2002 04:44 PM


New To Site? Need Help?

All times are GMT. The time now is 05:19 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2