there is something weird that happened a while back:
i was watching TV, and fiddling with some connectors in either hand.
one was the end of a usb cable from my printer.
the other was the end of a laptop charging lead(the ground part).
all of a sudden i felt some 2 shocks in one of my hands, then it happened again.
it didn't take long to realise this was actually my heart beat. kinda scary...and confusing.
Phil Pilgrim (PhiPi) said...
One dumb mistake I continue to repeat time and time again is forgetting to slide the backshell of a connector onto the cable before soldering the wires to the pins. I hate it when that happens!
-Phil
I do that all the time.
said...
there is something weird that happened a while back:
i was watching TV, and fiddling with some connectors in either hand.
one was the end of a usb cable from my printer.
the other was the end of a laptop charging lead(the ground part).
all of a sudden i felt some 2 shocks in one of my hands, then it happened again.
it didn't take long to realise this was actually my heart beat. kinda scary...and confusing.
This happens to me now and then. If u hold the ground wire of an electrical device I assume. You can sometimes feel your heart beat as electrical shocks. Usually in your hand.
#1
I have also been connecting network routers and wireless access points up and had their power supplies tangled on the floor. I reached for what I thought was the power supply lead for the 5v switch. After plugging it into the $200 network switch I soon realised that it was the lead for the 12v access point.
#2
Hooked a 5mm led up to a 12v power supply. It heated up and the top flew off and hit the wall.
#3
Ordered a PCB I designed and then realised that the ethernet connector didn't have the pinouts I thought it did.
#4
Wired a 12v fan directly to a BS2 pin. It worked for a few seconds and then the BS2 shut its self down. The BS2 still works 100%
#5
Left a power supply connected to an electro magnet. It burnt out after 2 hours.
#6
When I was younger I connected the output of a 12v transformer to the output of a 5v transformer. I then touched the input of the 5v transformer with the 12v transformer plugged in. I got a rude shock.
While in school learning digital systems I was eager to send data out of my printer port and control my radio truck. I went to radio shack and bought 4 relays and interfaced them into the hand held radio. Then I painfully stripped and tinned each wire in the printer cable wrote a visual basic program using my logic probe to find the correct wires per command. After all this I hooked it all up to my bread board and blew my new computer motherboard caps out. Come to find out I shorted almost connections I made while wiring them up to the relays by putting diodes in backwards. Stunk up my living room and my computer ran fine till I rebooted.
It was a 2 week old motherboard and a painful pill to swallow.
I also forget the shrink wrap when soldering to a connector.
Dumbest thing? Starting out at about 11 years old, I found that it was easiest to strip wire with my teeth. To this day, I have unusually eroded front teeth due the bad habit of using my front teeth as cutters and strippers. But that is not the stupidest of my stupidity.
At about 13, I was on a ladder and wiring a light fixture in our basement. I found myself in need of stripping these wires before connecting the light fixture. Of course the first thing that came to mind was to use my teeth and I actually began to do so. Fortunately, I had second thoughts and realized that I hadn't even turned off the fuse box. In theory, I could have gotten away with it if I didn't touch ground. But I decided to get the right tools and turn off the power.
In sum, don't strip wire with your teeth and never work around live circuits without proper tools.
My second best was trying to charge a 400v capacitor in a 120VAC outlet to payback the kid next to me for shocking me with his capacitor in an electronics class. That one simply knocked me on my kiester and forced me to rethink how capacitors work differently with AC than with DC.
Assume every wire you touch is hot until tested and verified. As cowboys will tell you, never relieve yourself on a barbwire fence post as there may be a lightning strike occurring somewhere over the hill, even 50 miles away. That has got to hurt.
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It's sunny and warm here. It is always sunny and warm here.... (unless a typhoon blows through).
Tropically, G. Herzog [noparse][[/noparse] 黃鶴 ] in Taiwan
when I was about 12 I found that shorting a piece of thin insulated wire across a battery would produce a fair amount of smoke, (I know what can I say I was 12) so I decided to make a remote controlled smoke bomb. With the new coil of wire in my lap I unknowingly shorted the wire to a glowing red. It didn't take long to feel the heat, I didn't get burned but in my panic I Inhaled a big gasp of smoke, I was coughing for hours, and needless to say decided to abandon that project. that's the only time I've smoked so perhaps some good did come of it.
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DGSwaner
"When in doubt, use C4" - Jamie Hyneman, Myth Buster
A UV erasable Eprom can make a novel light source when wired wrongly. The quartz window magnifies the glowing-white wire quite impressively and lights up the entire die. Even more impressive was the fact that it glowed for over 10 minutes until we got bored watching and it still worked afterwards !
Timmoore said...
Trying catching a soldering iron after doing the same thing and having it fall off the desk. Always used a soldering stand after that!
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I`m not prejudice I hate everyone equally
i accidently created a good power supply that was safe( the voltage could only be moved 10 volts like 0-10 or 10-20) but i was aiming for A variance of 0-120 DC so i took it apart and continued to burn out POT after POT so i quit and now 2 years later i pick it up and go wow it looks like i knew what i was doing cause i was anal retentive about my work at that time.
i will figure out which pot was the one that i originally had in and put it back. but as for stupid i was sitting at my desk wearing nothing but undies and dropped the soldering iron on my bare leg
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I`m not prejudice I hate everyone equally
I've once done the shock onesself on the disposable camera thing. I, however, managed to accidentally do it with two hands. Luckily, I did not require a defribrillator.
While this wasn't something I've done, I once had a gas soldering iron who's regulator decided to die. To my annoyance it decided to die in such a way as to try and burn my finger. I must say I'm glad I had the presence of mind to calmly walk to a sink to put the damn thing out rather than drop it on the carpet!
(Luckily, the way it failed caused the butane to burn like a safety flame rather than a roaring one, so while it hurt immensely, it didn't do any lasting damage)
Growing up, I did a lot of soldering and circuit building. Late one night, I had just soldered up a circuit and set the large solder gun on the desk to the right side. The gun had a multi-pronged unusually shaped tip that wound splitting in two, curving back to a dual metal mount with bolts and catches.
Weary, and forgetting that the gun was still hot, I leaned on the table hard with both arms. Oddly, my right arm was branded with nearly the exact same design as a Shao-Lin Kung Fu master as some people thought. This was about the same time as the popular Kung Fu American television series which starred David Carradine, where he holds the red hot pot and brands his arm.
So for years, I took an unbearable ribbing, so much in fact that it led me to Asia where I took up Martial Arts Karate, Tai Chi Sword and Kung Fu. I can't say that I'm a master of the Shao Lin Temple Kung Fu but I did practice with them, and have to admit the experience has certainly led me to far away places. BTW, I never had to hold the hot pot, and never again rested my arm on the hot soldering iron!
Assume every wire you touch is hot until tested and verified. As cowboys will tell you, never relieve yourself on a barbwire fence post as there may be a lightning strike occurring somewhere over the hill, even 50 miles away. That has got to hurt. said...
Or it might be an electric fence - seen someone do that - from the response it hurt!
I wanted to build a Jacobs ladder as a kid. To get the voltage I wired up a 240V to 6.3V transformer the wrong way i.e. connected the 6.3V to 240V (I was living in Cyprus at the time) and soldered copper wire to the 240V terminals for the ladder. The transformer internal insulation wasn't good enough for the voltage - impressive bang as the insulation broke down and sparks inside and outside the transformer occurred. Had fun explaining that away.
Ive been shocked\electrocuted more times than I can count since as far back as I can remember (and those two might be related, lol)
The worst was when I went to the breaker pannel, I was <10, yea I was playing with that kinda stuff when I was that young. Anyway, there was no front on the pannel, and as I looked for the breaker I needed, I leaned in resting my hand on the top area. Luck would have it, I stuck my hand into the box, and ended up with 2 fingers on one 120v leg, 2 fingers on the other, and my bare feet on concrete. Really wasnt that bad in hindsight, not for 240v
The best was when we were wiring the new house, had the temporary wiring in the basement from when construction started. So we needed to rewire the lights to the breaker pannel. Reached right up there with the wire cutters without hesistation, not comprehending the light I was seeing by was the light I was rewiring, Snip-BAM-POP-dark. Fortunately the cutters were insulated, it was interesting trying to stumble down the ladder and out in the dark though. One of my more obvious mistakes.
Well, I do not feel that bad if I tell you:
Starting at 5 or so, I used to bind lamps and sockets to cables (not using electric tape or anything) and plug them in the mains, at those times there were no differential switches, so the house's fuses blew up, every time. Luckily I never got a shock. When my father got up from his siesta to find that there were no light, he starred at me saying "that was for sure a fat short-circuit" while changing the fuses.
Later (after not doing that anymore) I decided to connect a 12 V lamp to the mains, it not only exploded in my hand but it left a dark mark around the wall socket.
But the dumbest of all was to bypass the 5V regulator in my ZX81 to connect it directly to 5V just to mix the cables and feed 12V instead ! The sound of blowing chips is still in my mind after some 20 years. That served me as a lesson because those regulators not only regulate, but also provide an anti-dumb security measure.
This is great, I never expected so many posts [noparse]:)[/noparse]
I recently was soldering in a 8-pin male header through a piece of
perf board... well it turns out its not a good idea to hold the header
in place with your fingers on the other side of the board. The heat
conducted through the header and I have a very interesting series of
red dots on my finger from the top of the header.
How about you Parallax employees? Have you designed any "coasters" or
miswired a line of products and had to do a recall?
Anyone ever try to pull a DIL IC out with their fingers and have it spin round and bite into their thumb or finger like a multi-fanged vampire ? Any others done it more than once ?
How about that nice "bruise-y" feeling days after the blunt end of a wire or one of the strands pierces your finger as you were twisting and splicing the two·wires together? - That's always nice, and I'm not exactly sure how to prevent that one without wearing gloves.·
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔ Beau Schwabe
IC Layout Engineer
Parallax, Inc.
I can relate to the "stripping of wires with ones teeth". It's a habit I finally pretty much broke
from my teenage years. (Doesn't look good in front of the customers. <smirk>)
I recall one memorable occasion of taking telephone ring voltage in the teeth because a
friend had called my number while I was stripping wires on a live line to hook up a telephone.
Hippy said...
Anyone ever try to pull a DIL IC out with their fingers and have it spin round and bite into their thumb or finger like a multi-fanged vampire ? Any others done it more than once ?
Been there done that! still don't have a IC pulled /sigh!
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DGSwaner
"When in doubt, use C4" - Jamie Hyneman, Myth Buster
The first time I used my soldering iron (before I knew about the temperature control) I was wondering why the solder was not melting fast. I thought that if I pressed harder it would melt faster. The inevitable happened and the iron slipped off the board into my hand, like a hot knife.
I also found that it is not wise to stand backwards on a ladder reaching behind you to get the probes into the socket while looking at the meter.
Another time I was wiring in a set of outlets. My brother and I had just checked to make sure that they were all working, and I could not get one of them into the box. My brother came over to help and grabbed the outlet (the one we just checked) with both hands on both sides and flew across the room. Most of the time I do not suffer for my stupidity.
I think that is enough of my stupidity for now.
-Seth
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The pessimist is never disappointed.
hippy said...
A UV erasable Eprom can make a novel light source when wired wrongly. The quartz window magnifies the glowing-white wire quite impressively and lights up the entire die. Even more impressive was the fact that it glowed for over 10 minutes until we got bored watching and it still worked afterwards !
can you tell me how you had it wired i have some extras laying around and i have got to see it for myself
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I`m not prejudice I hate everyone equally
burn out a component figure out why it "burned out" (blew to peices or the equivilent) after the first try and before you get a chance to fix the problem you replace the broken part and turn the power back on before remebering to fix the problem and blow the replacement multiple time in a row
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I`m not prejudice I hate everyone equally
recently while trying to drill out a rivet the brand new really sharp 3/4 in diameter drill bit slipped of the rivet and proceeded to drill into my arm.
it still looks like it hurt.
but to my amazement not even an ow.
there was only me holding a cordless drill with a nice new hole in my arm .
and i was swearing at myself for doing something stupid
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I`m not prejudice I hate everyone equally
@ Lab Rat, re lighting up eprom : So many years ago ... I expect it was a 27C12 ( 12V programmable ) or similar and I recall it was just the usual 180 degree rotation error in inserting in the socket. We may have got lucky in having a really robust one.
@Lab Rat, I've done the same as hippy, 27something UV EPROM put in backwards. However after I had done than the device was for sure dead.
I'm just crazy enough to try that again on some old stock proms on, but bring them up slowly on a variable PSU.
By the way if you have some UV PROMS and a laser pointer you can get some nice diffraction patterns by reflecting the laser off the chip onto a white surface. Different generations of prom produce different patterns as the feature sizes of the devices decreased.
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For me, the past is not over yet.
the 3/4 drill bit was sharp and i always use a really large drill bit to drill out rivits on something that i am scraping and no it was not a bridge it was an aluminum lawn chair.
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I`m not prejudice I hate everyone equally
Comments
i was watching TV, and fiddling with some connectors in either hand.
one was the end of a usb cable from my printer.
the other was the end of a laptop charging lead(the ground part).
all of a sudden i felt some 2 shocks in one of my hands, then it happened again.
it didn't take long to realise this was actually my heart beat. kinda scary...and confusing.
I do that all the time.
This happens to me now and then. If u hold the ground wire of an electrical device I assume. You can sometimes feel your heart beat as electrical shocks. Usually in your hand.
#1
I have also been connecting network routers and wireless access points up and had their power supplies tangled on the floor. I reached for what I thought was the power supply lead for the 5v switch. After plugging it into the $200 network switch I soon realised that it was the lead for the 12v access point.
#2
Hooked a 5mm led up to a 12v power supply. It heated up and the top flew off and hit the wall.
#3
Ordered a PCB I designed and then realised that the ethernet connector didn't have the pinouts I thought it did.
#4
Wired a 12v fan directly to a BS2 pin. It worked for a few seconds and then the BS2 shut its self down. The BS2 still works 100%
#5
Left a power supply connected to an electro magnet. It burnt out after 2 hours.
#6
When I was younger I connected the output of a 12v transformer to the output of a 5v transformer. I then touched the input of the 5v transformer with the 12v transformer plugged in. I got a rude shock.
I'm sure there's plenty more.
I stuff up a lot.
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Building Blocks To The Propeller Chip A web site designed to help people who are new to the propeller chip.
Guitar Hero controller using the prop (WIP) --> HERE
Post Edited (computer guy) : 10/8/2008 3:43:13 AM GMT
It was a 2 week old motherboard and a painful pill to swallow.
I also forget the shrink wrap when soldering to a connector.
The other stupid thing is the countless number of times I've proven one of the fundamental laws of electrical engineering:·
········· Anything can be a fuse.
It's just a matter of amperage.··My most expensive·'fuse' was a UV prom based microprocessor back in the day when they were about $100.
At about 13, I was on a ladder and wiring a light fixture in our basement. I found myself in need of stripping these wires before connecting the light fixture. Of course the first thing that came to mind was to use my teeth and I actually began to do so. Fortunately, I had second thoughts and realized that I hadn't even turned off the fuse box. In theory, I could have gotten away with it if I didn't touch ground. But I decided to get the right tools and turn off the power.
In sum, don't strip wire with your teeth and never work around live circuits without proper tools.
My second best was trying to charge a 400v capacitor in a 120VAC outlet to payback the kid next to me for shocking me with his capacitor in an electronics class. That one simply knocked me on my kiester and forced me to rethink how capacitors work differently with AC than with DC.
Assume every wire you touch is hot until tested and verified. As cowboys will tell you, never relieve yourself on a barbwire fence post as there may be a lightning strike occurring somewhere over the hill, even 50 miles away. That has got to hurt.
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It's sunny and warm here. It is always sunny and warm here.... (unless a typhoon blows through).
Tropically, G. Herzog [noparse][[/noparse] 黃鶴 ] in Taiwan
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DGSwaner
"When in doubt, use C4" - Jamie Hyneman, Myth Buster
.... In the microwave.· That was a very bad day! @%$#
BTW) This did NOT happen at Parallax
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Beau Schwabe
IC Layout Engineer
Parallax, Inc.
I`m not prejudice I hate everyone equally
i will figure out which pot was the one that i originally had in and put it back. but as for stupid i was sitting at my desk wearing nothing but undies and dropped the soldering iron on my bare leg
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I`m not prejudice I hate everyone equally
While this wasn't something I've done, I once had a gas soldering iron who's regulator decided to die. To my annoyance it decided to die in such a way as to try and burn my finger. I must say I'm glad I had the presence of mind to calmly walk to a sink to put the damn thing out rather than drop it on the carpet!
(Luckily, the way it failed caused the butane to burn like a safety flame rather than a roaring one, so while it hurt immensely, it didn't do any lasting damage)
Weary, and forgetting that the gun was still hot, I leaned on the table hard with both arms. Oddly, my right arm was branded with nearly the exact same design as a Shao-Lin Kung Fu master as some people thought. This was about the same time as the popular Kung Fu American television series which starred David Carradine, where he holds the red hot pot and brands his arm.
So for years, I took an unbearable ribbing, so much in fact that it led me to Asia where I took up Martial Arts Karate, Tai Chi Sword and Kung Fu. I can't say that I'm a master of the Shao Lin Temple Kung Fu but I did practice with them, and have to admit the experience has certainly led me to far away places. BTW, I never had to hold the hot pot, and never again rested my arm on the hot soldering iron!
I wanted to build a Jacobs ladder as a kid. To get the voltage I wired up a 240V to 6.3V transformer the wrong way i.e. connected the 6.3V to 240V (I was living in Cyprus at the time) and soldered copper wire to the 240V terminals for the ladder. The transformer internal insulation wasn't good enough for the voltage - impressive bang as the insulation broke down and sparks inside and outside the transformer occurred. Had fun explaining that away.
The worst was when I went to the breaker pannel, I was <10, yea I was playing with that kinda stuff when I was that young. Anyway, there was no front on the pannel, and as I looked for the breaker I needed, I leaned in resting my hand on the top area. Luck would have it, I stuck my hand into the box, and ended up with 2 fingers on one 120v leg, 2 fingers on the other, and my bare feet on concrete. Really wasnt that bad in hindsight, not for 240v
The best was when we were wiring the new house, had the temporary wiring in the basement from when construction started. So we needed to rewire the lights to the breaker pannel. Reached right up there with the wire cutters without hesistation, not comprehending the light I was seeing by was the light I was rewiring, Snip-BAM-POP-dark. Fortunately the cutters were insulated, it was interesting trying to stumble down the ladder and out in the dark though. One of my more obvious mistakes.
Starting at 5 or so, I used to bind lamps and sockets to cables (not using electric tape or anything) and plug them in the mains, at those times there were no differential switches, so the house's fuses blew up, every time. Luckily I never got a shock. When my father got up from his siesta to find that there were no light, he starred at me saying "that was for sure a fat short-circuit" while changing the fuses.
Later (after not doing that anymore) I decided to connect a 12 V lamp to the mains, it not only exploded in my hand but it left a dark mark around the wall socket.
But the dumbest of all was to bypass the 5V regulator in my ZX81 to connect it directly to 5V just to mix the cables and feed 12V instead ! The sound of blowing chips is still in my mind after some 20 years. That served me as a lesson because those regulators not only regulate, but also provide an anti-dumb security measure.
I recently was soldering in a 8-pin male header through a piece of
perf board... well it turns out its not a good idea to hold the header
in place with your fingers on the other side of the board. The heat
conducted through the header and I have a very interesting series of
red dots on my finger from the top of the header.
How about you Parallax employees? Have you designed any "coasters" or
miswired a line of products and had to do a recall?
Or something of the like?
What's the dumbest thing to happen at Parallax?
How about that nice "bruise-y" feeling days after the blunt end of a wire or one of the strands pierces your finger as you were twisting and splicing the two·wires together? - That's always nice, and I'm not exactly sure how to prevent that one without wearing gloves.·
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Beau Schwabe
IC Layout Engineer
Parallax, Inc.
from my teenage years. (Doesn't look good in front of the customers. <smirk>)
I recall one memorable occasion of taking telephone ring voltage in the teeth because a
friend had called my number while I was stripping wires on a live line to hook up a telephone.
OBC
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New to the Propeller?
Getting started with a Propeller Protoboard?
Check out: Introduction to the Proboard & Propeller Cookbook 1.4
Updates to the Cookbook are now posted to: Propeller.warrantyvoid.us
Got an SD card connected? - PropDOS
Been there done that! still don't have a IC pulled /sigh!
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DGSwaner
"When in doubt, use C4" - Jamie Hyneman, Myth Buster
I also found that it is not wise to stand backwards on a ladder reaching behind you to get the probes into the socket while looking at the meter.
Another time I was wiring in a set of outlets. My brother and I had just checked to make sure that they were all working, and I could not get one of them into the box. My brother came over to help and grabbed the outlet (the one we just checked) with both hands on both sides and flew across the room. Most of the time I do not suffer for my stupidity.
I think that is enough of my stupidity for now.
-Seth
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The pessimist is never disappointed.
Post Edited (Seth) : 10/9/2008 6:45:16 PM GMT
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I`m not prejudice I hate everyone equally
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I`m not prejudice I hate everyone equally
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I`m not prejudice I hate everyone equally
it still looks like it hurt.
but to my amazement not even an ow.
there was only me holding a cordless drill with a nice new hole in my arm .
and i was swearing at myself for doing something stupid
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I`m not prejudice I hate everyone equally
3/4" drill bit?!! That must've been one heckuva rivet! What were you dismantling — a bridge?
DIL means "Dual InLine", BTW: a DIP.
-Phil
I'm just crazy enough to try that again on some old stock proms on, but bring them up slowly on a variable PSU.
By the way if you have some UV PROMS and a laser pointer you can get some nice diffraction patterns by reflecting the laser off the chip onto a white surface. Different generations of prom produce different patterns as the feature sizes of the devices decreased.
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For me, the past is not over yet.
When I was a kid, I put a penny in the fuse socket.· Ouch.
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I`m not prejudice I hate everyone equally