31–40 of 49 posts
What are the dangers here? What happens if that thin insulation between the copper bars breaks? Can the current jump to you if you use this bare handed?
Isn't it incredibly dangerous to disassemble microwaves?
Earlier quoted context omitted.
Well it's only 2 volts. So nothing will happen. Unless your hand is all sweaty maybe. Then maybe you'll feel it. I wouldn't worry.
uh... wut I believe it's the amps you need to worry about; "amps kill." I believe it takes about 1 amp to kill a person. This thing is outputting somewhere around 55 amps (if I remember right).
I (current) = V (voltage)/R (resistance)
Typical skin resistance can be as high as 100MΩ (mega ohms) but is often cited as 10MΩ. Even if we assume just 1MΩ (1000000 ohms) skin resistance, then at 2.3V as shown in the video the current would be 0.0000023 A or 2.3 μA (micro amperes).
These MOT based spot welders transfer far more heat to cells than capacitive discharge welders. This can result in the damage to heat sensitive components inside the cells which is the same reason that soldering isn't recommended for lithium cells. To get around those issues, I built a capacitive discharge spot welder for tabbing lithium ion cells a couple years ago: http://robruark.com/projects/welder/welder.html
What is the cause of the excess heat transfer? Is it mainly an excess pulse duration? I notice that the project in the OP was being pulsed on the order of 100s of ms, long enough to get a visible glow. Or is the excess heat caused by the fact that the OP runs at constant current for the entire duration of the pulse, where a capacitive discharge design is going to have the current falling off during the pulse? Or is i…
Earlier quoted context omitted.
The magnetron can have insulators made of a toxic substance that can be dangerous as a dust. This guy is just using the transformer for it's convenient laminates and primary winding - probably could have used a similar transformer with suitable current handling capacity but dead microwave ovens are fairly common. I have 3
Some beryllium ceramics I heard...
Modern magnetrons tend to use alumina-based ceramics instead.
These MOT based spot welders transfer far more heat to cells than capacitive discharge welders. This can result in the damage to heat sensitive components inside the cells which is the same reason that soldering isn't recommended for lithium cells. To get around those issues, I built a capacitive discharge spot welder for tabbing lithium ion cells a couple years ago: http://robruark.com/projects/welder/welder.html
These MOT based spot welders transfer far more heat to cells than capacitive discharge welders. This can result in the damage to heat sensitive components inside the cells which is the same reason that soldering isn't recommended for lithium cells. To get around those issues, I built a capacitive discharge spot welder for tabbing lithium ion cells a couple years ago: http://robruark.com/projects/welder/welder.html
I used to get a kick in middle school disassembling disposable cameras (unlimited supply since dad worked in a grocery store with a photo lab), charging the circuit, and discharging on coins.
Earlier quoted context omitted.
Well it's only 2 volts. So nothing will happen. Unless your hand is all sweaty maybe. Then maybe you'll feel it. I wouldn't worry.
uh... wut I believe it's the amps you need to worry about; "amps kill." I believe it takes about 1 amp to kill a person. This thing is outputting somewhere around 55 amps (if I remember right).
Earlier quoted context omitted.
uh... wut I believe it's the amps you need to worry about; "amps kill." I believe it takes about 1 amp to kill a person. This thing is outputting somewhere around 55 amps (if I remember right).
Current availability is not a guarantee of current delivery. I (current) = V (voltage)/R (resistance) Typical skin resistance can be as high as 100MΩ (mega ohms) but is often cited as 10MΩ. Even if we assume just 1MΩ (1000000 ohms) skin resistance, then at 2.3V as shown in the video the current would be 0.0000023 A or 2.3 μA (micro amperes).
Earlier quoted context omitted.
The magnetron can have insulators made of a toxic substance that can be dangerous as a dust. This guy is just using the transformer for it's convenient laminates and primary winding - probably could have used a similar transformer with suitable current handling capacity but dead microwave ovens are fairly common. I have 3
Some beryllium ceramics I heard...