EEVblog Electronics Community Forum
General => General Technical Chat => Topic started by: Madsaaby on December 23, 2012, 06:48:37 pm
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>:D Lets pull an amp through a 20 mA LED, just because it's fun :)
Go to 2:20 to skip the boring part ;)
- Mads
Almost killed by an LED! - Test of HP E3632a current limiting. (https://www.youtube.com/watch?v=8hpV46RcC2E#ws)
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"We show you this so you won't have to do it at home" :-BROKE
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Bond wire vapourised.........
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"We show you this so you won't have to do it at home" :-BROKE
Or: "Another idea for stuff to try at home!" Heh :P
-Mads
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Bond wire vapourised.........
Yup, and it was in a hurry to do so :D 8)
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I once connected a 74hc chip the wrong way around. For a few seconds, nothing happened. Then short high pitched noise. A small splinter had been ejected from the chip. If anything, that could have made me blind.
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Well, not a surprise....for sure. Probably two leads with crocodile clips would have been nicer to blow the LED ;).... especially for those who WILL try it now at home.....
I remember when an OP amp was attached to the wrong polarity at it's supply pins. Our 741's did have a nice crater after that.....well, and didn't work anymore.
Yeah yeah....those school days.....
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You know you did it wrong when you blow the can off a TO3 part........... I have done a couple of TO100 cans that left only a set of pins and some glass behind.
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I managed to blow an LED up once. It didn't shoot like that though, it just cracked, so the pop could be pulled off.
I did manage to make an LM358 glow the other day (accidentally): http://www.flickr.com/photos/36651585@N04/8295881542/#in/photostream. (http://www.flickr.com/photos/36651585@N04/8295881542/#in/photostream.) I was deliberately running it from a supply voltage which was too high, so I expected it to fail, but i didn't expect it to melt the breadboard :).
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You know you did it wrong when you blow the can off a TO3 part...........
Now that must have been an impressive bang >:D I did pop loads of TO220 FETs while expirimenting with coilguns. Especially when you parallel them up, if one goes they all go. FET seems to stand for Fiercely Exploding Transistor :-DD
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I did manage to make an LM358 glow the other day (accidentally): http://www.flickr.com/photos/36651585@N04/8295881542/#in/photostream. (http://www.flickr.com/photos/36651585@N04/8295881542/#in/photostream.)
Nice parallel bundle of resistors there! ;)
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Nice bunch of 10 ohm resistors, but that 22 ohm resistor sticks out like a sore thumb...
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erm, the lesson I take from this is how impossibly fiddly it is to set voltage and current limits on an HP digital power supply. Not even a number pad! That hardly feels like a giant leap forward for mankind to me.
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erm, the lesson I take from this is how impossibly fiddly it is to set voltage and current limits on an HP digital power supply. Not even a number pad! That hardly feels like a giant leap forward for mankind to me.
I totally agree with that, one of the things I pointed out when I posted it to another, "Favorite PSU", thread.. :)
(I should say that I did only use it 15 min before i shot the video, so was a bit new to me.)
But apart from that, it's not easy to beat in my opinion.
-Mads
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Nice bunch of 10 ohm resistors, but that 22 ohm resistor sticks out like a sore thumb...
Just one or both of them ;) ?
9x 10R + 2x 22R in parallel = a pretty decent 1R power resistor :).
With regards to the HP supply, I'm surprised you can't just twiddle the knob and have to select each digit. Sounds a bit odd. Can't you just set an option for twiddling only?
BTW, otherwise looks like a nice PSU though. I like the appearance of the VFDs on the HP/Agilent gear.
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With regards to the HP supply, I'm surprised you can't just twiddle the knob and have to select each digit. Sounds a bit odd. Can't you just set an option for twiddling only?
BTW, otherwise looks like a nice PSU though. I like the appearance of the VFDs on the HP/Agilent gear.
You can just leave it on, say the first decimal place, and adjust int steps of 100 mV, it then carries over to 1 V etc.
But if you set 12.345 V, and turn it down while on the "1v" place it will only go down to 0.345 V, you'll have to go to the lower digits and set these to 0 as well.
-Mads