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In Reply to: RE: this looks like fun: a really cheap DIY ocilloscope posted by mbhcid on May 13, 2009 at 18:24:04
"SMT soldering skill required!"
That leaves me out, even if it did work.
Follow Ups:
Asylum sponsor Hagerman Technologies... Jim Hagerman made a short video demonstrating a method for hand-soldering SMDs.
Hand-Soldering SMDs
Julien
"There's someone in my head, but it's not me"
So it hope a pray there are no shorts.
How not to do a SMD.
Oh, man that guy sucks at SMT soldering.
You should not have to vacuum off excess, as there should be no excess.
I guess he gets the job done but he would never last in a production environment.
I'm just a novice but Jim's technique "looks" to be simpler and faster
Is there some QC issue caused by flowing it on and vacuuming, then cleaning and checking for any solder bridges?
I'm curious. Thanks!
Julien
"There's someone in my head, but it's not me"
That looks pretty easy!
Personally I think this guy uses WAY too much flux but he is miles ahead of the GLOB IT ON and vacuum it off video previously posted.
Thanks.
I'd really have to want to build a circuit to go through all that, and for me, that toy scope isn't it!
Thanks again for the link. It's amazing to watch.
If you can keep a Shovelhead running you can SMT.
Cheers
And just what, may I ask, might you be implying regarding Shovelheads, sir?
Ok, ok, I'll give you that one. But, on the other hand, a push-rod is a lot bigger than those teeny SMT's. I've been keeping my Shovel running for thirty four years, but I'm going to need some Superman microscopic vision glasses to learn to make a good joint on the SMT's at my age!
SMT soldering is beyond my capability too. But I could probably find a friend to handle that
Max input 50V
10x probe makes that 500V
100x probe makes that 5000V
Does anyone want to test fate measuring 500V with a 100x probe?
Even at 30kV, the max my ESD gun could generate, I was only getting somewhere around a half to full one inch arcs. If you live on the peak of mt everest or in a high atmosphere weather balloon though you might want to take a little more precaution depnding on 1kV source output impedance. ;-) The ESD gun was based on human body model and just caused a pinch feeling in my toe when I tried discharging through it @30kV but it made the beatle crawling across the ESD bench quit moving when he got used as the path to ground.
One is brave when young.
It is not voltage but curent to ground that kills; 5 mA thru the heart and you are dead.
Scope probes are not reliable, even expensive ones. One careless error, and it can really hurt.
"One is brave when young."
Well, I happened to have the specs for this equipment and it is based on the human body model which means it only supplies a very limited amount of charge for each discharge then it's spent until recharged...something like 10's of pico farrads. Besides, it's just a toe. I have four more on that foot. Luckily the toe is fine.
"It is not voltage but curent to ground that kills; 5 mA thru the heart and you are dead."
I'm well aware of this and so very carefully made my selection of body parts to ionize.
"Scope probes are not reliable, even expensive ones. One careless error, and it can really hurt."
In general I'm not very comfy working around high voltages but in this case allowed my ability to engineer a non deadly self experiment combined with a great curiosity of the unknown and flat out boredom to overcome my fears of whatever pain, disfigurement, or loss of life that might be the result. The QA dude was standing there watching and thought I was insane. You might say it was necessary to put full trust in my understanding of the physics involved in order to work up the nerve. I precisely predicted the results of the experiment before carrying it out adding to my confidence in my understanding of how ESD will occur. Trust in the theory grasshopper.
Scope probes are not reliable, even expensive ones. One careless error, and it can really hurt.
Sure if you are careless you can be hurt walking down a hallway.
How do you think high voltage devices like switching power supplies are designed and tested? Somebody somewhere had to put a scope on it and make sure it's working right.
I have not seen anyone get injured by a scope probe's insulation failing.
I have see scope probe ground leads vaporize. But this is most often due to using a grounded scope when a signal ground has a large voltage potential above or below Earth ground.
Our transformers have a 660VAC tap for the ferro cap. When doing transformer qualifications I measure the voltage and compare phase on this tap with a 100X or 200X probe.
I'm still here to type this...
I have 2 x100 probes rated at 1Kv!
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