9 responses to “EEVblog #16 – All about CMOS SCR Latchup”

• Eric July 5th, 2009 at 14:37

  very interesting info,

  Dave, I received my oscilloscope (DS1052E), do you have any good advise as far as how I can learn to properly use this thing? a course or a book perhaps?

  You seem to know your stuff (possible understatement), any advise would be great!

  First time scope owner, and I’m a cheapskate too.

  Thanks! Eric

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  • admin July 6th, 2009 at 10:45

    That’s a tough one, don’t know any good beginner tutorials off-hand. Plenty of info on the web of course, googling “oscilloscope tutorial” brings up plenty of stuff, some good, some bad I’m sure – but how to wade through it all?
    This looks pretty comprehensive at first glance:
    http://www.hobbyprojects.com/oscilloscope_tutorial.html

    Reply

• Anthony July 7th, 2009 at 01:22

  Excellent post as per usual David. As much as I love the wonderful equipment reviews, it is especially nice seeing some very relevant theory and applications. Please keep it coming!

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• Andrew July 7th, 2009 at 03:12

  Eric, the biggest issue you’ll face when learning to work with an oscilloscope is where to get some signals from. Without some input signals it gets rather boring, quickly. And the built-in probe calibration signal generator is not very interesting.

  So my advice is that you grap a couple of transistors, OpAmps, 555th, MCUs, or whatever you like, and build a few signal generators. The web is full of schematics for building simple sawtooth, rectangular, and sine wave generators, with a couple of the aforementioned components.

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• Brian Hoskins July 8th, 2009 at 03:18

  Learning to drive scope is a little bit like learning to drive a car. I’m sure you could find some theoretical stuff on it which would arm you with a good background in the basics, but in the end the only *real* way to become a good driver is to get out and learn for yourself. And, as with all things, practice makes perfect.

  So yeah, read some stuff – find out what timebase is, find out what a trigger is, etc. Then after that the only way forwards is to use it on some real life applications.

  Brian

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• Eric July 8th, 2009 at 11:40

  Great advice guys, My roommate has a special motor he built that i hooked it up to, looks pretty cool on the scope!!!

  Also built a simple 555 circuit and played with it.

  Thanks for all the help guys,

  And Dave, the website you linked was very helpfull, Thanks again.

  Eric

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• Sabrina Holmes October 3rd, 2009 at 10:50

  I would suggest using a fast schottky diode (0.3v drop) to stay clear of the -0.6v or 5.6v.

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• Sean October 18th, 2009 at 15:02

  SCR Latchup = inadvertent creation of a crowbar circuit between power and ground.

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• walter delbono November 24th, 2009 at 16:36

  awesome video…

  i have some nice imformation…

  http://dev.emcelettronica.com/latch-protection-mosfet-drivers

  and…

  http://ww1.microchip.com/downloads/en/AppNotes/00763c.pdf?from=rss

  <3 eevblog <3

  

  Reply