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An unusual Oscilloscope phenomenon

Discussion in 'Hobby Electronics' started by David L. Jones, Jun 25, 2009.

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  1. OK, how about "image charge" then?

    Jeroen Belleman
     
  2. Joerg

    Joerg Guest

    Nice. Would be even nicer without the attached city :)
    Possibly. It even happens in standby power so maybe it's the SMPS in there.
     
  3. Joerg

    Joerg Guest

    At least you've got the memories, that's all that really counts. I
    donated my HW101 to a ham in former East Germany after the wall fell.
    Back then they didn't have the funds to buy western quality gear. I kept
    the older HW100 because that has a white-knuckle supply, direct
    rectification and Cockroft-Walton cascade from 230VAC mains. Plug it in
    the wrong way ... *BAM*. He got the good set, with original power supply
    and the whole thing looked hardly used, almost like new. He was really
    happy.
     
  4. Joerg

    Joerg Guest

    Look at the bright side: It could be worse. My Chinese meters here are
    bonbon-purple. Channel 3 on my DSO is bonbon-pink.

    I am very impressed with the little Durafix single Li-Ion pistol-style
    electric screwdriver. $15. We had to build a large step box for our
    Rottie because he has trouble getting in and out of the car. The long
    deck screws were hard to turn but it muscled them in. Sure saved me a
    blister.
     
  5. Rich Grise

    Rich Grise Guest

    You put the glue on the surface and let it dry, and lay thin pieces of
    wood across it. Put the glue on the formica, let it dry, and lay it
    on top of the shims. The shims have no glue, so don't stick. Line
    the formica up, on top of the shims, and one by one take the shims
    out and let the formica stick to the surface.

    I've seen it done on those "home improvement"-type TV shows. :)

    Cheers!
    Rich
     
  6. ehsjr

    ehsjr Guest

    They don't fix it - they prevent it. You contact cement the
    veneer & the top and let the cement dry. Lay shims on the top,
    lay the veneer on top of the shims. Line the veneer up properly,
    then withdraw the shims one at a time, pressing the veneer down
    onto the top as you go. You cut the formica before you start,
    such that it will hang over the top by about 1/4" on all edges.
    After sticking the formica to the top, you use a router to trim
    the formica to be exactly even with the top on all edges, with a
    bit of a bevel on the dege of the formica.

    Ed
     
  7. Nico Coesel

    Nico Coesel Guest

    The waveforms-per-second depends on the sample rate, the length of the
    acquisition memory and the throughput of the display system. Another
    thing that limits the refreshrate is the refreshrate of the display.
    The latter can be circumvented by adding several swaps into one
    signal.
    That depends on the samplerate and the bandwidth. If the samplerate is
    lower then the maximum bandwidth expect aliasing effects unless it is
    a sampling oscilloscope.
     
  8. ehsjr

    ehsjr Guest

    krw wrote:

    Where do you get reports on the Harbor Freight stuff?
    I'd like to be able to see what others think about what
    I might buy - like their 12' sliding compound miter saw.

    Sometimes they're good for power tools that will be used
    infrequently. The stuff I've bought from them for light
    use has never disappointed - but I haven't used it either
    under harsh conditions or extensively.

    Ed
     
  9. ehsjr

    ehsjr Guest

    John Larkin wrote:

    Wow. You're making me drool.
     
  10. Rich Grise

    Rich Grise Guest

  11. krw

    krw Guest

    It seems it costs a lot of money to get a decent color. The Tek
    scopes at work have gawd-awful trace colors. Not only are they
    "fruity", they're hard to see.
    We talked about that before. I *love* the Bosch "Impactor" as a
    screwdriver. I can even drive large Phillips screws without chewing
    up the heads. It's the neatest tool I've bought in a long time.
     
  12. krw

    krw Guest

    Cordless. 12V Li-Ion, that matches three of my drivers and drills.
    ;-)
    We didn't have electric drills in shop. I *hated* shop.
    I've sprained a wrist driving screws. A good driver has a *lot* of
    torque. OTOH, I have a 3/8" air wrench that I think I could stop. I
    bought a 1/2" impact wrench that I could stop by hand with a 1" socket
    installed. It went back.
     
  13. krw

    krw Guest

    I have their 10" SLCS. For $100 it's not bad at all. I just bought
    it to cut 2x4s and it does that very well. I did some molding with it
    in my last house, too. I'll likely replace it with a better saw in
    the next year or so, though.

    As far as discussions of these things, rec.woodworking is likely the
    best place. There are a lot of tool snobs there too, but also a lot
    of information.
    I don't have too many HF power tools, but a few. You really have to
    be careful. The above SLCS is fairly good (it's weak on compound
    miters). I've looked at their wet saw and would have bought it if I
    knew about it before I bought mine. OTOH, I have a couple of cordless
    drills that are just so bad that I don't even count them.
     
  14. It is indeed.
    In fact, it's that exact same setup where I first found this issue,
    debugging that actual design as you see there, probably only days before or
    after that photo was taken.

    Dave.
     
  15. Nico Coesel

    Nico Coesel Guest

     
  16. ehsjr

    ehsjr Guest

  17. ehsjr

    ehsjr Guest

    Thanks for the info on the saw. My use would be like yours,
    primarily rough carpentry. I have a bunch of decorative
    "garden ties" to replace, and the 12" saw will handle them.

    I have a $24 1/2" hammer drill from them - flawless for the
    few times I've used it. The cordless 9.6V is pretty much
    useless, except for maybe drilling a couple of holes in
    a project box. I love their cheap $2.99 meters for monitoring
    stuff, and as a source of LCD displays for projects. Haven't
    seen that price for a while though. It's kinda fun to watch
    them mis-measure noisy DC. :)

    Ed
     
  18. Joerg

    Joerg Guest

    Or a shoot-out ...

    Well, not in your neighborhood but we had first-time visitors from
    Germany a few years ago, our former neighbors. After two week of west
    coast sightseeing they stayed in a ritzy S.F. hotel to see the town
    before heading out to us. Shooting right in the lobby there, IIRC a
    fatal one. They were quite shaken when they got here.
     
  19. Joerg

    Joerg Guest

    Luckily we don't hear shootings, except the occasional rifle shots into
    the air out of trucks when the drivers had too much booze on Friday
    nights. They don't seem to realize that what goes up also comes down.

    They didn't think it would be this wild. But it can. When I did EMC runs
    at CKC near Mariposa a saloon fight broke out. A real one, guys flying
    across tables, glass crashing, beer everywhere. All the tourists ran as
    fast as they could. And the music kept playing.

    Wow!
     
  20. Joerg

    Joerg Guest

    Yikes. He must have been a character, and probably not unknown to them.
    With some marriages I wonder how they could hold on that long.
     
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