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  1. J

    My Lab

    Not a robot arm: it's a Trek 5000 road bike. The scope is a Tek 2246, 100 MHz, 4 Channel.. The PSUs are (from l to r) 50 V 1-3 A, 15 V 1-3 A. It's a cool shop. I like it. :-)
  2. J

    My Lab

    Here's my lab (it's got some other stuff in it too:-)):
  3. J

    Millipede project question

    Thanks for the link. The motors I want are out of stock :-( but the prices are good (even after conversion from Euros to dollars). I'll check back with them...
  4. J

    Millipede project question

    They make 'em smaller. Here's one that's 2/3 the size of the one in the link I sent, but costs $1 more each. http://www.mpja.com/productview.asp?product=12342+MD. The millipede project specs call for 16 of these motors. I was trying to keep the cost low. --s
  5. J

    Millipede project question

    I found some of these pager motors here: http://www.mpja.com/productview.asp?product=12343+MD
  6. J

    IM NEW

    Ah, heck. Don't sweat it. I was really just giving MP (the moderator) a little jab just as a little joke. Welcome to our forum!
  7. J

    IM NEW

    There are a lot of great articles on this site. Start with "articles" from the main page, and especially this one: http://www.electronics-lab.com/articles/basics/theory/index.html. Plus ask questions in the "Electronics Chit Chat" forum. This section is specifically for questions about the...
  8. J

    Millipede project question

    Okay, cool. Well, I have seen vibrating motors in the various electronics catalogs. So now I know what to look for. Thanks.
  9. J

    Millipede project question

    I have a question about the millipede project (http://www.electronics-lab.com/projects/games/002/index.html). What the heck are "PagerMotors" and where do I get them? Thanks!
  10. J

    WOW... look?

    True, but they have an extensive selection of identical footcare items ;-)
  11. J

    pc Speed Test

    It took 2:22 on my 3GHz HP nx9110 laptop. 1GB RAM.
  12. J

    Help: Purchasing a Digital Multimeter and Soldering Iron

    A 15W soldering iron is fine for most PCB applications. I have one from Radio Shack I bought for about 8 bucks. I've replaced the tip once. It's been a good soldering iron.
  13. J

    Mystery voltage on input pins of 7408N (AND)

    I got it now. Thanks for the help. The only reason I decided to use a 7408 is that's all I have on hand. Thanks again to audioguru for the help. Somehow all of the great advice in guru's posts boiled down to "connect a 270 Ohm resistor between each input pin on the TTL Gate IC and ground."...
  14. J

    Mystery voltage on input pins of 7408N (AND)

    Okay, I'm just going to have to play the "I'm an idiot" card here and ask exactly what the heck to do to wire up this 7408 AND gate. I've got +5 VDC going into Vdd, and Vss wired to ground. I want to use as inputs +5V or nothing. However, it doesn't seem to matter what I run in, since there is a...
  15. J

    Mystery voltage on input pins of 7408N (AND)

    Thanks, guru. I'm recently getting back into electronics after a long break (since college - about 15 years). I discovered after I purchased 10 ea. of the 74xx series (AND, NAND, OR NOR, XOR and hex inverters) from Jameco that they're old, cantakerous TTL gates. That being said, you're saying...
  16. J

    12 Key Matrix Encoded Keypad Question

    They're electromechanical, and work just like the picture Ante posted (except the pic he posted was for a 16 key, but conceptually no big diff...a 4x4 matrix versus a 3x4). The problem I'm having now is my AND gates (to produce a signal that corresponds to the exact switch in the matrix that...
  17. J

    Mystery voltage on input pins of 7408N (AND)

    In building another project I need to whip together some AND gate logic. Basically I want to produce high output if and only if my two inputs are high. Easy stuff, right? Everything seemed to be going well, but my output wasn't what I expected. In diagnosing the circuit (I stripped it down to...
  18. J

    12 Key Matrix Encoded Keypad Question

    Thanks, Ante. Then combine the output pins on the keypad with some AND gate logic and I should have it, right?
  19. J

    What should I look for in a breadboard to buy one?

    1. Size of the board (number of 5x rows of holes, and the number of +/- bus holes) 2. Price 3. Number of power connections Other than that, I don't know really what else to tell you. Breadboards pretty much are all the same except for the above 3 things.
  20. J

    How does computer signals are getting captured by the others?

    How old is your computer, and when did this start happening? It's probably nothing. Or you could be the subject of an FBI probe. Maybe even Homeland Security. Just kidding. It's probably just your neighbors. ;-) Nah, relax. You probably have nothing to worry about.
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