Recent content by japroach

  1. japroach

    Stupid atx question

    It sounds like you are describing the 4 pin molex connector. The two black wires in the middle are ground, and you should read voltages with your negative lead connected to them. The negative voltages supplied by your power supply are -5 and -12V, and they will connect to your motherboard...
  2. japroach

    flip flops

    http://computer.howstuffworks.com/boolean3.htm
  3. japroach

    Solder Fumes

    Just get an adjustable one they are maybe 20-40$.. Or you can use a light dimmer to reduce the power going into your soldering iron. I set a fan next to where Im working, if I dont the fumes rise straight into my mouth and eyes. Open any windows and doors in the room as well.
  4. japroach

    perfboards

    Yeah there are no connections on the board, those are just places to solder your component leads. What you do is place the two wires in two holes close to each other, and make a solder bridge, or just bend one of the wires over a little to make it easier. And if they arent close then you can...
  5. japroach

    LED driver

    I dont think thats what hes asking. What hes saying is why use a LED driver chip. Main reason is to have constant current output to a bunch of LEDs. Most of it explained here: http://www.siliconchip.com.au/cms/A_100966/article.html
  6. japroach

    circuit simulator

    For a transistor you can get a curve tracer that will give you a lot of info. For a capacitor/inductor/etc you have to use a freq and check its response at that freq. or do a sweep or something. The problem is interfacing with the computer. There is a box you can build to measure inductance...
  7. japroach

    Can I run two regulator circuits off one transformer secondary?

    Did you check if theres a fuse inside that you can replace?
  8. japroach

    Magnet switch and smart card reader

    "The third problem is about the AND-GATE because as soon as I remove the magnets the logic would go to 0 (0v) and I would not have enough time to open the door." flip-flop that is reset when the door is opened. Or it can be reset once your timer has timed out (count-down is activated by the...
  9. japroach

    OPTOCOUPLERS

    http://www.poweredparaglidingontario.com/news/caps_lock.JPG www.google.com
  10. japroach

    Free sample chips!

    Yeah I agree.. in the future you make be making parts decisions for your company. And if they have been kind to you in the past, you tend to favor them..  :) btw National stopped sending samples to all free/ISP/and school emails that I have. I would gladly pay the shipping, but they want...
  11. japroach

    Buy parts

    Local surplus or Ebay. And the last resort is the local electronics shop, I dont like to pay full price for basic parts...
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