Search results

  1. Um...Me123

    Brightest LEDs on the planet?

    What has everyone found for the brightest LEDs out there? For white I know PhlatLight has one pushing 6000lm and LedEngin will have a 40 watt RGB approaching 2000lm.  Anyone know of brighter ones?
  2. Um...Me123

    FAULTY AUDIO CABLE TESTER

    Any ideas on what methods to use to check various lengths (max of at least 100') of audio cable for things that may cause line noise or cutting in and out?  I have some ideas but need help. What specifically causes line noise? Another question I have that may play a part in this is how do...
  3. Um...Me123

    infrared help

    I bought some infrared leds and phototransistors on ebay.  Hooked them up to a microcontroller board and  put them right face to face and no sound.  I looked with a video camera and the infrared was blinking.  Tried with a sterio remote and it did beep.  I know the emmiter can do 940nm and I...
  4. Um...Me123

    HP Scanner! ~5370C~ Click if you have one.

    Our HP 5370C scanner just died.
  5. Um...Me123

    LCD Panel Meter Making Me Very Mad!

    OK So I bought this LCD panel meter to measure VDC (20Max) and I hooked a 9V battery to the power leads and it said 0.00.  Great so I hook it up again 5 minutes later it didn't work and has never worked again.  Bought another one finally several months later (has to be ordered) and I just hooked...
  6. Um...Me123

    Couple AC questions

    Will having a EMI filter (IEC connection (120VAC)) help when used with a radio controlled circuit? ((The RC circuit activates relays with which the 120VAC travels.)) Can blade fuses be used on an AC current on only one wire?
  7. Um...Me123

    Car Alarm

    Just Installed a car alarm for my friend and saw that the basic way in which is works is very simple.  I want to build a simple system for my own car, which happens to be wayyyyyyy more prone to a break in than his anyway, using some shock sensors and possibly door detection (using dome light...
  8. Um...Me123

    Simple help with transistors!!

    I'm only 16 so try to deal with my only basic understandings and sometimes dumb questions. I need help understanding transistors.
  9. Um...Me123

    Quick fan speed question

    How does the 3rd pin on a cooling fan work to control the speed?
  10. Um...Me123

    DIODE QUESTION

    I just have a quick diode question. All I want to do is only let a 9VDC current flow in one direction!!  What kind of diode do I use??  I dont need to amplify or anything special.  Rectify? Zener? Switching? I really don't know the difference. If you want to write a whole essay about diodes feel...
  11. Um...Me123

    WIRE GAGE --Big Chart

    What does open air mean?
  12. Um...Me123

    Wattage lowering

    I want to put a new sterio and speakers in my boat.
  13. Um...Me123

    Car touch sensor!

    I want to make a sensor that is wires to the sheet metal of a car body that when touched can activate something such as a 555 or a piezo (to be determined later). How do touch lamps work? Can I apply this to a car body somehow? Any ideas? I don't want an alarm system to go off or anything but...
  14. Um...Me123

    ELECTRONIC NEGATIVE WAVE SILENCER

    I have heard (and seen in a movie) about devices that pick up a sound, invert it, and play it back out to create destructive interference resulting in silence.  Apparently this is how noise canceling headphone that Bose makes work.  I just want to try to make a small device that you can point at...
  15. Um...Me123

    Car Amp!!!

    Ok....Installing an amp and sub for my friend in his little beater  :P  Anyway he kept telling me about he heard something about drilling through his firewall.  I kept saying naw and you just run it off a 12V feed like a cig. lighter.  (My previous research was in the thought of putting speakers...
  16. Um...Me123

    Universal infrared on-off for almost anything?

    Is there an esy way to build a tiny remote that will turn on/off almost anything via infrared (capable) such as TVs, projectors, sterios, etc.? Is there a simple 555 driven frequency for an infrared LED?  I know different brands have different codes but I saw this little keychain remote that...
  17. Um...Me123

    Panel voltimeter broke!

    I have a panel mounted voltimeter (I think it's a 20V)  I snaped it into the panel and it wont work now and it did before?  What did I viberate lose or break?
  18. Um...Me123

    EL WIRE---if you know anything about it click here!!!URGENT...sorta

    Quick question:  I ran 1.5V more than recomended (at 1A besides ::)) into an inverter driving EL wire.  It was also only about 1/4 of the length of wire that came with the inverter.  It caused the TV in the room to go all fuzzy (didn't happen with a smaller power supply or the full length) and...
  19. Um...Me123

    Speaker wire question

    I have some extra speaker wire from a long time ago and I don't know the AWG.  I need to extend two 70W 4ohm speakers about 16ft. and 10ft.  One is about twice the size of the other but same wattage.  The provided speaker wire is a larger AWG than the extra I have but I also don't know it's...
  20. Um...Me123

    driveway monitor

    I need to make a driveway monitor that blasts a piezo indoors when someone comes in the driveway.  (I am making this for someone) their driveway is maybe 1000ft. long  or so.  I figure I could have a IR led powered with a 555 and bateries on side and the other side could have the IR photo...
Top