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  1. Um...Me123

    Quick fan speed question

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

    DIODE QUESTION

    Um....I don't know??
  3. Um...Me123

    DIODE QUESTION

    Here's my project: I have 2 circuit boards from an old remmote control car.  It was the type where you control both wheels individually.  Forward and backward for each. So there are 4 wires going to 2 motors (which I cut off)  the voltage reverses for forward and backward.  What I'm going to do...
  4. 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...
  5. Um...Me123

    WIRE GAGE --Big Chart

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

    Car touch sensor!

    So will the first one work at all with that short in there? Both the pages that had these, which were published (to the web) in different years, said if you got close (not touch) it would work.  Hmmmm?  They both are for connecting the circuit to a metal object such as a doorknob.
  7. Um...Me123

    Car touch sensor!

    Note:  I'm completely ignoring the speaker/led portion of the circuit. I just been looking around at different sensors and I found these two circuits.
  8. Um...Me123

    Car touch sensor!

    How large of an area can a touch lamp sensor control?
  9. Um...Me123

    Wattage lowering

    What's a What compared to a watt? http://www.circuitcity.com/ssm/Jensen-In-Dash-CD-Player-MP7610-/sem/rpsm/oid/120408/catOid/-13089/rpem/ccd/productDetail.do
  10. Um...Me123

    Wattage lowering

    I want to put a new sterio and speakers in my boat.
  11. 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...
  12. 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...
  13. Um...Me123

    Car Amp!!!

    I believe it was 25 amp.  Does that mean it can draw potentially up to 25A?!  Well...a safe ammount slightly below it. This is the amp my friend bought: http://www.bestbuy.com/site/olspage.jsp?skuId=7315522&type=product&productCategoryId=cat03085&id=1118843709770 It doesn't really...
  14. 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...
  15. 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...
  16. Um...Me123

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

    I have a "What hapened?" question: I was powering my inverter with my PSU (you know what I'm talking about audioguru) and as I turned the knob up i started to hear the buz of the inverter then the wire came on dimely with a loud buz then a little higher voltage and the wire came to full...
  17. Um...Me123

    LM317 Variable power supply

    I guess you misunderstood me.  The supl yto the fan and meter do not go through the LM317.  I know 38 is way to high thats why I was asking about the resistors.  I thought the 38 might drop down when a load was put on the regulated portion.  Anyway...I think I figure it out myself. Thanks anaways
  18. Um...Me123

    LM317 Variable power supply

    Wow everything you said there was very confusing.  I need 5V @ 110mA for the fan and 9V (8-12) at 1mA for the meter (but it's not working (see other topic))  The fan is a 40mm and fits nicely on top of the heatsink (to give you an idea of heatsink size) So I don't believe heat is a problem.  I...
  19. Um...Me123

    LM317 Variable power supply

    Hi all.  I was the one who put the LM317 in backwards and blew it and the pot up  ;D ::).  Anyway I got new parts and finally put it together and got it working.  I want to power a fan and a voltimeter in the unit but I don't know what to base my resistors on.  I have a pre-regulated wire that...
  20. 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?
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