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  1. K

    Favorite method of assembling circuits at home?

    I left out some crucial information. I don't have a soldering iron so I'm including that in the start-up cost of any method that requires one. Yeah, I know...
  2. K

    Favorite method of assembling circuits at home?

    I am concerned about power. My solution generally needs to last about a year.
  3. K

    Favorite method of assembling circuits at home?

    I just got my MSP-430 (microcontroller kit with two micros for $4.30) and I' just awestruck by how easy it is to use. I am looking to make a few very low-power circuits here and there for my car. For example, one to lock the doors after 30 seconds when I press a button. What do you guys like...
  4. K

    What would you call this, in technical language?

    I'm an EE with a fried brain right now, how would you describe the device in the attached picture in technical language? So far I've called it a "double-jointed robotic arm with one joint affixed to a mounting surface". That sounds really bad and not descriptive.
  5. K

    Tube system without air

    Please, I beg PF to stick to the topic. I am simply trying to create a closed, fully bled loop of water without a reservoir. I have plenty of reasons for not wanting a reservoir. I should not have to fully explain how a computer water cooling system works to get help. This is essentially...
  6. K

    Tube system without air

    I'm sorry if I sounded angry or anything, your explanation of tubing for radiation will be a good read for anyone who happens to read this thread who is trying to design that. Ideally I do no want a reservoir at all. I would like a completely closed loop, with no air and only enough water to...
  7. K

    Tube system without air

    Don't make such bold assumptions. Do you know how a watercooling system works? The whole idea is to concentrate and direct the heat transfer. Tubing is meant to carry the thermal interface (the liquid/water). One component in the system is the radiator, which is designed to radiate heat from...
  8. K

    Tube system without air

    There should not be any air at all. The tubing itself is flexible enough to handle the expansion. Air ruins water pumps.
  9. K

    Tube system without air

    No. The liquid is what carries the heat in this application. It doesn't matter at all if the tubing itself is a good insulator or not. What matters is the amount of water flwoing through.
  10. K

    Tube system without air

    What I am trying to do is streamline a water-cooling system for a computer I plan to build. But a forewarning to others: Please, don't discuss computers here. This is about tubing. It really only involves a pump, radiator, and 'block'. I'm not sure what the pressure is, but the...
  11. K

    Tube system without air

    I want to design a tubing system using flexible PVC (1/2" diameter) tubing that carries water in a loop. Obviously there is a pump too, but that's not the focus here. What I want is a way to get all the air out, so that the loop contains only water. There is the idea of a "fill port", where...
  12. K

    Airflow in a computer.

    So essentially what I should be looking for is a configuration to pass the most molecules of air through the case. I have two plans: 1. A case with two top exhaust fans and air inlets on the bottom for air to be sucked in. 2. A case with one exhuast fan on top, and one intake fan on the...
  13. K

    Airflow in a computer.

    My DC Fans run at pretty constant speeds, if that could help my problem any. I'm aware that high CFMs are unrealistic inside of a case. I think what you are saying here is basically the result of how I model the airflow in my head. I also have kinda figured out that I may be taking the...
  14. K

    Airflow in a computer.

    This whole 'stack effect' has me confused. It appears to just be a synonym for convection. How is a blower different from a propellor fan? Also, are blowers noisy? Does 'double the pressure' mean double the airflow? For instance, if there was a marble in the middle of this 'box' just...
  15. K

    Airflow in a computer.

    I don't understand the 'stack effect'...The link you provided is titled "Convective Flow due to the Stack Effect"...but it seems like it IS just convection. Am I missing something?
  16. K

    Airflow in a computer.

    I am asking about airflow efficiency, not about troubleshooting a computer. There doesn't need to be any problem to learn about physics (fluid physics included). Please stick to the topic: Danger has established that airflow should be upwards. Say the box has one exhaust fan on the top...
  17. K

    Airflow in a computer.

    I see you are a computer nut like me. Not to sound stuck up, but we both knew that stuff before this thread was created. Crucial parts will always have more attention paid to them, but airflow efficiency itself in a closed "box" is what I am hoping someone will explain in a manner unconcerned...
  18. K

    Airflow in a computer.

    First off, I'm sorry if there is a more appropriate section for this. There is no section exclusively for fluid physics, and I am not really trying to engineer a prodct, so I posted this here. SO if you have to move it, go easy on me :smile: . Think of a compute as essentially a box with...
  19. K

    Can an AC signal light an LED?

    Rogue, thanks man! That helps a lot. I am thinking about posting in the Electrical Engineering forum asking how to do this, but I have a feeling I would just end up hearing it from you. Do you have an e-mail I can contact you at? I think I will need 3 LEDs per small speaker, and 4 LEDs per...
  20. K

    Can an AC signal light an LED?

    Oh there's probably many easier ways, but I like to mess around and build stuff, then I can feel more proud. I'll have pics if I ever get this project done. Also, I see what a Volume Unit does...where can I buy one? I can't seem to measure the electrical properties of the audio signal with...
  21. K

    Can an AC signal light an LED?

    Sounds a bit too expensive. I figured my poor music quality (128-bit mp3) and crappy old stereo woulda taken care of that! Nevertheless, how would I make a voltage amplifier (for use outside of this). Also, what kind of light bulbs would operate at around 3V and 2mA? (these are the values...
  22. K

    Can an AC signal light an LED?

    Okay...thanks, that does help. What about lighting an LED with an audio signal? I bought some red LEDs from RS a few hours ago. I plugged the prongs directly into an old stereo (the speaker terminals)...it lit, although very dimly. Although with the volume on full blast, it followed the...
  23. K

    Can an AC signal light an LED?

    Thanks cliff, that helps a lot! If I want to power, say, 4 LEDs the same way with the same signal, should I use a different sort of resistor, or wire them a certain way?
  24. K

    Can an AC signal light an LED?

    Sorry for being unclear, I understand now how simple it would be to connect an LED to the power wires. However, I think it would be awesome to have an LED get brighter as the sound gets louder, and be off when there is no sound. An important part I suspect to include would be that my head...
  25. K

    Can an AC signal light an LED?

    So how much would this all cost?
  26. K

    Can an AC signal light an LED?

    Okay...so what will this do? Make a flashing light?
  27. K

    Can an AC signal light an LED?

    Right over my head. Where do I find a 'rectifier'...
  28. K

    Can an AC signal light an LED?

    I am wondering this because my car has very nice looking speakers when viewed in the light, however in the car they don't get much light and you hardly even notice. LEDs are cheap lights...so I was wondering if there is any way I can use these, maybe even run them off the sound signal itself...
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