Recent content by wingman358

Also take a look at www.Mcmaster.com they have a ton of parts for all sorts of things and its organized really intuitively in an easy-to-navigate way.

As Lok said you probably shouldn't rely on the PCBs for structure. If there is vibration in the system, you might consider addressing the vibration rather than trying to strengthen the PCB. You could look at isolating the PCB through dampers or other methods. Vibration of a part isn't...

Okay guys just want to follow up on all that was discussed here. I got my project to work without letting any of the magic blue smoke out :biggrin:. I tried diving into the NP junction theory stuff but that avenue was too complicated, and I really didn't want to have to buy some complicated...

Ok so my question of the voltage distribution arises again... intuitively I imagine the battery/supply voltage being divided evenly (or close to that) amongst each of the elements in the circuit, which must be wrong if what you're saying is true. I suppose what I am assuming about the LED...

6... why?

It's for a motorcycle brake light, so battery voltage which ranges ~12V to 14V

They're 20mA at 2V and the max anticipated supply voltage is 14V. So I can keep the 6 LEDs, drop in a current limiting resistor of R = 2V / 0.120A = 17 Ohms and I should be all good, no? I've read its not a good idea to run LEDs at their max rated continuous current, but I figure I'll be fine...

OK so an alternative circuit (assuming 12V supply) would be to just wire the 6 LEDs in series, and swap outliers? Would that distribute 2V across each LED evenly? or close enough to an even distribution?

Thanks for the ideas, I'm reading up on these buck babies now. I actually was originally designing for series wiring, hence the six LEDs (12V / 6 gives 2V over each, in theory), but an EE friend advised against it for the reasons mentioned above. Just curious though, how does one "match"...

Hi all, I'm working on an automotive LED lighting project in which the supply voltage is from the battery/alternator and so varies 12 to 14V. I'm trying to find a way to drop the LED circuit supply voltage that would be better than using resistors. Here's the current design: R1 = 100Ω R2 =...

Homework Statement Hi all! I'm working on a dynamics homework and have hit a wall here: "If the frictional moment at the pivot O is 2 N m, determine the angular acceleration of the grooved drum, which has a mass of 8 kg and a radius of gyration k = 225 mm. Ans: α = 0.622 rad/s^2 "...

Okay I managed to figure it out with the help of this website: http://www.batesville.k12.in.us/physics/PhyNet/Mechanics/Circular%20Motion/banked_with_friction.htm

I understand that, but I don't know how to do the set up an equation to solve. Could you draw a free body diagram of the car with the added force of static friction? I just can't visualize the forces...

Okay so I understand that the equation mg*sinθ = (m*v2/r)*cosθ indicates the force acting down the slope is equivalent to the force acting up the slope (hence, no acceleration up or down the slope and therefore no friction needed). Furthermore, if I understand you correctly, f_s = μ...

I apologize for being so inept, but I'm still lost. Can you show/tell me step-by-step how to get to the correct answer?