Recent content by noid

Sorry for the misunderstanding: The second line is actually the derivative in respect to q of the first line (I forgot to put ' after T). Then from the second line I want to find what q is (after setting T to 0).

I have started with the formula. T = 0.5q+4q^(-1/2)+9/q I have derived and am trying to solve for q but have gotten caught up on how to solve when I have to subtract two variables with different base numbers and different exponents. Any ideas?

I had someone with the 4 cylinder version code plug take a picture of theirs (this one reads twice as needed with a 8 cylinder swap). The chip code on this one is: HML 087 9119 http://img593.imageshack.us/img593/1656/4cyl.jpg...

I think I have made a discovery! I know what is called the "coder plug" on the cluster effects how the cluster displays the tach because the car is a bmw e30 (e30 is the generation of 3 series bmw's from 1984-1991). The e30 came in 4 and 6 cylinder models, the tachometer will display correctly...

I could be mistaken, but wouldn't it be digital if the car is fuel injected, and the rpm signal is provided by a computer (ECU)? Would the chip still work if the signal was analog? AlephZero: Should I ground all the other unused pins also for the second d-type flip flop on the chip, or is it...

Will it work even if the incoming frequency is not constant?

Would I be able to use this chip: http://www.nxp.com/documents/data_sheet/HEF4013B.pdf It is within the range i need (3-15v). Excuse my ignorance but what does is "5 V, 10 V, and 15 V parametric rating" referring to? Is it ok to feed and output 12v? Would I get what I need if I...

Hi guys, new the forum! Long story short, I am doing an engine swap in a 80's 3 series bmw and need to make the tachometer read correctly. Currently the tachometer reads twice as high because the tachometer is made to read a 4 cylinder (now an 8 cylinder). Thus I need to divide the signal in...