for us automobile technopihiles

Topic: for us automobile technopihiles (Read 3029 times) previous topic - next topic

for us automobile technopihiles

Reply #30 – January 28, 2009, 02:04:33 PM

I also thought of using the valvestem directly when reading this. Today I've had a chance to think about it more and a sleeve of some sort would have to be put over the valve as the typical magnetic susceptibilty of stainless is relatively low and titanium, forget about it. Probably just as well from a service standpoint to have something that attaches to the stem in the normal fashion so that the electromagnetic (or otherwise) could be serviced separately from the valves themselves which could also be serviced/upgraded as needed.

No Scott, I know how to spell sp00ge.

...and it's Hall-effect!!

for us automobile technopihiles

Reply #31 – January 28, 2009, 02:33:28 PM

Seamen :D

for us automobile technopihiles

Reply #32 – January 28, 2009, 11:13:48 PM

Quote from: Cougar5.0;254123

No Scott, I know how to spell sp00ge. :rollin:

QUOTE]

whatever,, i just thought it was good triva and typical be typical, you dont answer the question. Ever wonder why you think the way you do,, you dont listen,,,,:flame:

all joking aside,,"Siemen" is a unit of measurement (s) which is the opposite of ohms.
G=conductance
Bc=Suseptance
Y= Admittance

The perspective of the above measurements are like when you say,,"i think it will handle the power but I cant explain why" I use Admittance a lot with work when getting to the bottom of reactive to apparent power ratios when laying out genset work.

oh well.

for us automobile technopihiles

Reply #33 – January 28, 2009, 11:28:29 PM

OK, I didn't get it, though I design switching power supplies for a living which use transformers/inductors (that I design) & MOSFETs etc, and never do I use the conductance or admittance term while designing. I do see the siemens unit (S) in MOSFET datasheets, but I generally ignore it as I'm most interested in Rdson & the various capacitive charges & gate threshold etc.

for us automobile technopihiles

Reply #34 – January 28, 2009, 11:42:23 PM

Quote from: Cougar5.0;254222

OK, I didn't get it, though I design switching power supplies for a living .

humm...check pm

for us automobile technopihiles

Reply #35 – January 30, 2009, 02:23:23 PM

OK, so a day after posting here, I'm reading a serial bus protocol for power management (not important), but at some point I came across (no jokes!) a command [COLOR="Red"]IOUT_CAL_GAIN[/COLOR] and the units it had listed were milliohms(?). I kept staring at it and thinking - that doesn't make sense, it should be the opposite of resitance.

Lo and behold, I was reading the "Errata And Change Proposals" for the next revision of the specification when I saw:

Quote

Linear Technology requests that the units of IOUT_CAL_GAIN be a conductance (siemens) rather than a resistance so that the need for
division is minimized.

I'm surprised it wasn't Siemens that made this request! :punchballs:

for us automobile technopihiles

Reply #36 – January 30, 2009, 03:17:39 PM

Quote from: Cougar5.0;254222

I design switching power supplies for a living

...and here I was thinking you were an ME! :confused:

for us automobile technopihiles

Reply #37 – January 30, 2009, 03:54:58 PM

Quote from: JeremyB;254524

...and here I was thinking you were an ME!

The I have to do to make a living these days!

I am a ME.

I design the connectors, heatsinks & specify thermal interface materials, design leadframes & printed circuit board using AutoCAD, Cadence Allegro (PCB) &/or PowerPCB & ProEngineer

I design the electrical circuit & magnetics using MathCAD, Excel, Magnetics Designer, PowerLogic &/or Cadence Concept HDL. This includes creating all the schematic symbols and part footprints if they are not already available

I also have to manually create the BOM, source low cost/high performance electrical parts, buy the parts (Digikey, Mouser) if not available in Asian factory & build the circuit board by hand here at home (I need to use a microscope to touch up the solder joints - oh, joy

Now I'm designing a "digital" version where I have to use Microsoft C++ & Code Composer (TI) to write and debug code, which I'm still learning :flame: This is why I was studying the Power Management Bus - so I will understand how the communication to the chip is done and learn the commands.

My head hurts!

for us automobile technopihiles

Reply #38 – January 30, 2009, 08:45:11 PM

whats really sick,, all that work is done for you already........ "cordex cxc controller"

for us automobile technopihiles

Reply #39 – January 30, 2009, 08:59:52 PM

Hmmm, will it fit in the 1 sq. in. of PCB space for the controller and bus connection and cost less than $2.50?