| Home |
| Search |
| Today's Posts |
|
#13
January 31st 05, 06:25 PM
|
|||
|
|||
In article ,
Telamon wrote: In article , (Mark Zenier) wrote: In article , Al Arduengo wrote: If it says mfd it should mean mili-farads - not micro-farads. Nobody uses millifarads, except maybe the boom car crowd. "mfd" or more commonly "mf", prior to (the 1960's) metrification/SI rationalization meant Microfarads. And picofarads were "mmf" micro micro farads. Mark Zenier Washington State resident That's not what I see in most articles or catalogs. 1 F is 1 farad 1 mF is .001 or 1x10^ -3 or 1 milli-farad 1 uF is .000,001 or 1 x 10^ -6 or 1 micro-farad 1 nF is .000,000,001 or 1 x 10^ -9 or 1 nano-farad 1 pF is .000,000,000,001 or 1 x 10^ -12 or 1 pico-farad Many capacitors are in mF in industrial power supplies. Got to get the current step response down to 20 Hz in some cases. Man, I just dug out an older EEM (Electronics Engineers Master catalog) and it's a MESS. Even in 1993, some outfits were still using MFD for microfarads. Millifarads are probably an artifact of Globalization (ie. of the outfits that used MFD for uF in 1993 are probably now empty factories in the US midwest after all their equipment got auctioned off to somebody from Canton). Likewise nanofarads are pretty much of an indicator the your capacitor was made by a European based manufacturer. I'd only expect to see millifarads on big "Computer Electrolytics", those beer can size (or bigger) with screw terminals. The bottom line for project building hobbyists is that you need to take into account when and where the magazine article or book was written. There's a lot of stuff out there that's old enough to be really confusing. (Several years back, I had an e-mail converstation with a guy who was trying to find parts for a transistorized VLF reciever, and the writeup included how to use it for detecting atmospheric atomic bomb tests, which quit before 1963). Mark Zenier Washington State resident |
| Thread Tools | Search this Thread |
| Display Modes | |
|
|
Similar Threads
|
||||
| Thread | Forum | |||
| Electronics Club - Time to "pass the knowledge torch" | Boatanchors | |||
| Electronics Club - Time to "pass the knowledge torch" | Homebrew | |||
| Question Pool vs Book Larnin' | Policy | |||
| FA: Electronics Engineering education course - CIE | Homebrew | |||
| BPL Video On-Line | Policy | |||
Threaded Mode
