Re: ELECTRONIC BALLAST?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Ed Phillips" <evp-at-pacbell-dot-net> 

Tesla list wrote:
 >
 > Original poster: "Matthew Smith" <matt-at-kbc-dot-net.au>
 >
 > Ed Phillips wrote:
 > >Anyone have a clue as to the circuit of the ballast/power supplies for
 > >screw-in  fluorescent lamps?  Just cut a dead one apart and found more
 > >stuff than I expected.  Six diodes, 2 HV transistors, one diac, one PTC
 > >resistor, two inductors (one closed ferrite core with fairly heavy
 > >wire), two 22 ufd, 200V electrolytics and miscellaneous other resistors
 > >and capacitors.  A lot more stuff than I expected and that probably
 > >explains the RF interference they generate.
 >
 > There's some stuff at Repair
 > FAQ:<http://repairfaq.ece.drexel.edu/sam/flamp.htm#fb3> - includes bits on
 > electronic ballasts.
 >
 > Schematics at:
 > <http://repairfaq.ece.drexel.edu/sam/samschem.htm#schcfl1>
 >
 > Some (can't speak for all) 240V ac models may be run off 300V dc - first
 > stage in the one I had apart is just a bridge rectifier.
 >
 > Cheers
 >
 > M
 >
 > --
 > Matthew Smith
 > Kadina Business Consultancy
 > South Australia

	Thanks, I'll take a look.

Ed