Re: ELECTRONIC BALLAST?

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

Original poster: "robert heidlebaugh" <rheidlebaugh-at-desertgate-dot-com> 

Ed : That sounds like an inverter power supply used to fire the tube with
high voltage like a Neon with out powering the fillament windings. The
circuit is probibly an oscilator with a high voltage trigger coil. The
capacitors should be current limitors.
        Robert   H
-- 


 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > Date: Sun, 08 Aug 2004 18:53:04 -0600
 > To: tesla-at-pupman-dot-com
 > Subject: ELECTRONIC BALLAST?
 > Resent-From: tesla-at-pupman-dot-com
 > Resent-Date: Sun, 8 Aug 2004 18:55:36 -0600
 >
 > Original poster: "Ed Phillips" <evp-at-pacbell-dot-net>
 >
 > 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.
 >
 > Ed
 >
 >