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Re: ELECTRONIC BALLAST?
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.
> 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.