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| Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Posted to alt.engineering.electrical,sci.electronics.repair,alt.sports.baseball.sd-padres
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Another fluorescent nightlight dissected
"Lynn" wrote in message ... "James Sweet" wrote in message ... http://picasaweb.google.com/lh/photo...eat=directlink This cute little First Alert nightlight someone gave me a while back lasted all of 6 hours before it failed. The lamp is a small U-shaped hot cathode fluorescent made of tubing roughly 11mm diameter. R3 was burned beyond recognition but measured around 32K which may or may not be close to its original value and both cathodes in the lamp are open. All resistors are 1/4W except for R2 which appears to be a 1/2W fusible type. D1, D2, C1, and C2 form a half wave bridge voltage doubler. R1 and R5 discharge the capacitors when the unit is unplugged. R2 serves as the ballast, limiting current in the tube, while R3 and R4 provide current to heat the cathodes. Running the tube from DC can't be good for it under the best of circumstances but I would hope these typically last longer than this one did. now you know why someone gave it to you why don't you shut your ass up you ****ing ****? |
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