"Andy Cuffe" wrote in message ... | I had my fluorescent work bench lamp apart today to try to stop an | annoying intermittent buzz from the ballast. It's a typical two 15W | tube with separate series inductor ballasts for each tube. | | I was surprised to see a 4.7uF cap in series with one of the ballasts, | but not the other. I'm wondering why they would have put a cap in | series with only one ballast? The only thing I can think of is that | it might cause one tube to operate 180 deg out of phase from the other | to reduce flicker. Might also improve the power factor of the whole assembly. They don't usually bother with small lamps however. N |
"Andy Cuffe" wrote in message ... I had my fluorescent work bench lamp apart today to try to stop an annoying intermittent buzz from the ballast. It's a typical two 15W tube with separate series inductor ballasts for each tube. I was surprised to see a 4.7uF cap in series with one of the ballasts, but not the other. I'm wondering why they would have put a cap in series with only one ballast? The only thing I can think of is that it might cause one tube to operate 180 deg out of phase from the other to reduce flicker. That's exactly what it does, this is a lead-lag configuration, the tubes flicker alternatly to reduce overall flicker. The same basic arrangement is used in preheat F40 twin tube ballasts. |
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