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homemade rapid-start fluorescent lamp magnetic ballast.

homemade rapid-start fluorescent lamp magnetic ballast.

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As shown in the figure, this is my netizen's idea, using a 220 V to 380V autotransformer as the main body, three 220 V to 6 V isolation transformer as a filament heating transformer, I would like to ask how to choose the material?

Screenshot_20191226_012305.jpg IMG_20191213_103134.jpg -33f0c4d4b2e19966.jpg IMG_20191015_153053.jpg

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Filename:-33f0c4d4b2e19966.jpg
Album name:Men of God / 被照物
Keywords:Miscellaneous
File Size:342 KB
Date added:Oct 23, 2019
Dimensions:2464 x 1848 pixels
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Date Time:2019:10:24 00:32:08
DateTime Original:2019:10:24 00:32:08
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Make:HUAWEI
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Bottled lightning
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Oct 23, 2019 at 10:21 PM Author: Bottled lightning
Standard 2x40w rapid start ballasts have 280v open circuit and 4v fo the filaments, also the small caps are more like 0.01 uf however l think f36t8s are harder to start. The basic circuit is correct however you also need some series inductance. I would try 2x40 chokes in parallel in series with the incoming line and 1.5 uf for the main capacitor, you will probably need to try different cap sizes to get the correct lamp current (0.43a). If you use a toroidal transformer you can add your own low voltage windings.
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