Summary
Mains Voltage is filtered by L1 and a 0.1uF capacitor.A 0.82 Ohm resistor is also provided and is probably fusible.It is then rectified by the bridge formed by D1-D4 and filtered by a 10uF capacitor.As power is first applied, a 100nF 63V capacitor begins charging through a 820K resistor. Once this capacitor reaches 32V, the DIAC breaks over turning on Q2. Power then flows through Q2, the top winding of T1,L2,a filament of fluorescent bulb FL1, a 4.7nF capacitor,the other filament.
4mm in between where the coil is wound.L2 is 150 turns of 25-30 AWG magnet wire on an E core with a 1mm gap precut in the center leg of one of the halves. The center leg measures 6 x 2.5mm in thickness. The outer legs measure 6 x 2mm. When the halves are put together, they are 13mm wide and 12mm tall.T1 is a tiny ferrite toroid with a 3mm hole, 6mm total diameter and is 3mm thick. Each of the 3 windings are 3 turns, counted in the usual way by the number of times the wire passes through the hole.
