10 years — 15 ago, the industry was widely released table lamps with fluorescent lamps, designed for a voltage of 127 V. A today 127 V network was preserved only in rare homes. It is clear that the owners of these lamps was now “tied” to expensive and bulky step-down transformers. We offer our readers we developed and tested a device that allows you to include a 127-volt lamp in the network a voltage of 220 V without the step-down transformer.
Since the current flowing through the discharge tube with a power of 15 watts, do not exceed 0.12 — 0.3 A, it can be restricted with the capacitor C1 is a small capacitance (see diagram). Depending on the parameters of the inductor L1 (its inductive reactance can vary in certain limits) the capacity C1 have to pick a value such that the voltage Up 127 V. For this is the additional chain consisting of capacitors C2, NW, Their total capacitance around 0.5 UF. Through the resistor R1 there is a discharge of the residual voltage on C1 — C3.
The capacitors C1 — MBGN-1 to 200 V, C2, Sz — MBM 160 V, E1 — resistor, MLT-0,5.
Further details small in size and easily mounted in the base of a table lamp.
V. S. EZHOV, Vladimir EZHOV, Leningrad
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