On the use of fluorescent lamps with burnt filaments. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Lighting
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Amateur radio magazines often published various schemes for using fluorescent lamps with burnt filaments. The author has tested all such schemes in practice.
Using the experience of these tests and a number of improvements, the author settled on the circuit shown in the figure.
Choke Dr1 must be used only with a corresponding power fluorescent lamp. If there is no such choke at hand, I suggest the following option: for a 20 (18) W lamp, connect two 40-watt chokes in series; for a 40 (30) W lamp - two 80-watt chokes in series or two 20-watt chokes in parallel.
Capacitors must be paper type KBG (I) or similar with an operating voltage of at least 600 V, since at the moment of switching on it is precisely such voltages that appear on them. This is what ignites the lamp. Then the voltage drops to 250-270 V, and the fluorescent lamp burns steadily.
The described scheme has one drawback: Once or twice a year, the lamp must be turned over (the signal is unstable ignition of the lamp). But the described switching circuit has a number of advantages: burnt out lamps are used, which are usually thrown away; the lamp is powered by direct current, which is good for the eyes; high durability (the author has some lamps that have been working for 15 years).
Author: O.G.Rashitov, Kiev
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