INCANDESCENT_LAMP_LIFE_EXTENDER

Published:2009/7/14 12:26:00 Author:May | From:SeekIC

The cold resistance of an incandescent lamp is normally very low compared to its operating resistance. Each time such a lamp is turned on, the initial current is several times greater than its rated operating current. The life-extender circuit will work with any incandescent lamp that operates at a voltage of 1.5 to 12 V and a current of 1 A or less. Look up the lamp's normal operating current and, using an ammeter, set R1 so that the normal operating current flows to the lamp. Now, each time the lamp is switched on, the initial current will be limited to its preset value.



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