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Thursday, September 10, 2009

Simple Inverter Circuit for Florescent Lamps

This is the design for simple inverter circuit. This circuit is very easy and inexpensive to construct, reliable, and enough powerful to light up a 15 W florescent tube lamps. This circuit is based on a transistor NPN bipolar. This is the figure of the circuit.


The only hard-to-find piece of this baby is the so-called yellow inverter transformer. It's a miniature high frequency transformer that has a 25mm x 20mm x 5mm ferrite core, 30 turns of primary, 15 turns of feedback, and 250 turns of secondary all concentric, wound on plastic frame than wrapped with a 'yellow' adhesive tape. The transistor that is used in the circuit is 2SD882. This is a single transistor oscillator circuit. Current passed through primary winding inducts a magnetic field to the core and the core gives the energy back to the feedback winding with a delay determined by the core material and windings. System then oscillates continuously on a frequency depending on this timing.

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