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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
The "electronic ballast" like in compact F-light, not only an inductor. It contains a small half-bridge SMPS (similar to PC supply), the working frequency from 40 to 100kHz. Need a ferrit-core output transformer, driver transformer (for push-pull driving and isolation), EMI-filter.On the output (serial with F-tube) also need a small inductor as ballast, but sometimes here You can find a capacitor.
The ballast uses the tube as a load to for the oscillator. When the tube is cold the oscillator provides usually 40kHz, while when the tube is already hot it delivers round about 20kHz. That is because of the change of the tube's impedance as a function of time and gas presure.
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