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Figure 3-16.RC time constant chart.
The Capacitor Filter

Neets Module 06-Introduction to Electronic Emission, Tubes, and Power Supplies
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3-16 Figure 3-17.—Voltage drops in an inductive filter. Now back to our circuit. As illustrated in figure 3-18, when the current starts to flow through the coil, an expanding magnetic field builds up around the inductor. This magnetic field around the coil develops the cemf that opposes the change in current. When the rectifier current decreases as shown in figure 3-19, the magnetic field collapses and again cuts the turns (windings) of wire, thus inducing current into the coil. This additional current adds to the rectifier current and attempts to keep it at its original level. Figure 3-18.—Inductive filter (expanding field). Figure 3-19.—Inductive filter (collapsing field). Now that you have learned how the components in the filter circuits react to current flow from the rectifier, let's discuss the different types of filter circuits in use today.






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