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1. Rfi Filter For Thyristor Controls
Appliances employing an SCR or a triac as a current, voltage, or speed control may cause radio-frequency interference. This kind of interference can often be eliminated by utilizing an external filter using the circuit. Inductor L, which may be a 100 uH choke coil (such as Miller No, 5250 which will handle 2A) and capacitor C, a 0.01 uF ceramic disc capacitor, form a low-pass filter which passes 60 Hz ac but resists passage of high-frequency transients. These components can be mounted inside an electric outlet box to which a single female ac receptacle is mounted. In the diagram, P represents the power-lie cord arid plug. The interfering appliance is plugged into ac receptacle J.
http://www.fun-home-projects.com/electrical_projects/​tools/​rfi_filter_for_thyristor_controls.html

2. Tvi Filter For Appliances Employing Universal Motors
Television interference caused by the universal motors used in vacuum cleaners, sewing machines, and other appliances can usually be eliminated by connecting a filter between the power outlet and the power plug of the offending appliance. In the filter circuit shown LI and L2 are 8.8 uH choke coils and capacitor C is a 0.05 uF paper-dielectric type with a dc breakdown rating of 2000V. The components can be fitted in an outlet box to which a single female ac receptacle is mounted. If the appliance proves faulty, simply solder a small disc capacitor (0.01 uF) across the ac terminals within the body of the appliance. A leaking power cable shield must be repaired at the point of leakage. Considering the reward of interference-free reception, this inexpensive, easy-to-build tester should prove a most worthwhile project. The filter readily passes 60 Hz ac but offers resistance to the passage of the high-frequency ripple generated by the motor commutator and brushes.
http://www.fun-home-projects.com/electrical_projects/​tools/​tvi_filter_for_appliances_employing_universal_motors.html

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