Electrical Projects 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.

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October 6, 2008