AC power source filter for audio video electrical load

A filter for suppressing noise in at least first and second power lines used for electrically connecting an audio video load to an ac power source, comprising:

• a first inductor coupled to the first power line in series between the power source and the load;
• a second inductor coupled to the second power line in series between the power source and the load;
• and
• a capacitor coupled between an input side of the first inductor and an output side of the second inductor, wherein the inductors are characterized by respective inductances and the capacitor is characterized by a capacitance, and the inductances and capacitance are established for suppressing at least two predetermined frequencies in the power lines.

A filter for suppressing noise in at least first and second power lines used for electrically connecting an audio video load to an ac power source, comprising:

• a first inductor coupled to the first power line in series between the power source and the load;
• a second inductor coupled to the second power line in series between the power source and the load;
• and
• a capacitor coupled between an input side of the first inductor and an output side of the second inductor, further comprising a metal oxide varistor coupled to the power lines in parallel with the load at an input side of the filter.

A filter for suppressing noise in at least first and second power lines used for electrically connecting an audio video load to an ac power source, comprising:

• a first inductor coupled to the first power line in series between the power source and the load;
• a second inductor coupled to the second power line in series between the power source and the load;
• and
• a capacitor coupled between an input side of the first inductor and an output side of the second inductor, wherein the capacitor is a first capacitor, and the filter further comprises:
• a third inductor in series with the first inductor;
• a fourth inductor in series with the second inductor;
• and
• a second capacitor coupled between an input side of the third inductor and an output side of the fourth inductor, whereby the filter suppresses at least four predetermined frequencies.

A filter for suppressing noise in at least first and second power lines used for electrically connecting an audio video load to an ac power source, comprising:

• a first inductor coupled to the first power line in series between the power source and the load;
• a second inductor coupled to the second power line in series between the power source and the load;
• and
• a capacitor coupled between an input side of the first inductor and an output side of the second inductor, in combination with the audio video load.

A device for suppressing ac power line noise to an audio video load, comprising:

• at least first and second power lines configured for electrically connecting an ac power source to the audio video load;
• at least first and second inductors respectively coupled to the first and second power lines, each defining a respective input side and a respective output side for presenting an impedance to noise;
• and
• at least one capacitor coupled to a capacitor line, the capacitor line being attached to the input side of the first inductor and to the output side of the second inductor and protected from power surges by said second inductor for short circuiting high frequency noise.

A method for suppressing noise at the power supply input of audio video equipment coupled to a source of 60 Hz ac power, the source having a first power line and a second power line, comprising the step of:

• coupling a filter to the power lines, the filter having at least one circuit, the at least one circuit including:
• at least a first inductor coupled to the first power line in series between the power source and the load,
• at least a second inductor coupled to the second power line in series between the power source and the load, and
• at least a first capacitor, the capacitor being coupled to the first power line upstream of the first inductor, the capacitor being coupled to the second power line downstream of the second inductor, whereby noise surges and at least two noise frequencies in one or more of the power lines are suppressed by the filter.