Muting circuit for loudspeaker

Details Muting circuit for loudspeaker Muting circuit for loudspeaker

H - Electricity

01

H

348/39, 179/42,

H01H 9/56 (2006.01) H02H 3/24 (2006.01) H04R 3/00 (2006.01) H04R 3/02 (2006.01)

Patent

CA 1085741

ABSTRACT OF THE DISCLOSURE A muting circuit for loudspeakers is operable to dis- connect a loudspeaker from an amplifier immediately upon a power supply being interrupted. The muting circuit incluces an around- zero-volt detection circuit for detecting around the zero volt level of a commercial AC voltage. An RC time constant circuit is controlled by the output of the around-zero-volt detection circuit to either charge or discharge the capacitor in the RC time constant circuit only when the around zero volt level is detected. A threshold circuit is connected to the RC time constant circuit and operates a loudspeaker relay when the charge on the capacitor either exceeds or decreases below a predetermined level.

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