Loudspeaker protector. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Speakers
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The loudspeaker protector protects the loudspeakers from damage when both positive and negative DC voltages appear on any of the outputs of the stereo amplifier, and also delays their connection for a time longer than the transients in the amplifier that occur at the time of power-up.
The device is made on three transistors and is powered by a separate source of 45 V. The basis of the device is an electronic key on a composite transistor V2V3, in the collector circuit of which relay K1 is connected. The delay time for the operation of the relay after power is applied depends on the elements R6, C2 and, with the ratings indicated in the diagram, is approximately 2 s. When triggered, the relay with its contacts K1.1 and K1.2 connects the speakers to the outputs of the left and right channels of the amplifier.
The device is made on three transistors and is powered by a separate source of 45 V. The basis of the device is an electronic key on a composite transistor V2V3, in the collector circuit of which relay K1 is connected. The delay time for the operation of the relay after power is applied depends on the elements R6, C2 and, with the ratings indicated in the diagram, is approximately 2 s. When triggered, the relay with its contacts K1.1 and K1.2 connects the speakers to the outputs of the left and right channels of the amplifier.
The device uses a relay RES-6 (passport RFO.452.101).
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