Loudspeaker protection circuit

Details Loudspeaker protection circuit Loudspeaker protection circuit

1977-03-31

1978-06-06

Olms, Douglas W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

179 1D, 361 58, H02H 328

Patent

active

040938220

ABSTRACT:
A circuit for connecting a loudspeaker combination having a treble loudspeaker to an amplifier with a control device for emphasizing the amplification in the range of the treble frequencies, comprising a positive temperature coefficient resistor connected in parallel to a fixed resistor. The parallel resistor combination is connected in series in the electrical connection means for the treble loudspeaker and substantially through the first-mentioned resistor has a value which during normal operation of the loudspeaker combination is smaller than that of the treble loudspeaker, and further has a temperature coefficient such that by exceeding of a permissible constant load voltage for the treble loudspeaker, its resistance value increases with respect to the treble loudspeaker such that the latter is not thermally overloaded. The fixed resistor limits the resistance increase of the resistor combination to a predetermined value.

REFERENCES:
patent: 3423636 (1969-01-01), Rowley
patent: 3529210 (1970-09-01), Toshio Ito et al.
patent: 3890465 (1975-06-01), Kaizu
patent: 3935511 (1976-01-01), Boulanger et al.

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