Amplifiers – With semiconductor amplifying device – Including protection means
Patent
1978-09-22
1979-11-06
Dahl, Lawrence J.
Amplifiers
With semiconductor amplifying device
Including protection means
325362, 330207P, 330297, H03F 304
Patent
active
041737407
ABSTRACT:
A speaker protection circuit comprises a detection circuit connected to the output of a power amplifier circuit and detecting overvoltage exceeding a predetermined level developing at the output, and a first relay circuit to disconnect a loudspeaker from the output of the power amplifier circuit when the detection circuit detects the overvoltage, the speaker protection circuit further comprising a second relay circuit which causes a power supply circuit connected with the power amplifier circuit to drop or cut off the supply voltage to the power amplifier circuit when the overvoltage develops at the output of the power amplifier circuit. The second relay circuit has normally closed contacts connected between a secondary winding of a power transformer of the power supply circuit and a rectifier circuit. In order to drop the supply voltage to the power amplifier circuit, a resistor is connected in parallel with the normally closed contacts.
REFERENCES:
patent: 3735203 (1973-05-01), Fujie et al.
patent: 3818366 (1974-06-01), Arimura et al.
patent: 3835412 (1974-09-01), Honda et al.
Matsuoka Tadataka
Nagata Yuuichi
Dahl Lawrence J.
Nippon Gakki Seizo Kabushiki Kaisha
LandOfFree
Speaker protection circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Speaker protection circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Speaker protection circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-463502