Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Patent
1983-03-31
1985-10-22
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including particular power supply circuitry
330207P, 330267, 330298, H03F 326
Patent
active
045491470
ABSTRACT:
Disclosed is a load impedance detector for detecting a variation of the load impedance of a single-ended push-pull amplifier having a pair of first and second transistors, the emitters of which are interconnected by a pair of series-connected first and second resistors forming a first node to which the load impedance is connected. Third and fourth resistors are connected in series to the emitter of the first transistor to form a bridge circuit with the first resistor and the load impedance so that the third and fourth resistors define a second node therebetween. A voltage difference between the first and second nodes is detected by a differential circuit which is responsive to there being a simultaneous presence of a first state in which the detected voltage difference is higher than a first predetermined value and a second state in which the potential across the load impedance is higher than a second predetermined value for generating an output signal. This output signal is utilized for controlling the level of the voltage supplied to the amplifier to compensate for the impedance variation.
REFERENCES:
patent: 3500218 (1970-03-01), Burwen
Mottola Steven J.
Mullins James B.
Victor Company of Japan , Limited
LandOfFree
Load impedance detector for audio power amplifiers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Load impedance detector for audio power amplifiers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Load impedance detector for audio power amplifiers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-124189