Amplifiers – Hum or noise or distortion bucking introduced into signal...
Patent
1974-10-24
1976-03-16
Mullins, James B.
Amplifiers
Hum or noise or distortion bucking introduced into signal...
179 1A, 330 15, 330 30D, 330 85, H03F 126
Patent
active
039449440
ABSTRACT:
An electrical audio power amplifier is connected to receive an input informational signal from a pre-amplifying stage functioning with a transducer or pick-up device such as a magnetic phono cartridge or tape head and connected to supply a transformerless output to drive a speaker to create audio sound waves substantially free of distortion. An input differential amplifier includes a first input supplying the input informational signal and a second input supplying the output informational signal and providing a differential output signal to an output amplifying stage including a pair of intermediate amplifiers and a power amplifier to directly provide the output informational signal to the speaker. A second compensating differential amplifier includes a first input supplying the input informational signal and a second input having a variable tapped impedance such as a resistor supplying the output informational signal and providing a compensating output signal in response to sensed distortion which is summed with the differential output signal provided by the input differential amplifier to substantially eliminate distortion.
REFERENCES:
patent: 3676790 (1972-07-01), Beurrier
patent: 3825854 (1974-07-01), Pichal
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