LOW VOLTAGE DRIVEN AUDIO SIGNAL AMPLIFIER

摘要

PURPOSE: To provide a low voltage driven audio signal amplifier which is capable of suppressing noise by shortening the path of an amplifier circuit without lowering separation performance even at of the right and left channels the time of emphasizing the low frequencies. CONSTITUTION: Each of the output stage amplifiers 11 and 12 of right and left channels is provided with each of negative feedback circuits 1 and 5 lowering the negative feedback amount of a low pass and each of switch circuits 2 and 4 selecting these circuits as the negative feedback circuits 1 and 5. Each of the output stage amplifiers 11 and 12 receives each of the outputs from each of right and left preamplifiers 18 and 19. By each of the right and left switch circuits 2 and 4, each of the negative feedback circuits 1 and 5 is selected. As a result, the reinforcement of the low pass is performed in each of the right and left output stage amplifers 11 and 12.