| 摘要 |
PROBLEM TO BE SOLVED: To provide a headphone amplifier circuit capable of increasing an output amplitude by compensating for the effect of a parasitic resistance in the headphone amplifier circuit to improve channel separation. SOLUTION: The inverting amplifiers 22 and 26 including a negative feedback circuit having a resistance R2 amplify the audio signals Lch and Rch to be input to negative input terminals through a resistance R1 respectively and applied to the input edges of right and left headphones 12 and 14. When an amplifier 24 applys the predetermined potential voltage to the output terminals of the headphones 12 and 14, a central output terminal 18 of the amplifier 24 is connected to the positive input terminals of the inverting amplifiers 22 and 26 through a resistance R4 and the positive input terminals of the inverting amplifiers 22 and 26 are grounded through the resistance R3. COPYRIGHT: (C)2009,JPO&INPIT
|
