2 W x 2 power amplifier(LM1877）circuit

Published:2011/8/8 9:07:00 Author:Fiona | Keyword: 2 W x 2 power amplifier | From:SeekIC

Shown in the figure,the circuituses on,under symmetrical structure and has two way signal which is added respectively to the two op-amp non-inverting input ends of LM1877,its output end’s external way is same with the input end: it uses 2.7 Ω resistor and 0.1 u F to form the high frequency filter circuit to prevent the high frequency of self-excited; coupling capacitor Co (470 u F) and load resistor ZL (loudspeaker:8Ω) concert the output power into voice to output, and the magnitude of Co and ZL circuit is also determined to the circuit’s lower-cut-off frequency fL,the relationship between this three is: fL=1／(2πZLCo),corresponding to the parameters in the figure,its fL = 42 Hz.



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