lm4991+problem

Thread Starter

ekremhb

Joined Nov 9, 2009
2
I want make my mp4 player 3w sound amlifier whit
lm4991 and design my circut base of own pdf but I have not listen
any sound from speaker or not any sound what is the problem


Can you help me

supply voltage 3,7 lion cell speaker 8 ohm 3w

Regards
 

Audioguru

Joined Dec 20, 2007
11,248
The datasheet for the LM4991 shows that it works when its supply is as low as 3.7V but its output power into 8 ohms is low. It is only 0.7W at 1% clipping distortion which will be audible. Its output power at clipping (low distortion) is only 0.58W which is less power than a cheap clock radio. Its power output will be less as the battery charge becomes less than 3.7V.
 

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