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Chip Amps Amplifiers based on integrated circuits

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Old 3rd March 2010, 09:32 AM   #1
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Default LA4440 humming

myself jerin and i'm from kerala india could you help me with a problem. i'm trying to use a sanyo LA4440 based chip amp extracted from a car stereo to power up the center and subwoofer channel from my pc. my power supply is 6v-0-6v transformer with 3a bridge rectifier module i'm using stereo headset pin to take input from the sound card and i'm giving the inputs directly to the input pins of ic .my problem is that when i connect the speakers i get loud humming but when i touch the ground of the circuit the hum dissappear can you tell me what is wrong with my setup. i think u have schematics of the IC mentioned my sound card is onboard realtek supporting 5.1
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Old 4th December 2010, 05:50 PM   #2
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The gnd from your amplifier board should link to that of computer board through the pin you use at headset out at system.
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