Does BTL configuration help in overcoming ground loop problem?

Discussion in 'General Electronics Chat' started by kthurst, Feb 7, 2009.

  1. kthurst

    Thread Starter New Member

    Jan 25, 2009
    7
    0
    Hello everybody,

    I was troubleshooting a noise problem which was probably some grounding problem (I strongly believe it is a Ground Loop issue). I used different Audio amplifiers, all of which were having noise problem. But when I use TS4984 there was obsolutely very very less noise. This IC has BTL configuration so grounding doesn't come into picture either in input stage or output stage. Where as in other ICs load should be tied to ground.

    My question is: Does BTL configuration help in overcoming ground loop problem?
    Can anyone pls explain.

    Regards
    Kthurst.
     
  2. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    The dinky little amplifier has hardly any output power so if there is any noise it will be at such a low level that you won't hear it. It also has a capacitor called Cfeed that cuts high frequencies.

    BTL gives almost 4 times as much power as a single output using the same supply voltage and same speaker impedance.
    BTL does not need the huge output coupling capacitor as is needed for a single output.

    A ground loop is mains hum that is heard in a high gain system like from a record player.

    Is your noise hum or is it hiss?
     
  3. kthurst

    Thread Starter New Member

    Jan 25, 2009
    7
    0
    Noise sounds like a motorboat. Also a similar kind of noise adds to the background noise while moving the mouse.
    We are running our module (which is very similar to a laptop) using a 24 V DC battery supply. We are not using mains.
     
  4. kthurst

    Thread Starter New Member

    Jan 25, 2009
    7
    0
    One more thing, though they have recommended Cfeed in their schematic we are not using it and we are getting very nice audio.
     
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