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-   -   What means by decouple (http://www.diyaudio.com/forums/chip-amps/110518-what-means-decouple.html)

Paswa 22nd October 2007 01:38 PM

What means by decouple
 
In datasheet of TDA2050, they said to properly decoupl INPUT1 and INPUT2 from ground.

CAN You explain "DECOUPLE" and how to do this.....I'm a newbie..,he!he!;) :eek: :angel: :smash:

peranders 22nd October 2007 01:44 PM

In this case, don't mix power ground with signal ground. Don't let currents in the ground coming from the speaker mix with the input ground. Take a look at the pcb layout in the datasheet. Do you see how the ground from the input meets the power ground?

marce 22nd October 2007 02:08 PM

Reading the thompson data sheet and having a look at thier layout, i would agree with Peranders, that it is actualy star grounding and not realy decoupling in the real sense, that Thompson are on about, it is a confusing use of terminology IMO.
Decoupling is when capacitors are used to electricaly isolate a pin from a ground (or two grounds from each other, not so much used these days) for generaly two reasons, one to provide a low impedance path for any noise at the pin, and in the case of supply pins to provide the instantaneous current required during fast switching (or large bass transients) for the small amout of time it takes the PSU to deliver the power itself.


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