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Old 1st June 2004, 11:24 PM   #11
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Join Date: Mar 2003
Location: Lisbon, Portugal
Quote:
Originally posted by setmenu
Grounds....
As the amp has everything referenced to a virtual ground [half supply V] and the dac has a ground at battery negative.

You need to explain a little bit more for us to understand...

1. Only one battery?
2. How do you create that virtual ground?
3. The GND of the dac is connected to V- on the battery, where is the + of the Dac connected to? (this question may seam stupid, but I'm trying to understand how many batteries do you have and how you connected them).

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Old 2nd June 2004, 12:34 AM   #12
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Join Date: Oct 2002
Location: Earth
Do I understand correctly that this resistor is generally used to avoid the pops & therefore does not affect sound quality?

TIA
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Old 2nd June 2004, 12:47 AM   #13
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Join Date: Apr 2002
Location: Germany, Clausthal
if it sucessfully prefends from pops, what it will do if it looks like a resistor to the electrons sitting on the cap, and is connected to ground, it will affect sound quality in so far the pops are gone. This may be a worse sound degradation, as a pop is sound and no pop is obviosly less sound than one.

If you want improve the sound further, you will find loads of ways how on this board, one is laying a stone as near to the cap as possible.

There is nothing bad on those resistors, but it may be a bad experience to connect a charged cap to the input of a cranked up hifi system.
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Old 2nd June 2004, 01:03 PM   #14
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Join Date: May 2002
Location: UK
Quote:
Originally posted by carlosfm



You need to explain a little bit more for us to understand...

1. Only one battery?
2. How do you create that virtual ground?
3. The GND of the dac is connected to V- on the battery, where is the + of the Dac connected to? (this question may seam stupid, but I'm trying to understand how many batteries do you have and how you connected them).

Hi Carlos
The power supply is series pack of 8x1.2v nimh cells.
The virtual ground for the amp is created using a 3 terminal monolithic device from TI, the TLE2426.
The Dac is fed from the +- terminals of the battery pack and the
voltage regulated according to component needs.[8v,5v]


Cheers


Setmenu
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