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Old 19th August 2011, 10:16 PM   #1
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Default Lowering source voltage

Is there a good way to reduce the source voltage. I have a chip in my design that only allows an input of +/- 2.5V, however I just plugged in my source and the sound clips badly meaning I exceeded those limits. Using my phone as a source yields the exact same result when the volume is at max, reducing it returns the sound to perfection.

However unlike my phone the source I intend to use has no volume control so how can I attenuate it. Would it be as simple as putting a resistor in series?
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Old 19th August 2011, 10:18 PM   #2
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You can turn the volume down on the source.
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Old 19th August 2011, 10:21 PM   #3
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As stated above, that is not an option. There are no volume controls
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Old 19th August 2011, 10:23 PM   #4
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Quote:
Originally Posted by jtavrisov View Post
As stated above, that is not an option. There are no volume controls
Everything i own, phones mp3 players etc etc all have software volume controls on them.
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Old 19th August 2011, 10:30 PM   #5
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Two resistors in a voltage divider. If you don't know what voltage levels are involved you'll have to find the best resistor ratio values. Or you could install a potentiometer.
OT commentary: With digital sources, I tend to question whether these hot sources are really worth it, or just trendy audiophile fashion.
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Old 19th August 2011, 11:28 PM   #6
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Well I'm stuck with the source, in fact the whole project is because of this source.

As far as the voltage divider, the ratio is one thing but should I go for higher value resistors or lower values? The extent of my circuit analysis goes to DC analysis and just textbook examples.
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Old 19th August 2011, 11:44 PM   #7
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Lower values are generally better, but both the output and input will see the impedance, and you have to keep them happy. Myself, I'd probably try a 1k resistor to ground, find a suitable series resistor, and give it a good listening test. Replace with a 4.7k to ground if need be. I don't know your source; maybe its circuit gain could be reduced to suit your app.
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Old 19th August 2011, 11:48 PM   #8
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Okay thanks, I probably try to use the same two resistors to get a 1/2 voltage divider. Keeps it simple especially since its going to be amped afterward.
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Old 19th August 2011, 11:55 PM   #9
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That will work. I'm not opposed to hot sources, but it's important to keep them in the context of overall gain structure. As you've experienced.
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