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Old 3rd November 2010, 03:32 PM   #11
Pano is offline Pano  United States
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Yes, what Andrew says.

The headphone amp "may" give you enough clean output voltage, or it may not. Current won't be a problem here. Find a headphone amp you like and we can take a look at it.
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Old 3rd November 2010, 05:06 PM   #12
RobertE is offline RobertE  United States
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Quote:
Originally Posted by panomaniac View Post
Yes, what Andrew says.

The headphone amp "may" give you enough clean output voltage, or it may not. Current won't be a problem here. Find a headphone amp you like and we can take a look at it.
I tried using the tda2822 but the 20x gain is way more than I need. I think I only need about 2-3x. Because my source is basically line level when going into headphone amp, I need to attenuate it too much. I think the problem is that it is single supply running on 5v so I am bumping into the rails/limits. So I either need to use dual supply, or the 12v I have avail - but my 12v is not regulated and it may go as high as 15v.
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Old 3rd November 2010, 06:50 PM   #13
Leon08 is offline Leon08  Germany
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That's no problem.You don't need tda2822 for this.You need a simple opamp like ne5532 or similar.Then you connect it to run with single supply and calculate wich gain you need.The are many info on this subject in web.
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Old 12th November 2010, 03:22 AM   #14
RobertE is offline RobertE  United States
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Originally Posted by Leon08 View Post
That's no problem.You don't need tda2822 for this.You need a simple opamp like ne5532 or similar.Then you connect it to run with single supply and calculate wich gain you need.The are many info on this subject in web.
I ended up adding an ic to generate -5v for the op amp. I tried using the 12v from the car directly in a halve bias mode but it caused alternator whine. Problem was the neg voltage ic I bought worked at 8kz so more whine. I have a substitute on order. We'll see what happens...
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