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Old 14th August 2012, 09:58 AM   #1
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Default INA217 is noisy

I am developing intercom communication on INA217 and TDA2030.
I have troubles with INA217. It's noisy.
You can see cirtuit in attached pdf file.
My device has 2 XLR inputs for 2 microphones and 2 speakers. Only one mic and speaker is active.
I tested equalizer and TDA2030 in my circuit without INA217 it works fine.
So INA217 is problem.
Power supply is 24V I also tested with two 9V batteries (18V total) again I heard noise in speaker. It means it's not power supply problem.
I use in my device CD4053 switch. Instead it I try to solder wire jumpers but again it's noisy.
Anybody saw same problem with INA217?
Thank in advance!

https://www.dropbox.com/s/44s1yvs2bt...m_20120707.pdf
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Old 14th August 2012, 10:23 AM   #2
DF96 is offline DF96  England
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Circuit diagram too small to read, but unexpected noise is often a sign of RF oscillation.
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Old 14th August 2012, 12:46 PM   #3
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Please download pdf file I guess in browser it's small. It should be good.
I heard white noise. Loudness of noise is same as my voice.
How to remove RF oscillation? Inductor on input? When inputs are shorted output noise doesn't fade.
I am hardware engineer. But usually I develp digital circuits.
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Old 14th August 2012, 02:29 PM   #4
DF96 is offline DF96  England
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Have you read the datasheet? It warns about RF oscillation under certain circumstances.
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Old 14th August 2012, 02:39 PM   #5
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Do you mean 47Ohm resistor and 1.2uH inductor?
Yes I saw it but I think it's not my case.
I connected together positive and negative inputs for test.
But I also hear noise when inputs are shorted by short wire.
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