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I've used a DAC0830 to connect with LM386 as shown in the schematic above.
I'm able to reproduce the voice I need correctly, but there is always this buzz that comes along with the sound.
It sounds like this :
Sound output from LM386
Can anyone advise me on what I can do to get rid of that buzz?
The LM386 is not a very quiet IC...It is actually very noisy and probably isnt suitable for what you want to use it for....
They use the LM386 for small Battery powered amps and they are used quite a bit in Distortion pedals because they are so noisy...
I would select a better audio opamp.....
They use the LM386 for small Battery powered amps and they are used quite a bit in Distortion pedals because they are so noisy...
I would select a better audio opamp.....
I have no idea how big is the output ac voltage of your DAC, but I'm sure that you don't need 200x gain for the LM386, that you've set with the 10uF capacitor between pin 1 and 8.
Leaving pin 1 and 8 floating gives a gain of 20, I think that would be pretty enough for your application, so I suggest to simply remove the capacitor between pin 1 and 8. (or any gain can be set between 20 and 200, just have a look at the datasheet of LM386...)
One more thing: the capacitor between pin 7 and GND is VERY useful against noises, do not ever skip it.
Unnecessary gain can easily produce disturbing noise.
Leaving pin 1 and 8 floating gives a gain of 20, I think that would be pretty enough for your application, so I suggest to simply remove the capacitor between pin 1 and 8. (or any gain can be set between 20 and 200, just have a look at the datasheet of LM386...)
One more thing: the capacitor between pin 7 and GND is VERY useful against noises, do not ever skip it.
Unnecessary gain can easily produce disturbing noise.
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