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Old 14th July 2013, 09:21 AM   #1
diyAudio Member
Join Date: Jul 2013
Default [Need Help] Circuit optimization

Here is my circuit : http://i.imgur.com/lKVvEWB.png

The original idea was mixing 2 audio using 741 with 3 band equalizer. But I change the IC to 386, adding mic as input, 6 band equalizer, power amp to make sure there is enough supply to the speaker, also others enhancement. Any idea to make the circuit works better, with less noise to make it sound better? Or any other idea that I can add to this project. Thanks.
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Old 14th July 2013, 10:04 PM   #2
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The LM386 is the wrong IC here. It is a (low power) power amp, not a preamp. Redesign using TL072, TL082 or NE5532, Also, draw your schematic using the standard triangle symbol to make reading it easier. E
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Old 14th July 2013, 10:14 PM   #3
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Location: The Jurassic Coast, England. GB
Also configure Q1 and Q2 correctly, they should be a complimentary pair, (not the same type).
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Old 14th July 2013, 10:28 PM   #4
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Thanks for the input. I must be misunderstand about op amp. Because i though low power gonna produce less noise. For the design, since there is no LM386 in multisim component list, thats why its not triangle symbol. Im gonna redesign it using NE5532

@JonSnell Electronic

Thanks, I miss that part.

Also, is it needed to put more capacitor to get rid of DC component? Where to put it if its needed?
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