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Old 18th April 2012, 09:25 PM   #1
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Default LM386

I'm thinking about making my first DIY amplifier. It seems like the simplest way to start would be with an LM386 style. However, I wondered how many watts my speaker needs to be if I'm using a 9V power source? Thanks for helping a novice.
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Old 18th April 2012, 09:47 PM   #2
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With a 9V supply I don't think that chip can produce 1 watt into an 8 ohm load - and that would be an overdriven, clipped, squarewave signal. Get the Data Sheet at < http://www.ti.com/lit/ds/symlink/lm386.pdf > and look at the graphs on the bottom of pg 4 to get an idea of what it can do under reasonable operating conditions.

Dale
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Old 18th April 2012, 10:06 PM   #3
mikje is offline mikje  United States
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A popular and quality chip might be an LM3886. You'll find a lot of info on it if you do a Google search. There are some kits you can by that use the 3886, and kits that use other chips.
Mike
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Old 19th April 2012, 09:51 AM   #4
AndrewT is offline AndrewT  Scotland
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I think the lm386 is directed to headphone driving, where typical sensitivities are around 90dB to 100dB/mW. That is about 10000times more sensitive than a domestic speaker.
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Old 19th April 2012, 03:13 PM   #5
johnr66 is offline johnr66  United States
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Here are a few chip amps tested at Vs of 9v (regulated) maximum power before clipping.
Click the image to open in full size.
*Don't use the LM386 with 4 ohm loads.
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Old 25th November 2012, 08:05 PM   #6
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Default Mini Compound Amplifier Using the LM386 Chip Amp

Quote:
Originally Posted by AndrewT View Post
I think the lm386 is directed to headphone driving, where typical sensitivities are around 90dB to 100dB/mW. That is about 10000times more sensitive than a domestic speaker.
Hello AndrewT. I hope that you are well. I hope to bring your attention to the thread in the Pass Labs Forum which is entitled " Compound Power Amplifiers". Please go to its post #33 for an application using LM386 as a model.
Brgds
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Old 11th December 2012, 05:20 AM   #7
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schematic diagram lm386 audio amplifier circuit
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Old 11th December 2012, 06:13 AM   #8
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Do you need a gain of 200? For line level inputs I find Av=20 to be more than enough.
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