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jclark2021 18th April 2012 09:25 PM

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.

dchisholm 18th April 2012 09:47 PM

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

mikje 18th April 2012 10:06 PM

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

AndrewT 19th April 2012 09:51 AM

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.

johnr66 19th April 2012 03:13 PM

Here are a few chip amps tested at Vs of 9v (regulated) maximum power before clipping.
http://www.jracrylic.com/cpf/chipamp.jpg
*Don't use the LM386 with 4 ohm loads.

Antoinel 25th November 2012 08:05 PM

Mini Compound Amplifier Using the LM386 Chip Amp
 
Quote:

Originally Posted by AndrewT (Post 2991735)
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

jorge morales 11th December 2012 05:20 AM

1 Attachment(s)
:) schematic diagram lm386 audio amplifier circuit

sofaspud 11th December 2012 06:13 AM

Do you need a gain of 200? For line level inputs I find Av=20 to be more than enough.


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