Comments on: Build a Great Sounding Audio Amplifier (with Bass Boost) from the LM386 http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/ Raspberry Pi, Arduino, and DIY Electronics Projects and Tutorials Mon, 22 Jan 2018 02:48:22 +0000 hourly 1 By: NOME http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-16559 Sat, 30 Dec 2017 13:43:21 +0000 http://www.circuitbasics.com/?p=843#comment-16559 Hi I was wondering about this amp are those mono amps?
and also due to you used the Lm386N-1 will this IC work with 16-32 ohm speakers?

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By: Velyx http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-16320 Thu, 28 Dec 2017 15:43:07 +0000 http://www.circuitbasics.com/?p=843#comment-16320 Where is the PCB layout / PCB diagram?

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By: Adinol http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-15696 Sat, 23 Dec 2017 19:56:51 +0000 http://www.circuitbasics.com/?p=843#comment-15696 You misunderstood the previous comment. You have to connect a 10µF 25V with negative pole connected to pin 3 of LM386. This means the positive pole of this cap is connected to the source of your signal, for example, a guitar. Then a 1K resistor from pin 3 of the LM386 to ground. Hope this makes is clear, without a revised schematic.

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By: Sanath http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-15602 Sat, 23 Dec 2017 03:44:26 +0000 http://www.circuitbasics.com/?p=843#comment-15602 What are the voltage of the electrolytic and wattage of reaistors

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By: Ryan http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-15583 Fri, 22 Dec 2017 19:57:45 +0000 http://www.circuitbasics.com/?p=843#comment-15583 In other words, connect pin 3 of the IC to ground with a capacitor and a resistor in series? Thank you in advance.

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By: Akmal http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-14396 Wed, 13 Dec 2017 09:59:38 +0000 http://www.circuitbasics.com/?p=843#comment-14396 Sir I have 4 ohm 2speakers so what amplifier I should use

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By: Meychele http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-13580 Sat, 02 Dec 2017 22:23:54 +0000 http://www.circuitbasics.com/?p=843#comment-13580 Hello,

I am working on a research paper for my senior design class at UCF. Would it be okay to use your LM386 audio amplifier with bass boost figure as a reference design in the paper? The figure will be cited appropriately. Thanks.

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By: VAneza ybanez http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-13103 Sat, 25 Nov 2017 06:45:10 +0000 http://www.circuitbasics.com/?p=843#comment-13103 It’s a very nice tutorial. Can I ask for the flow of the circuit? Thanks.

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By: fanzlive.com http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-11488 Mon, 30 Oct 2017 21:14:58 +0000 http://www.circuitbasics.com/?p=843#comment-11488 Many persons who are new to the world wide web, or perhaps
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By: Ryan http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-11261 Fri, 27 Oct 2017 11:54:15 +0000 http://www.circuitbasics.com/?p=843#comment-11261 Will it work with a guitar with two humbuckers?

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By: Lineman2208 http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-11109 Wed, 25 Oct 2017 16:58:41 +0000 http://www.circuitbasics.com/?p=843#comment-11109 A few questions. The bass boost and the gain pots are not connected to ground. Why? Also can I double this and make stereo audio?

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By: Thempleton Aart http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-9913 Thu, 12 Oct 2017 16:57:44 +0000 http://www.circuitbasics.com/?p=843#comment-9913 Decoupling means disconnecting two electronic circuit stages (against cc) from each other.
C4…7 aren’t for decoupling. They are there to short spikes and RF to ground. So they have to be considered as filters.

On the presented circuits an important capacitor is missing, the source input cc decoupler.
As in this circuit the input is directly connected to a op-amp, input decoupling is a must.
Risks are eventual continuous current coming from the source blows the LM386 IC, or worst case a problem with this amplifier circuit, causing continuous current flowing to the source, makeing hot-dogs of your connected smart phone. 😉
Never forget to decouple audio inputs.
In this case 10µF 25V with negative pole connected to pin 3 of LM386 and a 1KOhm resistor from ground to the same pin will suffice.

Hoping to be of some help.

Regards.

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By: Mark http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-9608 Mon, 09 Oct 2017 11:35:07 +0000 http://www.circuitbasics.com/?p=843#comment-9608 Hi, What type of capacitor is the blue 470pF ? can i use a different type ?

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By: geofrey http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-9187 Wed, 04 Oct 2017 16:51:56 +0000 http://www.circuitbasics.com/?p=843#comment-9187 have a problem with bass expander boosting

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By: Peter http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-9172 Wed, 04 Oct 2017 11:54:38 +0000 http://www.circuitbasics.com/?p=843#comment-9172 The 470pF capacitor is shown wrong in the diagram. It should be between pin 3 and GND, not pin 2.

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By: Rajesh http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-8466 Fri, 22 Sep 2017 16:35:14 +0000 http://www.circuitbasics.com/?p=843#comment-8466 I want to build a amplifier circuit for my new pair of 240watts speakers for perfect sound quality.please help me details .I’m just a bigener

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By: Cody http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-8414 Thu, 21 Sep 2017 15:40:35 +0000 http://www.circuitbasics.com/?p=843#comment-8414 Hey 😀 I build this circuit and it is AMAZING but my LM386N-1 is getting really hot and i mean VERY HOT. Is it normal or it is feeding to much power to the speaker or something? PS:I used 5v USB power for it.

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By: Jay http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-6682 Mon, 28 Aug 2017 17:54:47 +0000 http://www.circuitbasics.com/?p=843#comment-6682 Hi, could you let me know what your output Amperage and Voltage is? I’m assuming with the LM386N-1 you’re prob around 250-325mW but that seems way too low to find a speaker to attach too.

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By: Suman Dutta http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-5882 Sat, 12 Aug 2017 06:26:38 +0000 http://www.circuitbasics.com/?p=843#comment-5882 what should be the maximum watt of the speaker in LM-386 Model. Shall I get good quality sound for laptop?

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By: RickS http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-4719 Fri, 21 Jul 2017 22:38:51 +0000 http://www.circuitbasics.com/?p=843#comment-4719 How can you possibly know this (I just watched your youtube video) ?

They don’t teach this in school (Audio/Electrical Engineering) !

“The arm bone is connected to the, shoulder bone ?)

If I had your knowledge, what I am building would be, for the $$$, the best Audio System in the World !!

But since I don’t, it will be the second best Audio System in the World !!!

And a LM-386 Amplifier will play a small role within it…

Rick – SoCal

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By: Adinol http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-4366 Mon, 10 Jul 2017 09:12:14 +0000 http://www.circuitbasics.com/?p=843#comment-4366 Without trying to sound negative, in any way, this is a bit like saying, what’s wrong with my car, it makes finny noises?

If I were you I would rebuild the entire circuit with all the components replaced (including the chip and the speaker). If the goal is to have this done ASAP it doesn’t matter what’s wrong, as long as you get a working circuit.

Hope this helps.

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By: Mohit r http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-4365 Mon, 10 Jul 2017 08:25:31 +0000 http://www.circuitbasics.com/?p=843#comment-4365 Kindly help me
I’ve built the circuit Im experiencing lots of noise
I triple checked the circuit
I’m using a 25 ohms speaker is that the problem?
I have only 4 days from my deadline….

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By: Roger http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-4252 Thu, 06 Jul 2017 12:41:08 +0000 http://www.circuitbasics.com/?p=843#comment-4252 A 470 pF capacitor between the positive input signal and ground, which filters radio interference picked up by the audio input wires.
Hello sir!
I can’t see the above in the circuit diagram.
It connects between input negative and ground isn’t it?

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By: Pulkit Sharma http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-4209 Tue, 04 Jul 2017 18:58:30 +0000 http://www.circuitbasics.com/?p=843#comment-4209 6 or 8 ohm speakers

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By: Colby http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-4168 Mon, 03 Jul 2017 14:15:21 +0000 http://www.circuitbasics.com/?p=843#comment-4168 Hi, Is this amplifier have enough power to fill a 4m x 4m room?

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By: Ola http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-3859 Sat, 24 Jun 2017 11:16:12 +0000 http://www.circuitbasics.com/?p=843#comment-3859 Please send me the schematic diagram .
Rayjat51@gmail.com

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By: TULOA http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-3692 Thu, 15 Jun 2017 21:47:48 +0000 http://www.circuitbasics.com/?p=843#comment-3692 Apparently this circuit will not support any AC Adapters for 12V without some form of change to the circuit. You get a constant hum if you do and I have not yet found a way to fix this. Best to apparently just use a 12V battery or batteries in series if you need any higher than on here.

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By: Hemant chaurasia http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-3648 Mon, 12 Jun 2017 11:43:17 +0000 http://www.circuitbasics.com/?p=843#comment-3648 Sir,
what kind of speaker we should use.

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By: anil http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-3601 Thu, 08 Jun 2017 17:44:53 +0000 http://www.circuitbasics.com/?p=843#comment-3601 great amp …i want to ask you ..why did you connected a 470pf capacitor’s both pin on Ground..would?? you tell me plz..

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By: Harold http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-3389 Fri, 26 May 2017 23:43:18 +0000 http://www.circuitbasics.com/?p=843#comment-3389 Sorry! BTW the extended second circuit was great and worked the first time I fired it up. It is just the added bass control that I am having a challenge with…

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By: Harold http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-3388 Fri, 26 May 2017 23:41:07 +0000 http://www.circuitbasics.com/?p=843#comment-3388 I am having a problem with the extended bass circuit. It keeps distorting the signal and squealing, or cutting it out all together.

Any thoughts?

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By: Philip http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-3313 Sun, 21 May 2017 11:38:35 +0000 http://www.circuitbasics.com/?p=843#comment-3313 Hi,

Excellent tutorial.
If I was to replace the 3.5mm jack for a guitar jack would this work ok as a guitar amp?
I’m sure it would but wanted to see if you could see any problems?
Thanks.

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By: Andrew Gravlin http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-3216 Mon, 15 May 2017 21:36:39 +0000 http://www.circuitbasics.com/?p=843#comment-3216 Apparently also my other comment got lost… Any changes I would otherwise need to make for a 12V DC adapter? It is a 12v 400mA adapter from an old shaver. It currently has alot of hum on the line when its in use.

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By: TULOA http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-3215 Mon, 15 May 2017 21:16:58 +0000 http://www.circuitbasics.com/?p=843#comment-3215 Question for ya… My 9V in the circuit for the second setup is getting pretty hot. Is this normal or is something else going on?

Im using your: “A GREAT SOUNDING LM386 AUDIO AMPLIFIER” circuit.

The only change I made was a suggestion elsewhere to bump the capacitor from Pin 3 of the lm386 to the ground to a 50uF capacitor to help reduce more hum on the output. I am doing so to attempt to convert from 9v to 12v.

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By: Tuck http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-3145 Sat, 13 May 2017 01:07:18 +0000 http://www.circuitbasics.com/?p=843#comment-3145 You could use a small boost converter.

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By: Casper http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-2928 Fri, 05 May 2017 00:09:33 +0000 http://www.circuitbasics.com/?p=843#comment-2928 Hi, thanks for this post. I just want to ask if this is an active or passive loudspeaker?
Many thanks.

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By: Victor Faucheret http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-2690 Mon, 24 Apr 2017 05:20:22 +0000 http://www.circuitbasics.com/?p=843#comment-2690 This is the best project with an LM386 I have seen in the Web, for many reasons – very professional and cool, and yet easy for newbies. I have been trying to have the parts list sent to my e-mail address but to no avail. I just don’t get it. Would you please help? Thanks in advance.

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By: Kev http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-2673 Sat, 22 Apr 2017 13:04:25 +0000 http://www.circuitbasics.com/?p=843#comment-2673 Excellent tutorial I managed to make the first two today and will work on the final versions next. You explained all this just at the right level so a newbie, as I am, could follow your process and understand it…well most of it a few more re-reads should nail the rest. Thanks again.

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By: POWER http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-2600 Tue, 18 Apr 2017 06:24:04 +0000 http://www.circuitbasics.com/?p=843#comment-2600 ok can i make two of them and then change it to be a stereo amplifier?? and how can I supply the source to all the circuits

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By: KLEATHISKY http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-2538 Thu, 13 Apr 2017 09:21:59 +0000 http://www.circuitbasics.com/?p=843#comment-2538 Can I use a 12V~0.8A power supply instead of a battery?
also what can I do to remove the Gain potentiometer and have only a volume one?

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By: Marius http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-2410 Mon, 03 Apr 2017 12:52:06 +0000 http://www.circuitbasics.com/?p=843#comment-2410 Hi, i don’t understand how the potentiometers are connected… in the image it doesn’t show where its goes for the Bass Boost , Gain and volume… can u explain please where the pins of each potentiometer goes ?
Another question, Orcad or Eagle for PCB Footprints ?! And what should the size be for each components ?

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By: Aravind http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-2381 Fri, 31 Mar 2017 12:32:30 +0000 http://www.circuitbasics.com/?p=843#comment-2381 Sir you can use a 3.5 MM AUX Cable which also known as auxiliary cable which is a valance in the market all you need to do is just to assemble the auxiliary cable as per instructions given in the auxiliary cable box and connect it to the circuit through the headphone jack of the cell phone or any other device

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By: DIYNoob http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-2355 Tue, 28 Mar 2017 16:32:39 +0000 http://www.circuitbasics.com/?p=843#comment-2355 Hi, I’m planning to try this, but with 2 speakers. So basically I’m gonna make 2 amps, one for the right channel and one for the left channel. My question is, how would the audio input be wired?

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By: Alex Goldman http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-2339 Sun, 26 Mar 2017 20:01:37 +0000 http://www.circuitbasics.com/?p=843#comment-2339 Is there a lower Capacitor i can use instead of the 1000µf electrolytic cap?

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By: Dekisugi http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-2307 Sun, 19 Mar 2017 06:00:13 +0000 http://www.circuitbasics.com/?p=843#comment-2307 I have tried this circuit and it worked. But I have a question about the gain of 20. Isn’t it too large, since the input from an MP3 player might be something like 0.5V. When multiple by 20, it becomes 10V which is larger than the battery voltage itself. How come the magnified signal is not clipped or badly distorted? Thank you.

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By: Stephan http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-2272 Mon, 13 Mar 2017 13:48:37 +0000 http://www.circuitbasics.com/?p=843#comment-2272 C6 / 470 pF surely does not have any impact, as it’s shorted to GND on both ends…

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By: Circuit Basics http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-2256 Wed, 08 Mar 2017 22:05:06 +0000 http://www.circuitbasics.com/?p=843#comment-2256 Hi Sunil, you can use another value, like a 0.1 uF capacitor. If you go too large though the bass will get really muddy sounding.

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By: Circuit Basics http://www.circuitbasics.com/build-a-great-sounding-audio-amplifier-with-bass-boost-from-the-lm386/#comment-2255 Wed, 08 Mar 2017 21:53:25 +0000 http://www.circuitbasics.com/?p=843#comment-2255 Anything 16V and over will work fine with a 9V supply

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