Hi Folks,
Has anyone a schematic of this LM386 module please?
This one was supplied via AliExpress.
Thanks

Hi Folks,
Has anyone a schematic of this LM386 module please?
This one was supplied via AliExpress.
Thanks

Look at the data sheet for the IC, many times they show a suggest circuit/layout.
If you had posted good flat pictures of both sides of the PCB, you'd have a schematic by now.
This. Look at a few LM386 circuits, this module won't be that different.
Then just draw your way out of this. I am not the only one here who has reversed a schematic out of a physical instance of device more than once, offa boards that make this one look what it is⦠tiny.
a7
I am aware of that, it is this module's schematic I was hoping for.
I was hoping that someone would already have the schematic. It would save time and minimise possible errors.
I've helped others in the past, to save them time and effort.
Have you used your search engine and looked for "schematic aliexpress LM386 module" You might find the one, many show up.
Yes, I searched before asking here. I just tried again and got this posting! ![]()
I also asked the AliExpress supplier, but no response as yet. Just gently chased them.
You may have to reverse engineer it. It is good experience if you have never done it before.
Sry. I didn't mean to imply that you are lazy, or that by now any time you've spent looking for a schematic would be some multiple of the time it would have taken for you to do it yourself, even if it would have meant doing something someone somewhere had already done.
Not to mention fun.
a7
I have done it before, just want to avoid that extra effort.
Iam
Thats why my engineering clients liked me, I found the least effort way of doing things ![]()
In case it is of use to someone else, I think this is the schematic.
There are question marks about some of the values as parallel paths made measuring the values difficult without removing components.
I am do not know why two caps are in series on the input.

The two capacitors on the input is strange, and unnecessary. Are you sure they are both capacitors?
C8 is probably 0.1uF. Electrolytic capacitors don't "act like" capacitors at high frequencies so a 0.1uF ceramic is often used in parallel at the power inputs to prevent high frequency oscillations.
The lack of documention is one reason I avoid AliExpress, Alibaba, eBay, unknown 3rd-party Amazon sellers, etc. ![]()
I find it strange that people still hang on to 50+ year old parts, like the LM741.LM35, L293, LM386, etc. The PAM8302 (click) or PAM8303 (stereo) is a much more modern class-D (digital/mosfet) version of that old LM386.
Leo..
Yes I agree. I checked over and over as I could not see why it was like that. From measurements I made I was surprised the two capacitors were different values - unless they had huge tolerances.
Life is full of strangeness.
If you look at the datasheet of the LM386 (the IC), you will find the recommended circuits that probably are very close to your module, or can help to understand the elements.
For example, in the page 12, 13...:

Thanks for your help, but close is not good enough for what I wanted.
And why do you need it? It's not performing as expected?
From your reverse engineering work it seems that it's almost the same, except that the gain is controlled with the pot between pins 1-8, as explained in the datasheet. And the input resistor R1 could be for an electret mic, that needs a small voltage.
Yes, that is for biasing an electret microphone.