Simple LM386 Audio Amplifier For Radio Projects
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- Опубликовано: 8 фев 2025
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Make a simple LM386 audio amplifier that you can use with most radio related projects. I use it as a replacement for the high impedance headphones.
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73, YO6DXE
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DX EXPLORER:
A channel with amateur radio related videos on: schematics, kit building, homebrewing and more.
I am passionate about amateur radio since childhood. I got back into the hobby in 2016, while living aboard my sailboat. I received my license in 2022. I like QRP mostly, experimenting with all modes. But I am old school, so I prefer SSB or CW.
#amateurradio #hamradio #electronics #pcbway
I use the LM386-4 you can get 1 watt out of these at 12v, look on the datasheet, I use the LM386-4 all the time, 73 Paul M0BSW
Thanks Paul. Ohhh yes I love those. The only problem Is that here in the online stores in Romania they just don't seem to have them. I didn't bother to order them from outside 😁😁 I think I only have one now in my parts box 😁 73 DE YO6DXE.
Nice project Ciprian. I make small boards like this and install them in the small speaker boxes from tossed out surround sound systems. They make nice little mini-amplifier project boxes.
Rob
I do the same. I had a bunch of them laying around from friends so I thought to use them for something... usually ended up as presents for friends ))) I kept two for me haha.
thanks a lot
I have just discover your channel
it is very nice
bests regards from France
Thank you as well Tony. I hope in time it will get better.. if I have a little more free time to make the videos ) 73 my friend. Greetings from Transylvania.
parabéns pelo projeto , um abraço aqui do brazil
Muito obrigado. Preciso projetar a placa PCB um dia desses, pois continuo adiando, mas é muito trabalho e pouco tempo livre, jajaja. 73, YO6DXE
Nice show and tell. I’ve read on some ham radio reflectors though that the venerable LM386 production is ceasing.
That is what I've heard as well. But thankfully we have more manufacturers today not just one... and there was only one that announced that 😀😀
@@dxexplorer glad to hear that, although, decades ago when dual gate mosfets ceased production we went to the ne602/sa602 and, even better, diode ring mixers for dc receiver and superheterodyne circuits.
What I love the most in the hobby... is that we always find a solution to a problem in a way or another. People always get inventive and most of the time amazing stuff comes out 😁
Those project look very nice.
Thank you. I hope from now they will look even better 😁. 73, YO6DXE.
Very nice project! :)
Thank you my friend. It sounds so nice with the Pititico )). Now I can take care of my EFHW antenna just as you do. 73
Good to see you back! N7ANH
Thank you so much. Ohhh I hope I will be back with lots more videos from now 😁 73 DE YO6DXE.
Beautiful project, congratulations!!! Just a question about R3 and C6, they are LPF @ 159kHz. Why do you use this filter on the line feed please? This 159kHz frequency is outside the range of the human ear, we only hear from 20Hz to 20kHz.
Thank you so much. The filter... well if we do calculations and simulations it may show something... but in reality it doesn't cut much of the high frequencies so is not as sharp as the calculations may tell... so is basically just some sort of rudimentary filter to help CW signals sound a little better. A better choice would be the use of inductors... but then a preamp may be needed before the filter itself. I will return with that version of the amp too pretty soon as I want to re-make an older video on the filter. That one is really sharp... 😁
Great idea Chip. I like that you are using pin 7 and the input is on the -ve pin, it helps to reduce the chance of positive feedback. I wonder if C9 should be connected to the other side of R3, ie to pin 6? That should provide better decoupling. Take care, 73, VK7IAN.
Thanks so much Ian. That is what I used to have before the resistor and the capacitor the other way around. But most people were saying that it doesn't do much of a difference so I left it like this. Also I used a 100nF cap in the past not 10nF as I have now. Maybe I should make the switch back again as is not that hard.
@@dxexplorer Hi Chip, that's interesting. Anyway, if you have say 100mw into 8ohms that's about 100ma going through R3. That will be at least a 1 volt drop which won't be filtered out by the 100n cap which could lead to instability. The 1000uF cap will help a lot with transients at audio frequencies. If you aren't having issues though, no worries. Just my thoughts. Take care and all the best, Ian
@@4youian I already made the change ))) Thanks so much Ian. I will replace the schematic tomorrow... I was busy with FT8 this evening haha. 73
TKS.... Brazil
Always a pleasure.. 73
Like!
Thank you my friend ... how is the Sputnik ? This week i will finish testing the rest of the coils for the other bands and update the article. All the rest of the info is there now ( updated info ). 73
@@dxexplorer
I'm building up little by little. In Brazil I have a lot of difficulty finding the parts. I'm digging to finish it. I got last week the LM386.
@@marciorainer4233 Glad to hear that. It's ok don't worry... until then I have the time to also finish updating the article )) 73.
Do you make the pcbs?
Unfortunately no. Well.. I do but homemade for me )). But I will slowly make a put gerber files into the downloads folders so people can order them if they want from PCB manufacturers.
@@dxexplorer i wasn’t planning on ordering, just commenting on how well made they are. Very impressive!
@justinelliott3529 Thank you. Just toner transfer method with heat transfer foil. Works like a charm. Not always from the first try ))) but is better than hand drawing.
@@dxexplorer thank you!
It's work as pre-amp or power-amp ?
Depends what power you are thinking about to have and what you plan on using it for. 0.5w is not exactly a power amp )) The most 1w with the LM386-4 is all you can get. Again... this one is more for radio projects... if you want a nice one with a little more power you can try a TDA2003 or TDA2030 for a bit more power. There are a bunch of schematics online.
@@dxexplorer yeh I want a sensitive power amp for radio projects.
Ahhh then this one should be ok.
C4 value and code please
C4 is 10nF... code 103... but you can also use 100nF also... code 104.
@@dxexplorer
Many thanks ❤️🙏
Always a pleasure. 73, YO6DXE.
@@dxexplorer
Actually I'm beginner in electronics. So if u don't mind help me:
your circuit work on 12v dc and my crystal radio set work on 3 v how can i run them together with 12v
@@dxexplorer
I appreciate it man 💕👌