Build the BEST LM380 audio amplifier
ฝัง
- เผยแพร่เมื่อ 5 ก.ย. 2024
- Get the best out of this nearly half a century old audio amp chip with proper design and circuit layout.
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Mail: PO box 362, Vandalia, OH 45377
Email: johnaudiotech@gmail.com
Thank You!
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As a cancer survivor, my thoughts and prayers for your brother. I really appreciate your knowledgeable content. Thanks!
When I was an electronics apprentice, (45 years ago), we used to build our bedroom stereo amplifiers using LM380's from work (!). It was soon discovered that they worked wonderfully in a bridge configuration into 8 Ohms, but this caused my father to get cross too often. LM386 pre-amp/tone controls, LM380 PA.
This sounds really cool. I've been considering trying to make a bridge coupled lm386 as a guitar amp, but now that I have some 380's, I might go for that instead.
HI John,, my Humblest apologies to you,, I didn't see the comment about your Brother having Cancer,, My best wishes to him and you from the bottom of my Heart!
This is my question how do you turn an amplifier down on the inside with no tuning pods your radio is turned down to one watt but still will not key the amplifier do you have any solutions
My thoughts and prayer to your brother, I do not know your brother but watching your channel I can imagine he was raised in a proper family and that means a lot to me.
All the best for your brother!, and keep it up man, he will recover!
Glad you’re back. Hope they sort out your brother’s cancer. Love the outtake at the end. By the way, I’ve taken to letting ads play out so you get paid half a cent more, or whatever. Anything I can do to make a diff...
John my thoughts are with you, your brother and family best wishes from across the pond Steve
All the best for your brother. Strength to your family. Good luck!
All the best to your brother!
When will the "Copyright Clowns" realize that 3 seconds of their song serves as a promo for they're own property?
Edit: Thanks so much for these videos John.
It's *their own property
It is not the owners it is their publishers and the payment/search systems. You have 3 main publishers :BMI,Ascap,Sesac who use advertising intelligence companies such as Tunesat , Numerator,BMAT, TRQK to detect any audio from their composers. It is all computerized and very accurate. Think of it as web crawling for music. Composers do not have a choice because in order to be paid you have to have a publisher to receive publishing royalties. So it is either play along or sacrifice 35 years of music lessons, learning to play 11 different instruments, learning to mix and master music,buying thousands of dollars of music gear, recording gear, paying for health,dental and eye insurance and very expensive copyright fees etc. Most composers make a very modest income. And on top of all that since the internet people feel that all music is free. If I steal a Taylor Swift CD at a shop I am arrested. If you steal my music on the internet I am the bad guy for trying to make a living. She can afford it. Most composers can't. So it is kind of backwards thinking.Their are tons of composers who do offer music for free and hundreds of websites that do so also. I have never turned down any request for someone to use my music for TH-cam videos. Asking allows you to use it legally and for me to place an exemption so you do not get flagged. All I and most composers ask for is the name of the composer as a credit. Music by_____. So easy!!!
Hopefully I cleared this up!!
Along with many other subscribers to this channel I hope your brother may get well and in perfect condition soon. It seems I have missed your former message about him, which is odd, since I follow your channel closely. Fortunately, we live in a time when medical science and technology has made an important progress with regard to the treatment of cancer. His chances have never been better. Keep up the good spirit and be strong.
Hello John, My thoughts and prayers are with your Brother, you and your family. I wish you all the best. Be strong for your Brother, Mom & Dad and You. Thank you for sharing your vast knowledge. No reply necessary as you have other priorities. See ya, C.
I am following your channel and many audio projects are very helpful like jat half baked project was very good amplifier runs on single supply.
I couldn't resist to build the internal circuit of the LM380 out of discrete transistors. And I found it was flawed in that the top output transistor needed an NPN before it connected as darlington, and an additional diode in the vbe multiplier.
After that, the amplifier worked wonderfully at 12V. More supply and it started to need biasing adjustment because the quiescent current ran up too much.
The external circuitry I used your configuration for the IC version.
All transistors I used were BC337-16, BC327-25 and the power outputs MJD44H11.
This is a great channel. I'm surprised this is the first time I've seen it.
A lot of the lower end broadcast mixing consoles used the LM380’s for headphone drivers! Noisy!
In the 1970's I built a 2x100W rack mount power amp (2n3055/2n2955 outputs) and added 2 x LM380s to drive a separate headphone output. This allowed the headphone volume to be separate from the main amp volume. For heatsinking, I used quite large copper plates as "wings" off both sides of the centre pins, and they would drive the 'phones at good volume if necessary.
Prayers for all of you!
Our thoughts are with your family in this difficult time John. Thanks for all the quality content.
Sure would likea run down on your stereo to mono box with the summing switch. I built my first LM380 circuit in 1979
I´ve recently discovered your Channel. It is awesome for the Newbies (and not so newbies also). I´ll be watching your Videos for a very long time. Cheers.
Tyvm for your time and knowledge my friend.
prayers for your brother...brother.
Just ordered some 380's - thanks!
Probably not your HiFi component, but from the looks of it, it should do the job just fine.
Nice little comparison between the LM380 and LM386.
I would like to see a PCB board designed.
Snickers seems completely unamused... My prayers go out to your brother and family.
How did you accomplish the foil area on the back side of the perf board? I don't remember getting a good look at it.
Much thanks James. I used two pieces of 14 gauge solid copper wire passing between the heat sink pins on the IC going across the board.
Nice video
If a resistor is connected between the input of an amplifier and ground, what's the actual function of it ?
Sometimes I see a resistor connected across the Input pin and ground after the potentiometer and input capacitor, sometimes after the potentiometer only. Some amplifier chips like lm386, tba820 circuits that have input capacitor connected before the potentiometer and a resistor connected across the Input pin and ground and so on..
2. Secondly, some circuit diagrams suggests a resistor be connected in series before the potentiometer acting as input impedance but some have the resistor connected across the Input pin and ground after the potentiometer. What's the difference between these ?
Sorry about your brother. Chin up.
You didn't mention the PG & SG Grounds.
I made this circuit and have made quite a few LM 386 circuits as well. I have found little to no difference in volume when using 12 volts or 22v in the case of the LM380. Even with the LM386 4 at 18 v not much more by way of volume than at 9 or 12. I am using a couple different power supplies. Both put out up to 5A. One up to 30v and the other up to 24Vv. Am I doing something wrong or is this typical ? Sometimes their seems to be more punch but not much more volume. I try with all different sized 4 and 8 ohm speakers. From 5" to 15". Mostly high end 8",12" and 15" speakers. Mostly using with guitar input which I am guessing impedance is a big factor. But even running music or Arduino musical instruments, such as synths and drum machines, as source input through the circuits ,not finding the expected volume increase with more voltage. If anyone has an explanation it would be greatly appreciated!!
My best wishes to your brother and you, sir
great video
That oscillation is almost certainly caused by powering the amplifier through long wires from your power supply. Put a capacitor across the supply at the circuit board end and it will disappear.
There is a ceramic and electrolytic supply bypass capacitor right at the chip pins. This is instability of the output CFP.
i LOVE YOUR CAT..bUT HE LAZY af :)
The cat (snickers) is the cutest part of the videos roaming here and there and all the background sounds like the telephone ringing makes the videos exciting all the time
Wish your brother figure out how to against the cancer soon and got recovery.
I have two questions -
1. The input coupling capacitor is connected at input pin but if I connect potentiometer at input will I have to connect the capacitor before the potentiometer or after it ?
2. The zobel network has the capacitor connected at the top and the resistor at bottom (ground) whereas in datasheet the resistor is connected at the top and capacitor at bottom. Will it make any difference ?
1. Place the pot in front of the cap.
2. Series circuit. No difference.
Anyone tried using two NE556 timer chips as Class D Audio Stereo amplifier with the output pins drivings a high power driver modules.
Ever Bench TDA8932BT???
I’m Trying To Find A Demo Around That Surface Mount
❤️🙏
god bless your brother
Hi, do you have any experience with the DIP8 package of these? I mistakenly got those instead of the dip14, so I was wondering if you could squeeze the same power out of them if you throw on some heatsinks.
Without the heatsink pins and the smaller package, you would be stressing the chip to put out higher power of the larger one.
Hi, do you think it would help with the oscillation if you were to make the input filter cut off between 20 and 30kHz?
I doubt that would help. It is an instability of the chip design, probably the output stage. Using a series coil on the output should remove it. It is really too small to be of concern.
Can you tell me what is the equivalent IC of LM380N??
9:48 Which is better for 16 Ohm loads?
Hello Snickers!
Can i please get the values for the components
God be with your brother and his family, we will pray for his recovery.
Great informative video, as always.
The best way to stop these copyright clowns is to stop buying their music.
Like Gibson guitars their lawyers have to prove they are worth their fee because they can no longer make money from their old tech guitars.
Reputedly Scum bag companies and musicians in their twilight years resort to litigation as their main course of income.
Only washed up musicians and actors resort to litigation for incidental or accidental portrayal of their work.
Your vids are ompulsive viewing
⭐⭐⭐⭐⭐
I discovered a lot of good music here on YT. In many cases, I went and bought the music for my collection. If they keep pestering people who post bits of music in their videos, it won't be discovered. Seems to me they shoot themselves in the foot.
@@JohnAudioTech So true Sir, so true.
5:10 OHHH, that is why the LM386 has always sounded like shit for me, I always grounded the unused input...
Can 386 drives a pair of final stage of power amp.
Would be a waste of time, the LM386 has maximum supply voltage of just 12v and internal feedback output voltage swing is very limited and you wont be able to apply much in the way of negative feedback to reduce non-linearity in your output stages.
@@ferrumignis what about tda2050🤔
I don't understand the complaints about the music issues. Is TH-cam running the scans to discover copyright violations, or the owners of the music ? I don't see how the owners would discover violations unless they sat down and listened to millions of hours of videos; and TH-cam simply wouldn't conduct such a scan because they have no interest for such a search. So, who's doing what and what's the objections. I agree that it seems like free advertising of their product . . . BUT it is their product and shouldn't they have the right to decide ? I'm truly curious . . . not trying to fight. Someone ?
Hi. What do you think about this circuit it this video th-cam.com/video/fSQkoWWiVL0/w-d-xo.html it is a small germanium amplifier.
I really like that 70s sound of germanium amplifier and i have these transistors. I am thinking of building stereo amplifier with that circuit.
Only thing that is not clear to me is why is there 4 pins on volume pot.
That circuit is taken from a vintage radio.
U build for people
Sir I am trying to make a transistor audio amplifier on equivalent schematics of audio amplifier
stk 4392
that runs on single supply voltage
Would be thankful if you guide me about this project I have some material I can share if you like
Hardly worth bothering to emulate a very common and low-end chip like STK 4392. The obvious solution is to:
1. Buy some STK 4392
2. Read STK 4392 datasheet to find application schematic
3. Wire your STK 4392 into a suitable circuit.
@@johncoops6897 thanks for giving reply.I know that it's a very commonly used ic 4392 I want to send you some of my tracing on my work about the circuit on what's app or Facebook messenger ? Please send me your number or Facebook I'd
@@hamid185100 - no, thanks. I have plenty of good amps here, so I have no need for 4392
Every single human on this planet would die for more of the devils paper/money, its disgusting.