How to Make a PCB Vu-Meter with LM3915
ฝัง
- เผยแพร่เมื่อ 1 ม.ค. 2019
- ■ JLCPCB Prototype for $2(Any Color): jlcpcb.com
This is a Vu-Meter with 10 LEDs, driven by one LM3915, the circuit has been professionally realized on a PCB (Printed Circuit Board) by the JLCPCB service. it is also possible to set a graphical view with Dot or Bar mode. In this video I will go to assemble this Vu-Meter step by step. Assembly begins at 3:05 in the video, at 6:02 I have decided to do an electrical test before connecting the circuit to an audio system, and at 6:28 you can see the Vu-Meter test with a song.
After trying the excellent service offered by JLCPCB I recommend it, the quality of the circuits is high, customer service is always available and professional, the time of realization is short and the delivery of PCBs is by express courier.
JLCPCB is a great place to get hight quality custom circuit boards at an extremely low price, you can buy 10 PCB Boards for 2 Dollars.
JLCPCB is the largest PCB prototype enterprise and a High-Tech manufacturer specializing in quick PCB prototype and small batch PCB production. With over 12 years of experience in PCB manufacturing, has more than 400,000 customers, with over 10,000 online orders of PCB a day. Customer service is one of the best in the world, so feel free to upload your Gerber files for file review before completely submitting your order.
■ Component List:
- 1X LM3915 IC
- 7X Green LEDs 5mm
- 1x Yellow LED 5mm
- 2x Red LEDs 5mm
- 1x Green LED 3mm
- 1x 1KΩ Resistor
- 2x 2,7KΩ Resistors
- 1x 100KΩ Resistor
- 1x 1N4007 Diode
- 2x Pin (For Dot/Bar)
- 3x Pin (For + - signal)
- 1x 1 uF@25V Electrolytic Capacitor
- 1x 100 uF@25V Electrolytic Capacitor
This circuit must be powered between 9V and 12V DC, below I leave the references to view: the diagram for the electrical connections, the electronic circuit, the PCB and the Gerber file to be uploaded directly on the JLCPCB website.
- Connection Diagram: 8:12
- PCB (Printed Circuit Board): 8:20
- Circuit Diagram: 8:25 (*Electrolytic Capacitor)
- Gerber Files (Ready for jlcpcb.com): goo.gl/rzkXbJ
*Don't use my PCB for profit or sponsored videos.
*You can see the complete procedure to upload the Gerber file on jlcpcb.com in the video from 1:18
**JLCPCB have a Technical Support for exporting Gerber files from many software at this link: support.jlcpcb.com/category/2...
For any other questions you can ask me for explanations in the video comments:)
■ 20 LED Model: • Vu-Meter 20 LEDs LM391...
► Subscribe to my Channel: / stefano91ste
WARNING: This video is only for demonstration. I don't take any responsibility for damage to things, people and animals.
Music:
- Iron Man Theme (During the presentation of JLCPCB)
- Devotion by Vexento (During the assembly)
- Soldiers by Vexento (During the musical test)
#JLCPCB #PCB #LM3915 - วิทยาศาสตร์และเทคโนโลยี
► Gerber Files for this Vu-Meter (Ready for jlcpcb.com): goo.gl/rzkXbJ
melega sir or ketna rupya parega
If you can share shematic i would be very appreciate , i have a project to do and shematics what i found is nothing like you
Hi, the circuit diagram can be seen in the video, towards the end.
sir, I love the fact that you share the files and build tested I'm gonna recommend your channel thank you so much :)
Thank you :)
Ora i video sono nettamente di qualità superiore da quando hai iniziato, continua cosi :D
Very nice clean circuit , thank you for sharing
Thank you!
thank you for sharing us this video
Sir, You are a great and super man. I don't speak english but I want to tell, your projects are super!
Thanks for appreciating my work on youtube!
Hi! As you suggested, I am making my first vu meter project with a simple one, and I found it convenient to try this yours. As far as to now, I have it almost ready, I made the electric tests (vcc power 12V), but I couln't make the vu meter work.
In relation with the electric tests, I connected the input signal to vcc+, and bar mode worked OK turning all the leds on. And when disconnected the input signal from the vcc+ leds began to turn off sequentially as expected.
But in dot mode results were slightly different from what you showed in your video. When I did the test and connected the 12V supply it turned on not only the highest vu meter led (the last), but the lowest green led too (but with less intensity). And when I disconnected the input signal from the vcc+ the last led (the highest in the vu meter) turned off and the lower immediate led turned on, and so on, going one by one on and off until the first (lowest in vu meter) finally turned off. So, I suspect it is OK in spite of turning on with less bright the highest led at the begining of the dot mode...
I tried to give the audio input signal to the vu meter in two ways (directly from the cell phone, but didn't work (as you explained to another user in the comments). And then tried to amplify the signal from the cell phone with PAM8403 module, but with no results :( No way with the vu meter. Just the electric test...
Finally, I payed much attention to the PCB design, and to the diagram you showed in the video, and I noticed a little difference: in the diagram it doesn't appear a connection between pin 2 of the LM3915 and the collector of the three resistors and the 1uF capacitor (this connection does appear on the PCB!). So, I decided to replicate carefully the logic of the PCB design in a bread board, but I am frustrated due to no results with the vu meter.
May be it the problem is with the input signal. What source can I use? Do you have a video or detail or suggestion in relation to this? Any idea about how I can move forward? I would appreciate!
Thanks in advance!!!
Hi Pablo,
I try to answer you step by step, quoting the parts of your comment:
"In relation with the electric tests, I connected the input signal to vcc+, and bar mode worked OK turning all the leds on. And when disconnected the input signal from the vcc+ leds began to turn off sequentially as expected."
► This means that the circuit is working properly.
"But in dot mode results were slightly different from what you showed in your video. When I did the test and connected the 12V supply it turned on not only the highest vu meter led (the last), but the lowest green led too (but with less intensity)"
► I also found this "Defect" but only with some LM3915 .. I still haven't managed to understand why.
"I tried to give the audio input signal to the vu meter in two ways (directly from the cell phone, but didn't work (as you explained to another user in the comments). And then tried to amplify the signal from the cell phone with PAM8403 module, but with no results :( No way with the vu meter. Just the electric test..."
► As an input signal for this vu-meter I use what comes from the amp's amplifier outputs (connecting it in parallel to the speakers).
► To use the phone signal you need to amplify the signal, I recommend using an LM386 as I did in these videos:
Video 1: th-cam.com/video/Ex3waFdQrHY/w-d-xo.html
Video 2: th-cam.com/video/KWLLHiExLc8/w-d-xo.html
"Finally, I payed much attention to the PCB design, and to the diagram you showed in the video, and I noticed a little difference: in the diagram it doesn't appear a connection between pin 2 of the LM3915 and the collector of the three resistors and the 1uF capacitor (this connection does appear on the PCB!). So, I decided to replicate carefully the logic of the PCB design in a bread board, but I am frustrated due to no results with the vu meter."
► Diagram and PCB are identical, those extra connections on the PCB that seem different to you, are only the connections to GND of the various components.. on the diagram there are no because they are defined by the ground symbol.
"May be it the problem is with the input signal. What source can I use? Do you have a video or detail or suggestion in relation to this? Any idea about how I can move forward? I would appreciate!"
► In my opinion there is no problem, you just have to connect this vu-meter to an amplified signal, be it a transistor module, with LM386, with TDAXXXX or the amplifier output..
Keep me informed!
Regards
Super bhai
Thank you sir..it work..
how do you get the vu led to be connected to the preamp output line ... if the speaker input line is less sensitive
Hello, it should be connected to a preamplifier, or to the amplifier outputs in parallel to one speaker
Thank.
:)
very nice
Thank you :)
Cool thumbs up
Thank you :)
Hi stefano, I woule like to add your design to a TEA2025B audio amplifier, do you think that the audio input have to remain like in your design? 2 pins (L+R) from TEA2025 to one input pin for LM34915?
Hi, if you use a Vu-meter for each channel yes, that's okay (at most add a 10K trimmer between vumeter and amplifier) otherwise the signals must be added if you want to use only one led bar.. in this video I used two 330 ohm resistors to add the two audio channels: th-cam.com/video/KWLLHiExLc8/w-d-xo.html
@@Stefano91ste Thanks for your answer. Problem solved, but I still have a question for you. the brightness of the leds is not the same when I test them connecting the audio in in with the Vc+ and when I connect the 3.5mm jack with the Ipod. Coud be that the power of the Ipod is not enough?
Привет! Спаял всё работает! Класс!+
suuper thank'u
I love JLC PCB
The quality is excellent, considering that I have taken the standard PCB :)
@@Stefano91ste I use JLC PCB in every prosjektet i do
I've just started xD, the PCB projects I brought in the past were made by me at home
A nice project, a good board and some expert soldering! Thank you Stefano. Can I order these particular boards? It is ages since I did any electronics and this would be an ideal project to get me back into the hobby again. Great stuff - well done!
Hi, thank you:)
You can order this board on jlcpcb, in the video description I put a link to download the project files.
Hi, i built this and it works great with my mobile output. but one problem i am having is when the audio rectifier (the part with the diode and capacitor) is added, the sensitivity gets very much reduced. i have tried decreasing ref-hi voltage of the ic but it gives weird results. without the rectifier, everything is fine. can i increase sensitivity of the rectifier by reducing the capacitance? is an electrolytic capacitor okay or a ceramic one is needed? please advise.
Hi, the capacitor must be electrolytic, but this vu meter must be connected to an amplifier not to a mobile!
@@Stefano91ste Hi. thanks for the reply. I am using a pam8403 class d amplifier so i cannot connect it to its outputs. however i solved the issue by simply reducing the capacitance to 0.5 uf. now works great.
Sir how much audion input signal we have to use? Means can i directly apply 30 or 40 watt speaker output signal into it pls reply 🙏
Do you have any schematics for a tachometer? One that doesnt use audrino but uses reed switch or hall effect sensor? One that uses a 7 segment display
I have only this: th-cam.com/video/Kowv-nJnX7o/w-d-xo.html
Hi,, nice job,, How did you get your led's to all test on at one time?
Hi, thank you!
you need to bring VCC directly to the signal input, with nothing else connected to the input
Bravo✨
Grazie :)
Very cool meter. Question, the negative of the signal doesn't get connected?
Hi, thank you! the negative has also connected, it is connected together with the power supply negative (common GND)
Hello sir very nice video
Thank you:)
Sir, please tell me ,which is the negative of the signal get connected
Hi, It must be connected in common with GND of the power supply
Beautiful work!
Would you have the PDF PCB file ready to print at home?
Hi, thank you Daniel! I only shared the Gerber file
@@Stefano91ste Thanks
I have made a circuit like this ... it can be hindup, but the led does not want to respond to the music tone ... if the audio source pin is touched using a finger then the led is on. what's wrong?
It could be a problem with the audio source, which amplifier do you use?
bello stefano
Grazie:)
Please make peak holder also
Nice 👍🇫🇷
Thank you :)
can the 2k7 ohm resistor be replaced with the 2k2 ohm resistor?
Yes with 2.2K
sir any explanations for the connections on the circuit?... badly needed it for my defense
Hi, look at 8:12 in this video.
amigo con que programa podemos ver los archivos que son gerber
Hola, uso gerbv pero puedes usar cualquier visor en línea de archivos gerber
Whoa 😮 Nice Projects 👍✨ Can I Replace LM3915 into LM3914? Thanks a lot ✨😊
Thank you! And yes you can
Jio boss
Where are you ? And how much ship fee of you to take your pcb ?
I don't ship the PCBs, I shared the gerber file so anyone can buy them on jlcpcb and other manufacturers
Pcb ka kya ret h
Can I use Ur project and produce the Vue Meter board ? Need ur permission to buy from the company same ?
Hi, sure you can use the gerber file that I shared to buy the boards, I can recommend you to use JLCPCB because I think it is among the best pcb producers. I shared the file in such a way that it can be useful to other electronics enthusiasts like me, the only things I do not allow are to use my pcbs for commercial purposes
Como Que Eu Compro A Placa Montada
- Hi, in video description you can download the PCB files to upload to JLCPCB, to buy the board.. but only the board.. then you have to assemble it.
- Hola, en la descripción del video, puede descargar los archivos PCB para cargarlos en JLCPCB, comprar el tablero... pero solo el tablero... luego debe ensamblarlo.
can i change 1uf capacitor to 2.2uf?
Yes, but the LED switch-off speed will be slow
What type of amplifier connected to middle terminal....
An amplifier like those of class A, B or C, stereo or a car-radio.. LM3915 basically receives analog voltage as input.
Can we directly add mic with this circuit.
Not directly, you should add a pre-amplification circuit between the microphone and the vu-meter. For example, you could use an LM386
I have made this circuit but only led number 4 is glowing/working tell me the solution...
How did you do it, with my PCB or other way?
Have you checked that all the components are OK?
If you do a test like you see in the video at 6:08 what happens?
Man, I need help. I want that LED's will always full active even when I volume down (min) the audio of the speaker.
Can u please help me? It would be very helpful!
Keep up your nice work.
Hi, thank you!
Try to change the 100K resistor with a 10K resistor.. let me know if it works.
👍🇮🇶
Thank you :)
Sir audio negative?
Hi, to speaker negative
Bhaiya muje 20 wala vu meter pc boord chaye
Can you send me PCB layout of this project
Read the video description, there is a link to download gerber files
Sir ऑडिओ नेगेटिव्ह कहा लगता हैं
That electrolytic capacitor is way too taller than the LEDs... and the PCB could be at least 30% smaller. But keep up the good work...
Right observations
Vu meter ka rs- ketna ha sir mujay mumbana ha plz bataya
Please write me in english
1kom at what watt ?
1/4 watt
perchè non fai il pcb a 20 led?
Perchè essendo il primo PCB che ordino online volevo partire da qualcosa di semplice, sia per non sbagliare che per prendere confidenza con il sito.
Poi non so se fare anche quello da 20 o direttamente quello da 40 a cui sto lavorando xD
WOW inizi il 2019 col botto, un vu-meter a 40 led
Hehe :)
I have a problem in giving input
Hi, what kind of problem do you have?
The input for these vu meters must be taken from an amplified source
Amar kechu bod lagbe kothay pabo?
English please
40 led Vu meter video banake dekho
I'm designing a 40-LED vu-meter, it takes some time!:)
Nahi ye to jlcpcb to nahi lagta hai
Usme to pakkage bahut hi acchhe tarha kiya jata hai
English please, I do not understand
App online par bhejdona
Saund lait mangana hoto ke mangana hai
English please
Can i get your mail ib?
Hi, you can ask me what you want in the video comments
Sir WhatsApp number
Sir 40 led Vu meter chahiye please
Hi, I'm working on a vu-meter with 40 LEDs, but it's not ready yet, I'll publish the project here on the channel and then PCB and gerber files
Pement phone pe kar dounga please please