Vu-Meter 40 LED on PCB with LM3915 TUTORIAL

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■ JLCPCB Prototype for $2(Any Color): jlcpcb.com
This is a Vu-Meter with 40 LEDs and four LM3915 on awesome Black PCB!
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■ Download Project Files:
PDF Diagram: bit.ly/2SkHyTE or see it at 10:08
PCB Layout: bit.ly/2XL9aXU or see it at 10:15
PCB Gerber: bit.ly/2Z1Uj84 (Ready for JLCPCB)
Like, Share and Subscribe :)
This Vu-Meter is composed of four LM3915 in cascade, for a total of 40 LEDs and a range of 90dB. The circuit must be powered with 9V DC and connected to the amplifier output (or preamplifier).
After trying the excellent service offered by JLCPCB I recommend it, the quality of the PCB is high, customer service is always available and professional, the time of realization is short and the delivery of PCBs is by express courier. JLCPCB is a great place to get hight quality custom circuit boards at an extremely low price, you can buy 5 PCB Boards (Any Color) for 2$ !!!
More About JLCPCB: support.jlcpcb.com/collection...
Components:
- 40x LEDs 5mm (33 Green, 3 Yellow, 4 Red)
- 1x LED 3mm (Any color, as you prefer)
- 4x LM3915 ICs
- 4x 18 Pin DIP
- 2x 1KΩ Resistor 1/4W
- 1x 100KΩ Resistor* 1/4W
- 8x 2.7KΩ Resistors 1/4W
- 1x 1uF @ 25-100V Electrolytic Capacitor
- 1x 220uF @ 25-100V Electrolytic Capacitor
- 1x 1N4007 Diode
- 1x Button (as TEST Button)
- PCB: (Ready for jlcpcb.com): bit.ly/2Z1Uj84
*Don't use my PCB for profit or sponsored videos.
*NB: If the first LEDs stay on without music replace this 100KΩ resistor with another 50KΩ or 10KΩ resistor.. may be necessary with some amp models.
You can see the complete procedure to upload the Gerber file on jlcpcb.com in the video from 1:20
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:)
► 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: Soldiers by Vexento - • Vexento - Soldiers
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■ LINK
- RU-vid: / stefano91ste
- Instagram: / stefano91ste
■ Do you want to Make a PCB?
Look this: • Vu-Meter Stereo -20 +3...
#VuMeter #Tutorial #PCB

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Опубликовано:

18 июл 2019

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Комментарии : 289

@tonyd1149 3 года назад

Just beautiful. Thank you so much for providing the method of submitting PCBs and to a recommended manufacturer for production. (You're a great teacher). Tante belle cose, Stefano. Ti ringrazio.

@Stefano91ste 3 года назад

Thank you! Grazie a te 😁😁😁

@andreabetti9018 4 года назад

certo una cosa fatta da soli è una soddisfazione, forza io ti aspetto! Sei un Grande!

@MahmudulHasan3044 5 лет назад

Looks so satisfying!! love it.

@Stefano91ste 5 лет назад

Thanks:)

@bharatyadav8931 5 лет назад

Very nice project. thanx for detailed discription...

@depup2404 2 года назад

Nice build. I just wanted to ask if it works with smaller amps(20 watts) because in my testing it does not work with amp(20watts), but works with a greater output of minimum 50w, maybe the reference voltage is too low or something else...

@juanjobravo4476 3 года назад

Excelent! but if you need accurancy reading of db, is possible to calibrate de signal maybe if use a trimmer ?

@juango47 Год назад

Amazing work, I´ll tray to make one!

@bradricketts6091 2 года назад

Can this VU meter be connected to line level signals and not the output of an amplifier? I want to add a VU meter to a Mixer board to monitor the output of a microphone before it is sent to the main output channel of the mixer board.

@RachmanLusana 4 года назад

Love the big text. I able to read. Thanks for Scheme n layout at end of frame

@Stefano91ste 4 года назад

Thank you for appreciating my work :)

@manoranjan8114 3 года назад

Sir ek pcb vu meter mujhe chaiye

@muthukumars3899 4 года назад

Good design, nice work I like it Can you have more than one line led three or four lines

@HarpreetSingh-yo9ir 5 лет назад

SIr can you please tell me how to adjust senstivity of these lm3914. where should i have to connect potentiometer to adjust the led senstivity?

@Stefano91ste 5 лет назад

you can add a potentiometer in series with the audio input

@RaptorAvril 5 лет назад

Could you please tell me where you got the pins from which you use on the power and input to connect the crocodile clips to. Been trying to find some exactly like that. Many thanks.

@Stefano91ste 5 лет назад

Hi, I bought them on this site: it.opitec.com/opitec-web/articleNumber/319032/zz/cID/c3I6YW5jb3JhZ2dpOQ==

@rms-repairmainanseremban8403 3 года назад

whats the name of that pin?

@nikhiljinwal8613 Год назад

Hi I bought a vu meter based on LM 3915 N-1 ic to add up in my subwoofer power amplifier however when connecting it to output of the amp subwoofer starts humming. Plz suggest how to connect vu meter with my homemade subwoofer power amplifier.

@badeakabha2457 5 лет назад

Very good project 👍

@Stefano91ste 5 лет назад

Thank you!

@vade7424 10 месяцев назад

Hello there, do you know how to add an adjustment for a specific frequency? Thanks!

@Stefano91ste 9 месяцев назад

Hi, a dedicated filter must be designed for each frequency

@mateoteoo805 2 года назад

Do you have a drawing made with the Proteus program?

@estrafalopio 3 года назад

Estefano, where can I bought the header pins in PCB (VCC - GND - Input)? Thank you.

@Stefano91ste 3 года назад

Hi, i buy it here: www.opitec.it/Macchine-utensili/Saldatore-da-stagno-accessori/Stagno/ancoraggi-p-circuiti-stampati-argentati-1mm-100-p.html?listtype=search&searchparam=saldatore&pgNr=1

@HarpreetSingh-yo9ir 4 года назад

Hello sir. I made rpm meter by the above configuration. And i have used lm3914 3ic's. I am getting problem . When i give dc supply to the ic, led turn on from starting to end. Without any signal voltage. My signal wire isnt connected to anything

@Stefano91ste 4 года назад

This is just a Vu-Meter, there is a whole circuit missing (LM2917) to be able to use it as a display for a tachometer

@moxysoft 4 года назад

Help! I ordered several and when assembled they all exhibit the same thing - the bottom LEDs about 5 are solid on.. changed to 100 ohm and 2 stay on. Can you assist me? ( Even when no sound source is attached )

@Stefano91ste 4 года назад

This is strange, with various tests I did on the vu meters, I found this problem in two cases: 1) the audio source has a signal with noise (But if replacing the resistor as I wrote in the description, everything works fine) 2) disturbances are present in the power supply. Have you tried to power the circuit with a 9V battery?

@barrywhitlock6680 4 года назад

This is great. I have a 1/14 scale box trailer and would like to put this type of lighting into it without a remote control or an electric power supply, Would this work on just a battery pack? and what sort would you advise as I am a complete novice,

@Stefano91ste 4 года назад

Hi, Yes it also works with battery.. you need a battery between 7V and 12V, for example two 18650 in series would be fine

@barrywhitlock6680 4 года назад

@@Stefano91steThank you so much that's great to know.

@barot67 Год назад

Buongiorno Stefano, scusa, ho da chiederti da inesperto cosa usi come input del segnale. Ho provato con max 4466 e un modulo con microfono ma non funzionano, nel senso che non gli arriva il segnale o e debole Ho provato il test e i led si accendono..il tutto fatto solo come uso personale per imparare grazie

@DevendraSingh-ni4sd 5 лет назад

Very nice

@bassmekanikproboosterz7791 5 лет назад

Very good! Hola soy d argentina buenos aires. Excelente el proyecto. Queria saber si este circuito aguanta para otros 40 leds en paralelo o serie como armar en estereo. Gracias seguidor de su canal. Me gustaria si se puede hacer con 10, 20, 30, 40, 50 leds power high d 1w y mas tambien. Gracias

@Stefano91ste 5 лет назад

Hola! Gracias :) - Si haces dos de estos tableros, puedes usarlo en modo estéreo. - para los LED de alto brillo (1W) se deben hacer algunas modificaciones al circuito porque los LM39XX no pueden emitir tanta corriente. - Ya he creado Vu-Mete con 10, 20 y 40 LED.. y haré otros con 30, 50 LED y tal vez incluso 80 y 100 LED. Lo siento por mi español :)

@pierch99 5 месяцев назад

très beau travail de pro.....

@spoiled_kitten 3 года назад

Hey there. So a bit of an ask but I was wondering if I could get the project files that u made the pcb with. I want to add an amp into it and have it share the same pcb but can’t seem to use gerber files for that. I am willing to pay a little. If so that would be insane! Take care. Blake

@Stefano91ste 3 года назад

Hello Blake, I only share the gerber files and the schematic, if you want, from the schematic, you can redraw your own PCB

@spoiled_kitten 3 года назад

@@Stefano91ste damn okay. Algd. Also have you thought of making like a 32 band analyser. I saw a video but don’t think it uses the same board as this but was so cool

@richeck328 Год назад

Very nice project, love this so much I placed an order with JLCPCB with your Gerber files for 20 boards then designed a case useing open scad for a duel and a single channel display. Wish I could upload photos and the stl files here. I got the case with 2 alternative front display panels and 2 alternative back panels with cutouts for all input components. I used a 50k ohm potentiometer to adjust the input levels in the final project. Guess ill have to post a video and files on my youtube channel and provide a link here.

@Stefano91ste Год назад

Hope to see it soon! thank you for appreciating my work :)

@gerardoaurilio3457 5 лет назад

bellissimo stefano ho già ordinato i PCB

@Stefano91ste 5 лет назад

Grazie mille e Grande!!! :D

@geoffbaillie8442 4 года назад

Hello Stefano, which resistor is the 100k, is it the one marked 10k? As I don't have any on the PCB marked 100k.

@Stefano91ste 4 года назад

Hi, is the one at the bottom right, on the PCB I have already marked as 10K

@geoffbaillie8442 4 года назад

Thanx M8.

@loicmentha4224 4 года назад

Hi stefano, How could I turn this into a dot meter ? Thanks in advance

@Stefano91ste 4 года назад

Hi, I explained to you in the other comment!

@janwaldmann5367 Год назад

Anmerkung zum Schaltplan: Der Dip-Schalter / Test-Schalter ist im Schaltplan nicht aufgeführt. Wie ist dieser verbunden?

@saldrow935 3 года назад

Excellent finished product. Any chance you sell bare boards for us to assemble? Thank you for your consideration. Keep up the fantastic videos!

@Stefano91ste 3 года назад

Hi, I can't directly sell PCBs, also for this I share the gerber files

@manalvartak8645 3 года назад

How are you giving the music input?

@Stefano91ste 3 года назад

Hi, from the amplifier output or from a pre-amplifier

@andreabetti9018 4 года назад

Buongiorno e Buona domenica Stefano, ti chiedevo hai mica un progetto simile a questo ma con funzione "dot"? Grazie.

@Stefano91ste 4 года назад

Ciao, buona Domenica anche a te! Con funzione DOT a 40 LED ho questo: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-SEHhDOUlOak.html (verso fine video ho inserito lo schema, non ne ho ancora fatta una versione definitiva su PCB. altrimenti come 40 LED su PCB ho solo questo. Poi ho Vu-Meter a 10 o 20 LED con DOT/Bar mode, tipo questi: - ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-KWLLHiExLc8.html - ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Ex3waFdQrHY.html - ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-STBpTjTC3XE.html - ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-7avb905F-MQ.html - ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-l8oUQpGAOCw.html

@enricocavaglieri 4 года назад

Ciao Stefano avrei bisogno di un tuo parere ..ovvero ho appena completato il progetto dei vu meter 40 Led e funziona perfettamente pero' mi chiedevo se c'era il modo di "rallentare" lo spegnimento dei led ? in breve rendere piu' fluida la progressione di accensione/spegnimento della barra.Ho confrontato il funzionamento con il video demo per controllare che non abbia fatto io degli errori di assemblaggio ma e' perfettamente identico. Ammesso che si possa hai qualche suggerimento da darmi ? GRAZIE CIAO

@Stefano91ste 4 года назад

Ciao Enrico, Per rendere lo spegnimento dei LED più fluido si potrebbe sostituire il condensatore elettrolitico da 1uf con uno da 2.2uF, mentre per l'accensione è un po più complicato, perchè gli LM3915 hanno un range massimo di 90dB da suddividere su 30 LED, ed avendo ingrandito il vu-meter purtroppo non si raggiunge il range dei 120 dB, ma rimane quello da 90dB spalmato su 40 LED. Una soluzione possibile sarebbe quella di far pilotare i 4 LM3915 da un microprocessore anziché collegarli direttamente alla fonte audio.

@enricocavaglieri 4 года назад

@@Stefano91ste Grazie Stefano !!!

@OGBOOTSY 4 года назад

I'm knew to pcb boards how do I order a board just like the one you used in the video...?

@Stefano91ste 4 года назад

Hi, You can Buy from jlcpcb.com 1) Download the project files (link in video description) or here: bit.ly/2Z1Uj84 2) Register on jlcpcb.com/ if you don't already have an account 3) Follow the procedure in this video starting from 1:33 NB: You can choose the color you want for the board.

@OGBOOTSY 4 года назад

@@Stefano91ste thank you soooooo much :)

@loicmentha4224 4 года назад

Sorry for that stupid question, just read the lm 3915 datasheet :) . So as the pin 9 is connected all the way to pin 3 on the pcb, the only solution to isolate the pin 9 and have a dot mode on that pcb is to unfold the pin 9, and instead of soldering it on the pcb, to connect it to a switch, right?

@Stefano91ste 4 года назад

Hi, what you say would work only with an LM3915, for the DOT mode of more LM3915 in cascade the situation becomes more complex. This is because when you have more LM3915 in cascade activating the DOT mode the last LED of each LM3915 stays on and you have to find a way to turn it off. In the past I made a vu meter with 20 LEDs and the working DOT mode, this is the video ( ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-KWLLHiExLc8.html ) in the diagram we see the solution I adopted, but I never applied it on big vu-meters for now. The solution is the two resistances: 1K near PIN 11 of the first LM3915 and 330 ohm near PIN 1 of the second LM3915 - NB, Drawing that diagram I made a small mistake: the 1K resistor on LED 9 must be connected to the cathode (not anode)

@loicmentha4224 4 года назад

@@Stefano91ste OK thanks a lot for all these informations :) . But I can see on this diagram u used one 120ohm resistor per led, is it absolutely necessary ?

@Stefano91ste 4 года назад

Hi, they are not mandatory, the LM3915 have an internal resistance.. I put them to further limit the power consumption.

@fotonills6930 Год назад

QUAL LINK DE VENDAS NA SHOPEE?

@malthusgalvao3825 4 года назад

Muito bom. Obrigado. Very good. Thanks.

@Stefano91ste 4 года назад

Hola:) Thanks for appreciating my work

@uemersonmoreira5082 3 года назад

não consegui pedir este circuito pela jlcpcd.com tem algo no endereço que precisa ser colocado, entrei em contato nao souberam explicar. tipo codigo de contrinuição so faltou isto

@Stefano91ste 3 года назад

Hi, I don't understand what the problem is. Just upload the .rar file that I shared in video description to JLCPCB.

@barot67 Год назад

Salve, posso chiederti che tipo di pulsante usi? e possibile non usarlo e fare un ponticello?..grazie e saluti

@Stefano91ste Год назад

Salve, certo è un semplice pulsantino che non mantiene lo stato di ON, puoi tranquillamente saldarci due pin con ponticello

@loicmentha4224 4 года назад

Thanks a lot for sharing this project ! I built this one and the other one with 20 led's, but I have the same problem on both. The 5 first LED's stay lit even if nothing is connected to the input. I tried to change the 10k/100k resistor with different values, but according to the value there's still 2 or 4 or 6 or 7 LED's who stay lit. Any solution ? thanks in advance !

@Stefano91ste 4 года назад

Hello, thank you very much! I found this problem only by powering the vu meter with a low quality (or not well filtered) power supply.. for example by powering it on battery or with my power supply everything works well.

@loicmentha4224 4 года назад

@@Stefano91ste thanks for your quick answer ! I use 9v battery, but I still have this problem.. I tried to change the value of the 10k/100k resistor but there's still some LED's lit. Is it possible that the problem comes from a bad connection or welding ?

@loicmentha4224 4 года назад

@@Stefano91ste I used 50V capacitors as I didn't have 10/16/25V, could it be the issue ?

@Stefano91ste 4 года назад

No, it is not for that, it is that having such a high range of LEDs the Vu-Meter is very sensitive, and therefore it can happen that it displays some disturbance.. the thing I do not understand is why this problem occurs only to some and not to all.. But I will find a solution!

@loicmentha4224 4 года назад

@@Stefano91ste Gonna build another 40LED's vu meter this afternoon as I ordered 5, I'll let u know if I have the same problem!

@andreabetti9018 3 года назад

ciao Stefano, ti dico una cosa che potrebbe interessarti, se ti mando uno schema, puoi trasformarlo in file gerber, ? ho anche il circuito, eventualmente te lo spedisco, si tratta appunto di un vu meter a 20 led con funzione dot/bar, cosi poi ce li facciamo stampare questo circuito, cosa ne pensi?

@Stefano91ste 3 года назад

Ciao, non posso disegnarlo io, ne ho già in programma uno con quelle caratteristiche.. ma se hai bisogno qualche consiglio per programmi di disegno PCB puoi chiedermi

@mekateknik3717 4 года назад

hi, the schema to 0:30 is ok for 40 led ?

@Stefano91ste 4 года назад

Hi, Yes.. it is the scheme of this project

@andreabetti9018 4 года назад

Stefano, io avrei trovato dove si compra il filtro a 31 bande, costa comprese le spedizioni 75$, avrei intenzione di prenderlo, ma se lo costruisci te, sarebbe meglio.

@Stefano91ste 4 года назад

Lo so, il problema è che ad ora devo progettarlo da zero e ci vuole tempo😅 Poi comunque usare un modulo già pronto non era nei miei piani

@moxysoft 4 года назад

Can you give a source for the test button? Thank you

@Stefano91ste 4 года назад

Hi, The test button is directly connected to VCC

@barot67 Год назад

Buongiorno Stefano, scusa ti chiedo di nuovo, da inesperto cosa usi come input del segnale. Ho provato con max 4466 e un modulo con microfono ma non funzionano, nel senso che non gli arriva il segnale o e debole. Ho provato con TRRS è non va...c'è da amplificare il segnale? va bene il LM386? Ho provato il test e i led si accendono..il tutto fatto solo come uso personale per imparare grazie

@Stefano91ste Год назад

Buongiorno a te Francesco, io uso segnale amplificato, quindi proveniente dalle uscite dell’amplificatore. In altri vu meter ho integrato un pre-amplificatore con LM386 (in questo video lo schema: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-imeEG9M_QDo.html ) spero possa esserti d’aiuto. PS: ho avuto tempo solo oggi di leggere gli ultimi commenti :)

@barot67 Год назад

@@Stefano91ste grazie mille

@jordonqian8669 4 года назад

Hello! Why is there only one hole in your lm3915 40 LED download DRL drilling file?

@Stefano91ste 4 года назад

Hi, the Drilling.drl file is ok, I just checked it now.. what's the problem?

@Stefano91ste 4 года назад

Load them on jlcpcb and use the gerber viewer, you'll see that everything is ok

@leddanushka1828 2 года назад

Can we make tihs as wireless

@edgardaraujorj 4 года назад

Hi... how to adjust the sensitivity???

@Stefano91ste 4 года назад

Hi, this vu-meter is not adjustable. If necessary you can add a resistor (or a timmer) on the + of the input signal

@hecirlenevieira6622 5 лет назад

Top de mais 😍😍😍😍

@greensocket3583 5 лет назад

love it:)

@Stefano91ste 5 лет назад

Thank you :)

@johnbravo7542 4 года назад

Electronics Projects-Stefano91ste do you sell the boards by any chance?,just the boards

@Stefano91ste 4 года назад

Hi, You can download gerber files in video description and order the boards on JLCPCB

@johnbravo7542 4 года назад

@@Stefano91ste Thank you

@EdEditz 5 лет назад

Can you also use the LM3914 for this?

@Stefano91ste 5 лет назад

Yes, you can use LM3914, LM3915 and LM3916 .. however the measurement range will change

@EdEditz 5 лет назад

@@Stefano91ste Ah okay. Thank you!

@Sgt_Hest 5 лет назад

You should make one that separates frequencies

@Stefano91ste 5 лет назад

is a vu-meter, no need to separate frequencies

@rightstufff 4 года назад

what is the input voltage range?

@Stefano91ste 4 года назад

Hi, is 8 to 15V DC (9-12V recommended)

@andreabetti9018 4 года назад

si, grazie, x il cell. si ho contattato il tipo sull'email ma costa 75$ finito, volevo vedere se si riusciva ad avere solo il circuito

@andreabetti9018 4 года назад

Ciao Stefano, vorrei ordinare questi circuiti ma non riesco, mi potresti aiutare? GRAZIE.

@Stefano91ste 4 года назад

Ciao Andrea, è molto semplice ordinare questi PCB: 1) scarica i file del pcb, di questo video, da questo link: bit.ly/2Z1Uj84 (lo trovi anche in descrizione video). 2) dovresti registrarti su jlcpcb.com una volta creato il tuo account devi fare l'ordine dei PCB. 3) Per fare l'ordine vai su jlcpcb.com poi premi sul pulsante azzurro "QUOTE NOW" e poi sul pulsante blu "Add your gerber now" e carica il file che ti ho fatto scaricare prima. 4) Scegli colore del pcb che preferisci e completa l'ordine. Puoi seguire tutta la procedura per ordinare i PCB nel video da 1:20 Spero di averti aiutato!

@uemersonmoreira5082 3 года назад

otimo v.u ele funciona com 12 volts ?

@Stefano91ste 3 года назад

Thanks!! Yes, 12 volts is Ok

@bassmekanikproboosterz7791 5 лет назад

Se puede hacer en modo PUNTO este vumetro?

@Stefano91ste 5 лет назад

Necesitamos hacer algunos cambios, pero todavía no he logrado que funcione bien in modo punto.

@lucanissoli9901 4 года назад

Ciao Stefano, ottimo lavoro. Ma come funziona col circuito stampato, lo devi fare tu e poi mandarlo a stampare? Cacchio che bello ma complicato per me visto che di pc non me ne intendo. Mi potresti aiutare? Te ne sarei riconoscente. Luca. Like meritato e iscritto

@Stefano91ste 4 года назад

Ciao Luca, grazie mille!:) Il circuito stampato l’ho disegnato io, è un PCB a due strati (layer) - in descrizione video trovi il link per scaricare i file gerber del pcb, così puoi farlo realizzare da qualsiasi produttore di PCB, io ovviamente ti posso consigliare JLCPCB :) - scegli il colore che vuoi tu per la board, e puoi modificare a tuo piacimento parametri come spessore del pcb e rifiniture. I componenti invece li prendi tu dove preferisci tipo negozi, fiere (quando riprenderanno) oppure online.

@Kostanj42 5 лет назад

amaizing!

@Stefano91ste 5 лет назад

Thanks:)

@vishakhramachandran7223 5 лет назад

How much ampere in this circuit...? Pls replay

@Stefano91ste 5 лет назад

Maximum 0.80A

@pramodrajrajappan9887 4 года назад

can you make a peak hold vu meter.....???

@Stefano91ste 4 года назад

is among the things I would like to do in the future:)

@mesiakbarov5023 4 года назад

Hi I made this board and want to use it in the car؟؟؟

@Stefano91ste 4 года назад

Hi, You can, but power it at 9 or 12V dc

@thesillyhatday 4 года назад

This wiring method only works for the LM3914 as it is a linear. The LM3915 has a logarithmic scale. The resistance value between the comparitors, are not equal. Watch carefully and you can see each bank of 10 LEDs is quicker to change at the bottom than towards the top. That and a VU meter slows down as it reaches the peak. Due to the logarithmic scale. Yes it works and looks good, but it is not an accurate VU meter.

@tizok77 3 года назад

Where can I buy the kit.?

@Stefano91ste 3 года назад

Hi, it's not a KIT but a PCB designed by me. In the video description I put the files for the PCB, you can order the boards on sites like jlcpcb

@Stefano91ste 5 лет назад

Thank you all for 25.000 Subscribers, a quarter of the way to 100.000 Subscribers!!!

@TrungNguyen-mn7kq 4 года назад

Tôi muốn mua phải làm sao ạ

@Stefano91ste 4 года назад

@electricalengineering6159 3 года назад

Pcb ap se may kayse launga

@spoiled_kitten 3 года назад

@mancavemusician 3 года назад

@@spoiled_kitten they are in the youtube description held on google drive

@DevendraSingh-ni4sd 5 лет назад

Suparb bro exelent

@Stefano91ste 5 лет назад

Thanks;)

@thayongnoi2661 3 года назад

give me the link to download the printed circuit

@Stefano91ste 3 года назад

Hi, you can find it in the description of this video

@joemay20 4 года назад

WHERE THE KIT AVAILABLE? how much is the cost?

@Stefano91ste 4 года назад

Hi, it's not a KIT but my DIY project.. in the video description you can find the gerber files of the PCB, and you can buy the boards on JLCPCB

@enzocicatelli6691 5 месяцев назад

Ciao stefano. Un lavoro bellissimo grazie. Volevo chiedere, si possono usare qualsiasi colore x i led? Oppure bisogna rispettare i colori indicati x via delle tensioni? Grazie di cuore x questa opportunità che mi hai regalato ❤❤

@Stefano91ste 5 месяцев назад

Ciao, grazie mille😊 Se usi LED normali puoi usare quelli del colore che preferisci.

@enzocicatelli6691 5 месяцев назад

Grazie Stefano. ❤

@andreabetti9018 4 года назад

ho capito, senti, ma x contattarti direttamente come faccio? Ti devo chiedere alcune cose riguardo ai circuiti.

@Stefano91ste 4 года назад

Ciao, puoi chiedermi tutto quello che vuoi nei commenti sotto i video

@parthtank7605 5 лет назад

Sir please test all vumeters you have made in older videos in one together

@Stefano91ste 5 лет назад

I add it to the to-do list :)

@aniyankuttanyga5417 4 года назад

Please send to me a 40led VU mtr PC Band full components

@Stefano91ste 4 года назад

Hi, you can find diagram, pcb and components in the video and in description.

@wiznumurti3397 5 лет назад

Does it work with 5V input?

@Stefano91ste 5 лет назад

Yes, you can power it with 5V but the LEDs light up little

@CHANDANKUMAR-em4rh 5 лет назад

Sir for 50 led to work of 5 ic At this diegram ?

@Stefano91ste 5 лет назад

It can work, just add an LM3915

@CHANDANKUMAR-em4rh 5 лет назад

Thanks so mutch

@Synthematix Год назад

The lm3915 produces a part log output which is no good for line level audio, you need to use the lm3916 for a log scale

@thrideesanratheeshkumar7128 2 года назад

How to purchase in this items?

@Stefano91ste 2 года назад

Hi, You can buy the PCB board on JLCPCB by uploading my gerber files (link in video description)

@radheshyammandal4132 4 года назад

Kahan milega

@ricardoricric2436 5 лет назад

A onde que muda ponto e Barra

@Stefano91ste 5 лет назад

- At the moment I still haven't managed to make it work well. - Por el momento todavía no he logrado que funcione bien.

@aleksandrzairullin840 3 года назад

Need this vu )

@Stefano91ste 3 года назад

PCB files are in video description :)

@hemantwarhade848 3 года назад

Can we use 4 x LM3916, instead of 4 x LM3915 ? Can I purchase the PCB from you ? If 'yes' then price ? and How to pay ? Thanking you Sir for your nice illustration !

@Stefano91ste 3 года назад

Hi, no, from the datasheet the LM3916s can be connected in cascade with a maximum of 3 pieces. I don't sell PCBs, but in the video description you can find the gerber file with which to order PCBs on JLCPCB ;)

@andreabetti9018 4 года назад

altra cosa Stefano, ma questo vu meter non ha la funzione (DOT)?

@Stefano91ste 4 года назад

No, su questo non l’ho messa perchè mi dava un problema sul quarto LM3915

@acf2802 4 года назад

LM3915 is 3dB per output. So, with 40 LEDs that would be 120dB, which is unrealistic, and it certainly doesn't seem to be responding in that range. What's the actual range?

@Stefano91ste 4 года назад

Hi, as I wrote in the video description: "This Vu-Meter is composed of four LM3915 in cascade, for a total of 40 LEDs and a range of 90dB" (The maximum range that can be obtained by connecting the LM3915 in cascade)

@Jay.ar30 3 года назад

@@Stefano91ste PCB size sir

@PalmiAudioLab Год назад

OTTIMO LAVORO BELLO.... DIAGRAM MANCA COLLEGAMENTO BUTTON TEST PUOI FARE VEDERE GRAZIE

@spoiled_kitten 3 года назад

What led type do you need? Or will any work?

@Stefano91ste 3 года назад

Hi, all types of standard 3/5 mm LEDs are ok

@spoiled_kitten 3 года назад

Awesome! Thank you so much for the reply!

@spoiled_kitten 3 года назад

Do you have a patreon or some way I cans support you?

@Stefano91ste 3 года назад

Thank you for appreciating my work on RU-vid! I have nothing like that, apart the merchandising on my channel and some banggood affiliate links. My channel is, and always will be, Free! To support me leave a like, a comment and share my videos :)