New audio spectrum analyzer

[v8power101]

He ripped this video off from some one else that is why he cant share the design docs....

[Alu10000]

@v8power101 Just prove it.

I do not accept provocations. I have already said that's a my project and the documentation is incomplete, because i never finished to draw the schematics.

So, just shut up.

[bosaap10]

The audio in the video is not so good neither is the quality but nice thing you made there

[Renegade30]

Very cool, huge circuit? Is that really necessary? Can't you just program a pic or something?

[hacktheplanet90]

No Prints or BOM LAME-O

someone take his soldering license away

[emil057]

ale syf tam na dole



[Tda7000]

Why no schematic? You should make this open source, as db35m says it has a lot of potential..

[JohnMalcolm]

or get the iphone app

[flapjackdj]

@JohnMalcolm it costs €30. great for monitoring to find the feedback freq!

[loolollol]

pogo hell yeah

[db35m]

what a shame your not willing to share schematics ..has lot of potential for taking this farther>>>>>

[2007excalibur2007]

Pogo ftw.

[roofy2k]

this is all analog?

[tiestomen]

so fucking oweso!! o_o!!

[pascalo1994]

can you send me an script how do do it?? pascalo94@web.de

[Alu10000]

@pascalo1994 Read the description above.....

[moscoesp1]

damn!

[mikelunatiko]

bandpass filters and vumeters for each band. simple but a little bit expensive (too much components).

do you have this video in greater quality?

[Alu10000]

@mikelunatiko no

[horlacsd]

@mikelunatiko

i think its DSP w/ the arduino, no analogue filters...

[Alu10000]

@horlacsd You're joking XD

[brunothiesen]

Please... could you send me the documentation of the analyzer? hehehe...

[djmudslide]

i absolutly love this song... and i like your work, im trying this on my logic desing classes.. good work!

[veterano3mb]

cordiale

[cuzspeed]

why you do not share information with people who want to learn a bit of Electronica.? I believe that sharing is a great gift that human beings we have at the same time we become better people

[Alu10000]

@cuzspeed I'm writing a tutorial to make this instrument, but in italian language.

[cuzspeed]

@Alu10000

Nice.. that is a good decision. Thanks for share. please leave your tutorial to see what happen

[Alu10000]

@cuzspeed I'm still writing it.

[mk3a2]

@Alu10000 When is it due? Dove lo pubblichi poi?

[EmpireLS56KW]

@cuzspeed No wonder he doesn't want to share with the other children.

RTA EQ some are inexpensive today for off the shelf models plus the display is too fast for my liking.

I have several EQ with RTA and TrueRTA which is too fast too jittery and I don't use it toEQ my room I use a Technics SH-8055 as an RTA

[SpecklePattern]

xD lol to your proto board. :) Few wires. And I totally agree. I love building things in electronics just for fun. Everybody always says something like "you know this can be bought as a ready IC?" Yes well its just more fun to do it yourself ;)

[RoteKampfSocke]

Could you build a similar Unit using individual LM3916's to drive the led-chain for each frequency band, and use active bandpass-filters to split the incoming signal into the individual frequency bands to drive the lm3916's with ?

What was your basic idea behind this design ?

thanks for your answer =)

[TheKoups]

yes you can. and from wat i can see thats similar to wats done here. can't tell for sure its really blurry. but so many bands its kind of over kill.

[cypher0147]

did u use integratet circuits or only transistor ...

bc your bord is so fucin big O-O

[Alu10000]

IC's and transistors....

[classicnz]

These are not that hard to make if you know how and are handy with designing analog audio circuits. you need VU/bargraph driver IC's and carefully designed bandpass filters on each. A lot of work but do-able. I have an old homebuilt one kicking around somewhere and it's far too complex though it looked cool when setup.

[Alu10000]

You forget one thing: the real and pure passion for the electronics.

If you do not have that passion you can not build these things, even if you like and would like to build them.

To do these things is also necessary to study, study and study again.

[reecieboii]

windows media player come with the same thing :P haha effort much but clever

[LehdaRi]

Wow that's awesome. The electronics need too much room I think. You're gonna have a hard time fitting that into something like.. computer case?

[sonicxlc123]

dude sooo cool were an i gt one

[Alu10000]

Please type correctly

[goompapa]

this is fake!! You just had a whole load of friends individually switching on single leds in time to the music. (kidding)

[lillyyoshi123456]

@goompapa yourea fukin stopid it si nat fack! how its fack?

[stdavross666]

NICE!

[tremer88]

looks like its straight from the delorean

[alienevil94]

grandissimo,che bel analizzatore

[cunijoeme]

you sure are dedicated 5* keep up the good work

[flick2040]

thats a lot of breadboard!

[bejius]

Massive circuitery !

[djball232]

yh sorry, yh so covers almost covers all audible frequencies except the top end, but still good (Y)

[djball232]

ahh so is the EM spectrum in the right order?

and wat frequencies does it cover?

:d good job tho its impressive

[Alu10000]

It is not a EM spectrum but an audio spectrum (the title said it). The band is 20Hz-20KHz, but the analyzer's band is 31.5Hz-16KHz.

[gavincurtis]

Twenty years old and making these wonderful things. You should have a great future with these skills.

[Alu10000]

Thanks!

[guruflorida]

I can understand that. Would it be possible to change one of your tone filters into a sweeping frequency and then sequence the LED arrays to the sweeping tone filter? So as to reduce the number of parts but stay in the analog domain. I'm guessing the sweep would have to be too fast to be update the display fast enough.

Just throwing out ideas.

[Alu10000]

Yes, you're right. Your filter is a "Voltage Controlled Filter" (VCF). But it's a little bit more complicated.

[gavincurtis]

you also lose real time response. But who is watching? >:)

[gavincurtis]

Indeed it is possible, but resolution is lost and display doesn't look right.

[Alu10000]

You're right. Infact i prefer band-pass filters ;-)

[guruflorida]

You could really simplify part count in the digital domain. You could use a CPLD or a small uC to time multiplex sequence the LEDs, so you would have an output for each row and column instead of outputs for all LEDs. You would need a processor to do an Fast Fourier Transform on the input signal though, and use a moving average filter on the FFT output bins to get a smoother spectrum like WinAmp does.

[Alu10000]

Yes, i know. But i prefer the analog way.

[mdmde]

looks kind of like the one I built in 1989 that had 27 h X 20 vertical=540 LED's but 3 colors were seperated by octave, not amplitude

[DJMasteroM]

Wonderfull Thing!!!!

Please can you me send the chematics, i will made an vu-meter whit the LM3915, but i don´t find chematics for the filters! Your build is the best what i find, but i don`t now how to make!?

Thx

THX and best regards

[Alu10000]

Ehm..no, i can't. Sorry

[Freccia7490]

straordinario ! una domanda usi un LM3915 per ogni barra di led?

[Alu10000]

No. Sono 4. Ogni LM pilota 8 barre, tranne l'ultimo che ne pilota solo 4.

[twilight1138]

Took me a while to realize the front of the display is entirely covered in parts :)

The leds seem to turn off a bit too fast, adding a fading effect (diode + low pass filter) on the band pass filters outputs might be nice.

[Alu10000]

Not the low-pass filter, but a simple parallel RC circuit after the diode, and R is adjustable (it's a trimmer), but the same RC costant is the same for eight bars (there are four RC costants, three for 3x8 bars and the last for the last four bars).

[gavincurtis]

Did you try the multiple feedback filter concept? You can get 4 bandpass channels from the LM324 with a Q of up to 10. But you will need high speed op amps once you are above 10Khz.

[Alu10000]

No...these filters are build around two op-amps for each band, with a Q=15.53.

[Alu10000]

Ops! A series RC circuit, not parallel.

[gavincurtis]

Crazy electronics person! XD

Very nice! :)