Search found 35 matches

by nobody
Sat May 09, 2020 7:52 pm
Forum: Modular Synth General Discussion
Topic: reverse engineer this sound picture
Replies: 14
Views: 448

Re: reverse engineer this sound picture

The file name gives a clue-- "Spectrogram-of-swept-triangular-wave.png". I can get something like it... Sweeps.png Of course exactly what it looks like depends on the features and settings of your spectroscope. This one was done in Max using a phasor~ which fills the image with aliases. What softwa...
by nobody
Sat May 09, 2020 2:10 pm
Forum: Music Tech DIY
Topic: Sequencer Build Recommendations
Replies: 9
Views: 366

Re: Sequencer Build Recommendations

voice of saturn, baby10, vanishing point. all the same. you have the CD4017 so just build it. I use CD4022. same thing almost. Yes sir! Probably will make this one for a quick one day build you could either build an R2R Dac and set each step voltage in software (not the best) or if you want analog ...
by nobody
Fri May 08, 2020 8:34 pm
Forum: Music Tech DIY
Topic: Sequencer Build Recommendations
Replies: 9
Views: 366

Re: Sequencer Build Recommendations

I have a bunch of 4017's and some op amps sitting in a drawer. I was thinking about building a sequencer. Go for it! Ive seen the Baby 8's and such from hackaday. Is that the circuit everyone is using, or is there something better? No not everyone is using the Baby-8, I use the XOR NerdSeq for inst...
by nobody
Thu May 07, 2020 8:41 am
Forum: Music Tech DIY
Topic: Pre Made Enclosures
Replies: 13
Views: 428

Re: Pre Made Enclosures

I was looking at something for work just recently....this one looks kind of fun

https://www.hawkusa.com/manufacturers/h ... gKfA_D_BwE
by nobody
Wed May 06, 2020 6:20 pm
Forum: Music Tech DIY
Topic: Sequencer Build Recommendations
Replies: 9
Views: 366

Sequencer Build Recommendations

I have a bunch of 4017's and some op amps sitting in a drawer. I was thinking about building a sequencer. Ive seen the Baby 8's and such from hackaday. Is that the circuit everyone is using, or is there something better? Or even an already made PCB that I can populate?
by nobody
Wed May 06, 2020 6:11 pm
Forum: Music Tech DIY
Topic: Pre Made Enclosures
Replies: 13
Views: 428

Re: Pre Made Enclosures

oblongcat wrote:
Wed May 06, 2020 3:47 pm
need something to stick it in.
:miley:
by nobody
Mon May 04, 2020 10:09 am
Forum: Music Tech DIY
Topic: Sine wave circuit issues on CEM3340
Replies: 17
Views: 321

Re: Sine wave circuit issues on CEM3340

Glad you got fixed. I am sorry I was unable to help myself. I am not able to access my builds and documentation right now. No worries! Should have them tuned up and ready to go soon. So I ordered new caps, and I finally figured out the problem. The manufacturer has them labeled weird on their websi...
by nobody
Fri May 01, 2020 5:38 pm
Forum: Eurorack Modules
Topic: existential crisis in eurorack
Replies: 117
Views: 4926

Re: existential crisis in eurorack

rayultine wrote:
Fri May 01, 2020 8:31 am
My neighbor's 12-year old kid sold his Pogs and his Razor Scooter to get a few modules. Ugh.
Did he get anything good? Beat him up and steal them.
by nobody
Thu Apr 30, 2020 8:40 pm
Forum: Music Tech DIY
Topic: Sine wave circuit issues on CEM3340
Replies: 17
Views: 321

Re: Sine wave circuit issues on CEM3340

Studioalethea wrote:
Thu Apr 30, 2020 1:54 pm
so the cutoff frequency was 154 Hz instead of 154kHz.
:doh:
by nobody
Thu Apr 30, 2020 12:01 pm
Forum: Music Tech DIY
Topic: Sine wave circuit issues on CEM3340
Replies: 17
Views: 321

Re: Sine wave circuit issues on CEM3340

Maybe I'm missing something, but this schematic calls for are a CA3080 and you are using a LM13700? Those are not gonna behave the same. I posted the 80-2 schematic, I am working on a clone of that. https://www.muffwiggler.com/forum/viewtopic.php?f=17&t=196940&start=75 Just take them out for now an...
by nobody
Thu Apr 30, 2020 11:15 am
Forum: Music Tech DIY
Topic: Sine wave circuit issues on CEM3340
Replies: 17
Views: 321

Re: Sine wave circuit issues on CEM3340

nigel wrote:
Thu Apr 30, 2020 1:04 am
Check C11 (and C12), if they are larger than they should be, that would roll off the higher frequencies.
My 22pf caps are 22nF. Arghhhh. Thanks. Thatll probably change some things. Now to find them in quarantine. Thanks!

:miley:
by nobody
Wed Apr 29, 2020 10:56 pm
Forum: Music Tech DIY
Topic: Sine wave circuit issues on CEM3340
Replies: 17
Views: 321

Sine wave circuit issues on CEM3340

Im working on a digisound 80-2 clone (the Octoginta II) and having some issues with the sine wave circuit. As the frequency goes up, the voltage drops really low. The voltages are ok out of the CEM chip and the op-amp that makes the triangle wave (IC2A/B in the attached photo LM1458), but something ...
by nobody
Fri Apr 24, 2020 10:00 pm
Forum: Music Tech DIY
Topic: [ORDER] OCTOGINTA-II Digisound 80-2 eurorack version
Replies: 96
Views: 8668

Re: [ORDER] OCTOGINTA-II Digisound 80-2 eurorack version

I am working on tuning. Any tips here? I am following the digisound docs but its not the best. Is there better instructions floating around? A couple of issues: I cant seem to get the sine output to look like a sine without the min voltage being above 0. It seems that amplitude goes down as the freq...
by nobody
Fri Apr 24, 2020 5:05 pm
Forum: Music Tech DIY
Topic: Weird 3340 VCO Tuning Issue :0
Replies: 29
Views: 488

Re: Weird 3340 VCO Tuning Issue :0

Not to hijack your thread but I am having trouble with mine as well. I have 25 Octoginta IIs (Digisound 80-2 clones) I am trying to tune and also have issues. How close did you get your sine wave to an actual sine? I can get it kind of close but not really. And as the frequency goes up the mean volt...
by nobody
Fri Mar 27, 2020 3:50 pm
Forum: Music Tech DIY
Topic: Front panel nuts for input jacks
Replies: 14
Views: 320

Re: Front panel nuts for input jacks

spacecadet wrote:
Wed Mar 25, 2020 8:27 pm
https://www.jameco.com/z/P3315-M6-Hex-N ... 27997.html

They look better in the flesh than the picture on their site. Unfortunately a bit overpriced.
Oh snap. Good ol Jameco

Yeah, I need qty 350 so it would cost me $90 + shipping. Farts.
by nobody
Fri Mar 27, 2020 3:47 pm
Forum: Music Tech DIY
Topic: PCBs as Front Panels ?
Replies: 179
Views: 14726

Re: PCBs as Front Panels ?

Make sure you have some play in your hole size. I made my tolerances too tight and ended up having to drill them out a bit. Fortunately they drilled out nice and didnt mess up the the solder mask. What does that mean in 0.1 mms? Please input your normal hole tolerance values for jacks and potentiom...
by nobody
Tue Mar 24, 2020 12:18 pm
Forum: Music Tech DIY
Topic: Front panel nuts for input jacks
Replies: 14
Views: 320

Re: Front panel nuts for input jacks

They have M6x0.75mm in "fine thread" but not M6x0.5mm :russian:
by nobody
Tue Mar 24, 2020 8:59 am
Forum: Music Tech DIY
Topic: PCBs as Front Panels ?
Replies: 179
Views: 14726

Re: PCBs as Front Panels ?

I used Altium, which is a PCB design tool. I believe there are freeware versions, but its cumbersome unless you know what you are doing. I just export the gerbers and upload them to nextpcb / jlpcb, etc etc. There is also eagle, kicad, and a bunch of others. I went with matte black finish - it looks...
by nobody
Tue Mar 24, 2020 8:53 am
Forum: Music Tech DIY
Topic: Front panel nuts for input jacks
Replies: 14
Views: 320

Re: Front panel nuts for input jacks

I have one from a sub miniature switch thats the same size. They are 1.56mm thick. They come with switches any time you buy them, I would think it would be easy to get them in bulk.

In other news thonk just shut down for like a month. Farts.
by nobody
Mon Mar 23, 2020 6:47 pm
Forum: Music Tech DIY
Topic: Front panel nuts for input jacks
Replies: 14
Views: 320

Front panel nuts for input jacks

Ive just spent a good 3 hours trying to find nuts for my Thonkiconn jacks. The only place I can find them is Thonkiconn (duh), and well they are in Europe and there is this virus thing every where. Does anyone know any other good sources? They are M6x0.5mm front panel nuts. They seem like they shoul...
by nobody
Mon Mar 23, 2020 6:39 pm
Forum: Music Tech DIY
Topic: PCBs as Front Panels ?
Replies: 179
Views: 14726

Re: PCBs as Front Panels ?

So I shouldnt post the 4k 120FPS video is what youre saying? ;)
by nobody
Mon Mar 23, 2020 3:10 pm
Forum: Music Tech DIY
Topic: PCBs as Front Panels ?
Replies: 179
Views: 14726

Re: PCBs as Front Panels ?

Got some aluminum ones from nextpcb. 2mm thick aluminum pcbs. 20 of them delivered was $80. Matte black finish. Came out pretty solid.

Also I might have some VCOs to trade soon ; )
by nobody
Sun Mar 22, 2020 10:25 am
Forum: Music Software
Topic: Spectrum Analyzer / Audio Analysis
Replies: 4
Views: 286

Spectrum Analyzer / Audio Analysis

Happy quarantine everyone. Im looking for a good, semi pro spectrum analyzer software that will work in real time. Ive seen a lot of freeware ones but hoping for something a little more professional. I would like to be able to do things like visualize the spectrum, have it show what musical notes ar...
by nobody
Mon Mar 09, 2020 6:22 pm
Forum: Music Tech DIY
Topic: 18-channel DIY Stereo Analog Vocoder
Replies: 263
Views: 28247

Re: 18-channel DIY Stereo Analog Vocoder

Is this project ever going to have a second run? Its too good not to. Im willing to front the costs to do a batch of PCBs. Are the board files around somewhere? I tried to contact glubsch but never got a response. :(
by nobody
Sun Feb 23, 2020 4:02 pm
Forum: Music Tech DIY
Topic: Digisound in eurorack
Replies: 23
Views: 2532

Re: Digisound in eurorack

I have 20 octogintas I am finishing up, and I need front panels for them. Do you have the CAD / art for them?

I will be willing to trade once they are done. I dont think Im going to need all 20 ;)

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