Search found 106 matches

by Barnetric
Fri Jun 12, 2015 8:51 am
Forum: Music Tech DIY
Topic: Excelitas discontinuing VTL5C3 Vactrols & whole VTL rang
Replies: 96
Views: 8437

sorry to Vac-troll this thread.... Rolling your own vactrols seems like a good idea. Out of curiosity, I tried to read up on the performance tradeoffs for RYO. I've looked at some datasheets and tried to read up on what is special about the VTL spec. As far as I can tell: 1. Pretty large resistance ...
by Barnetric
Sat Jun 06, 2015 11:20 am
Forum: Music Tech DIY
Topic: solder iron question
Replies: 14
Views: 479

Technique is very important. Solder is going to go where the metal is hot and clean, so you want the tip to be heating both elements of the joint before you apply solder. Having a temperature controlled iron such as the hakko 888 is just really nice. Also, as Cane creek says, larger tips are good. S...
by Barnetric
Tue Jun 02, 2015 1:03 pm
Forum: Eurorack Modules
Topic: Filters... I seem to hate mine. What filters do you prefer?
Replies: 88
Views: 8633

I really like the Toppobrillo Multifilter.

It doesn't have a lot of coloration in most of the ways I use it. Its just a really good tool, especially as a bandpass or highpass.
by Barnetric
Tue Jun 02, 2015 12:44 pm
Forum: Music Tech DIY
Topic: Simple (but good) VCO designs with mods?
Replies: 4
Views: 1143

OKELK brings a lot of good questions and suggestions. There are tons of designs out there now depending on how involved you want to get. I second the recommendation to look at Music From Outer Space. He has a lot of good information on his oscillators and they vary in complexity. http://www.musicfro...
by Barnetric
Thu Dec 11, 2014 2:33 pm
Forum: Music Tech DIY
Topic: Korg DDD1 sampler board recreation
Replies: 29
Views: 4660

I think I misunderstood what you were saying about PCI. This looks like a family of connectors called FFC/FPC (Flat Flex Cable, Flat ? Cable) or sometimes LIF (low insertion force) or non-zif, though non-zif doesn't seem to exist as a standard. Actually none of those values are standardized enough t...
by Barnetric
Thu Dec 11, 2014 10:49 am
Forum: Music Tech DIY
Topic: Korg DDD1 sampler board recreation
Replies: 29
Views: 4660

Cool project! I'd be interested if you sell completed cards. I'd say beware scope creep. I enjoy simplicity and limitations in these old instruments. I like the DDD1 as is (but wish it had a better kick, even slightly better). That connector you are showing looks like LIF to me, not PCI. I have to r...
by Barnetric
Thu Dec 11, 2014 10:27 am
Forum: Music Tech DIY
Topic: FET to replace Pot for voltage controlled resistance?
Replies: 2
Views: 466

Re: FET to replace Pot for voltage controlled resistance?

and am just wondering how one might implement it for a situation where the wiper of a pot is connected to one of the other terminals? . Actually that configuration (basically a variable resistor) is what the FET can do. To emulate normal pot (two resistances tapped in the middle) would require 2 FE...
by Barnetric
Wed Nov 05, 2014 10:29 pm
Forum: Eurorack Modules
Topic: Help troubleshooting possible power supply issue with Braids
Replies: 10
Views: 707

Sounds like a power supply issue. Maybe the braids is further down that ribbon cable than the other modules? I don't like those ribbon designs and I'm not super familiar with the cell 90. You may see an improvement by putting the braids close to the origin of the cable. Power effect on modules can g...
by Barnetric
Wed Nov 05, 2014 9:56 pm
Forum: Music Tech DIY
Topic: VCS3 VCO simulation
Replies: 25
Views: 1839

I recommend putting real parts in for the transistors and diodes. Even if you don't go through the trouble of getting models for everything listed, maybe add some generics in there and see if that makes a difference. For the floating node, you can tie it back to the base with a huge resistor (like 1...
by Barnetric
Wed Sep 10, 2014 8:23 am
Forum: Eurorack Modules
Topic: Use of the word "Discrete" with regards to electro
Replies: 24
Views: 1712

I agree with the OP. The word has a meaning. It's false advertising to sell something called "discrete" if it doesn't meet the definition. Maybe we can argue about borderline cases like transistor arrays, but I don't think an IC op amp or OTA is a borderline case. If you just want to say your modul...
by Barnetric
Tue Sep 09, 2014 1:03 pm
Forum: Eurorack Modules
Topic: Use of the word "Discrete" with regards to electro
Replies: 24
Views: 1712

Yea if discrete means warmer and phatter, I certainly hear it in the E440. There's that shoot out video somewhere on the youtubes where it goes up against an Aion and a Macbeth. I didn't think anything could sound better than Macbeth stuff for that classic warmth but E440 prevails. Finally buying o...
by Barnetric
Tue Sep 09, 2014 9:18 am
Forum: Eurorack Modules
Topic: do you like the PEG from 4ms?
Replies: 59
Views: 5087

Love it!
by Barnetric
Tue Sep 09, 2014 9:18 am
Forum: Eurorack Modules
Topic: Use of the word "Discrete" with regards to electro
Replies: 24
Views: 1712

How about Transistor DIPs? I personally don't care what size a transistor/resistor/diode is, and if its encapsulated in an IC its easier to rework and repair. I'm quite happy to refer to a circuit with these types IC's as a discrete circuit. I still think of transistor dips as discrete even though ...
by Barnetric
Tue Sep 09, 2014 9:01 am
Forum: Music Tech DIY
Topic: Any circuit level tips for noisy logic chips?
Replies: 21
Views: 966

daverj wrote: Put a resistor between the CMOS outputs and where they enter any analog circuitry.
This is definitely worth trying. Even 50-100 ohms will keep the rise time low so there are not weird impulses traveling around your circuit.
by Barnetric
Tue Sep 09, 2014 8:54 am
Forum: Eurorack Modules
Topic: Use of the word "Discrete" with regards to electro
Replies: 24
Views: 1712

Use of the word "Discrete" with regards to electro

Hi everyone. Sorry for complaining PSA, but this specifically goes out to module makers... I'm still new here, but not new to electronics so I would like to clear something up: Discrete refers to a circuit made of transistors, resistors, capacitors, diodes, etc. In fact, discrete has traditionally m...
by Barnetric
Mon Sep 08, 2014 2:10 pm
Forum: Eurorack Modules
Topic: ((Video)) Need Turing Machine Diagnostic
Replies: 31
Views: 1724

Re: ((Video)) Need Turing Machine Diagnostic

Hey all, So I just sold my Turing Machine/Expanders to a fellow wiggler. It always worked perfectly for me but now, after about a week or so, he's saying it's giving him an issue. Def didn't get damaged in shipment cuz i packed em to last a nuke blast. He made a little video to show. Can anyone tel...
by Barnetric
Wed Aug 27, 2014 11:03 am
Forum: Music Tech DIY
Topic: Ghetto 5 V adaptor (7805)
Replies: 5
Views: 578

Re: Ghetto 5 V adaptor (7805)

Cool idea! I wish more bussboards had prototyping areas.
by Barnetric
Wed Aug 20, 2014 8:03 am
Forum: Music Tech DIY
Topic: When to draw polygons on PCBs ?
Replies: 2
Views: 309

If you are only making single-sided boards, I would stick to ground as the polygon (or top-side area fill). In 4 or more layers, you have the luxury to consider making power planes. (or more often power fills). If you want to beef up your power rails i suggest just making the trace width larger on t...
by Barnetric
Tue Aug 19, 2014 5:30 pm
Forum: Music Tech DIY
Topic: ADC separate analog ground
Replies: 17
Views: 1303

Do not put ferrite beads on signal grounds unless there is a known issue with RF that you are trying to block. With unbalanced signals the signal is relative to it's ground. Anything that happens to that ground also happens to your signal. Split grounds is a misnomer. It involves splitting power an...
by Barnetric
Tue Aug 19, 2014 10:34 am
Forum: Music Tech DIY
Topic: Adapting stereo panning circuit to quad?
Replies: 11
Views: 743

livefreela wrote:sorry man on the typo! must be a freudian slip - the air pressure in cali at the moment is laying waste to my already battered skull ;)!
No worries. I thought it was funny.
by Barnetric
Tue Aug 19, 2014 8:58 am
Forum: Music Tech DIY
Topic: ADC separate analog ground
Replies: 17
Views: 1303

10 bits is a really small dynamic range to be too concerned about noise. The TI demo is good. I wouldn't try to split entire ground planes (that is difficult to do in practice). If you would like to take some precautions, avoid sending a noisy digital return current directly through the AGND referen...
by Barnetric
Tue Aug 19, 2014 8:39 am
Forum: Music Tech DIY
Topic: Adapting stereo panning circuit to quad?
Replies: 11
Views: 743

"Barometric" LOL :banana: Livefreela is right though. This will not be a super easy diy project and it would be nice to use something already made for it. Frames looks really cool! The yusynth schematic you show is a VC implementation. What I'm talking about would be pot-controlled only. It would be...
by Barnetric
Mon Aug 18, 2014 5:51 pm
Forum: Eurorack Modules
Topic: A Dilemma of Sequencers and Keyboards
Replies: 45
Views: 2277

So, the audio damage sequencer looks really nice.

The PRO2 seems too overwhelming for me, so I haven't given it that close of a look.

Have you also considered the microbrute or minibrute SE?
by Barnetric
Fri Aug 15, 2014 8:02 am
Forum: Music Tech DIY
Topic: Adapting stereo panning circuit to quad?
Replies: 11
Views: 743

Typically I understand quad panners to have 2 dimmensions: Left Right and Front Back. (or X and Y). How are you imagining one control to move through this space? With simple mixers, you can add a Front Back pan pot by adding another pot and a few resistors. Pretty quickly I end up wanting to add mor...
by Barnetric
Thu Aug 14, 2014 8:29 am
Forum: Music Tech DIY
Topic: How to achieve a correct grounding?
Replies: 70
Views: 4604

I think there is a lot of good information about grounding and shielding in this thread, but it sounds like there is a bad connection in your circuit, especially if the hum is loud. Backing up a bit... you built 2 versions of this and only one has hum problems? Are both of them in plastic enclosures...

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