Search found 2642 matches

by mskala
Wed Oct 28, 2020 10:24 pm
Forum: Music Tech DIY
Topic: VCO for synth 1V/Octave and 9v supply?
Replies: 10
Views: 8712

Re: VCO for synth 1V/Octave and 9v supply?

Seems like it shouldn't be hard to do what the guitar pedal people often do: use a equal voltage divider between the two sides of the 9V supply, an op amp to buffer it, and then call that midpoint "0V" and the two sides of the supply +4.5V and -4.5V. This is basically what you have to do in order to...
by mskala
Wed Oct 28, 2020 9:12 pm
Forum: Music Tech DIY
Topic: Can i put capacitors in parallel?
Replies: 15
Views: 241

Re: Can i put capacitors in parallel?

There's some very helpful calculators available on-line (free) that allow you to put in various cap values in series and/or parallel to determine the overall "total capacitance" (so to speak) of caps either in series or parallel. With a bit of effort even working out parallel~series combinations wi...
by mskala
Mon Oct 26, 2020 8:04 pm
Forum: Eurorack Modules
Topic: Is Divkid øchd the best Batumi alternative in less HP?
Replies: 38
Views: 1315

Re: Is Divkid øchd the best Batumi alternative in less HP?

An lfo you can’t change the speed of?! What if you need it just a certain speed and it just misses it. I don’t think my head could cope with that :woah: I love the idea of it but at the Same time also can’t understand the idea of it! You can change Ochd's speed, both manually and by CV. It's just t...
by mskala
Mon Oct 26, 2020 8:19 am
Forum: Music Tech DIY
Topic: Thread Size for Jack Nuts?
Replies: 7
Views: 124

Re: Thread Size for Jack Nuts?

Yes, M6x0.5 for the common Chinese-made 3.5mm jacks. It's not hard to find more or less identical replacements for the standard knurled nuts that come with the jacks, but you're not going to find a wide range of different colours and styles ready-made and available in small quantities for customizat...
by mskala
Sun Oct 25, 2020 9:15 pm
Forum: Music Tech DIY
Topic: Thread Size for Jack Nuts?
Replies: 7
Views: 124

Re: Thread Size for Jack Nuts?

M6 threads.
by mskala
Sun Oct 25, 2020 7:22 am
Forum: Music Tech DIY
Topic: Tutorial for moving from DIY PCBs to commercial PCBs for first time
Replies: 14
Views: 452

Re: Tutorial for moving from DIY PCBs to commercial PCBs for first time

I have designed some through-hole boards meant to have components mounted on both sides, and that calls for some caution because if one isn't careful about the order in which the components are added, it may be difficult to solder each component in place without interfering with nearby components. F...
by mskala
Fri Oct 23, 2020 8:23 am
Forum: Eurorack Modules
Topic: Is Divkid øchd the best Batumi alternative in less HP?
Replies: 38
Views: 1315

Re: Is Divkid øchd the best Batumi alternative in less HP?

I hope people considering Ochd will also consider my Fixed Sine Bank, which fills a similar niche.
by mskala
Thu Oct 22, 2020 8:33 am
Forum: Modular Synth General Discussion
Topic: Annoying videos
Replies: 22
Views: 733

Re: Annoying videos

any wording like "thanks to <Manufacturer> for helping out with this content" I take as "I am being paid not not say anything bad about this product and present it in a favourable light" This is why I've got a page of video-related disclosures on my Web site, saying who got what in exchange for mak...
by mskala
Wed Oct 21, 2020 7:11 pm
Forum: Music Tech DIY
Topic: have you ever wondered what integrated circuits look like?
Replies: 17
Views: 660

Re: have you ever wondered what integrated circuits look like?

If you like Zeptobars, you'll probably also like Ken Shirriff's Web log at http://www.righto.com/ .
by mskala
Mon Oct 19, 2020 9:20 am
Forum: Music Tech DIY
Topic: Anyone recommend a US source of reasonably priced tants?
Replies: 11
Views: 220

Re: Anyone recommend a US source of reasonably priced tants?

Non-polarized capacitors are usually bigger and more expensive, but you need them if you will be applying reverse voltage. There is no particular electrical advantage to polarized capacitors - a circuit meant to use them will work with non-polarized too - but the polarized capacitors are often cheap...
by mskala
Mon Oct 19, 2020 9:04 am
Forum: Music Tech DIY
Topic: Diode PCB Pattern. Square pad A or K?
Replies: 6
Views: 194

Re: Diode PCB Pattern. Square pad A or K?

I think of the cathode as positive, even if the diode is forward-biased and that puts the cathode at a more negative voltage. It took a bit of introspection just now to figure out why I think of it that way, but I guess it's because I studied chemistry before electronics. In an electrochemical cell,...
by mskala
Sun Oct 18, 2020 7:54 pm
Forum: Modular Synth General Discussion
Topic: what's so special about triangle core VCOs?
Replies: 12
Views: 701

Re: what's so special about triangle core VCOs?

Sawtooth-core oscillators need to reset at the end of each cycle. It takes a certain amount of time for the reset to happen, and very often, the charging current during that time gets lost. The lost current extends the cycle, lowering the frequency, and this effect is proportionally bigger at high f...
by mskala
Sun Oct 18, 2020 9:11 am
Forum: Modular Synth General Discussion
Topic: Annoying videos
Replies: 22
Views: 733

Re: Annoying videos

My heart goes out to all these unfortunate persons who are being strapped down and forced to watch annoying synthesizer videos.

81f.jpg
81f.jpg (91.74 KiB) Viewed 344 times
Edit: this picture, of course, shows Dr. Ludovico's controversial treatment for Gear Acquisition Syndrome.
by mskala
Sun Oct 18, 2020 8:44 am
Forum: Music Tech DIY
Topic: Diode PCB Pattern. Square pad A or K?
Replies: 6
Views: 194

Re: Diode PCB Pattern. Square pad A or K?

K, because that's where the identifying band on the component package is. But I wouldn't depend on only the pad shape as the way of indicating the orientation.
by mskala
Thu Oct 15, 2020 11:25 am
Forum: Eurorack Modules
Topic: Best discontinued modules
Replies: 91
Views: 2754

Re: Best discontinued modules

This is one of those things that perplexes me, whether modular or microphone. Especially the latter. Neumann microphone created one decades ago that everyone wanted. They sold lots of them despite the price. And they discontinued it. Now even more people want that mic and the only way to get it is ...
by mskala
Wed Oct 14, 2020 11:33 am
Forum: Modular Synth General Discussion
Topic: High-precision resistors in MFOS VCO/VCF inputs?
Replies: 9
Views: 245

Re: High-precision resistors in MFOS VCO/VCF inputs?

Answer: It's completely nonsensical, because the tracking is actually adjusted with trimmers, so you could use 1% resistors there. You probably wouldn't want to use 5% resistors, not because they aren't accurate enough, but because they drift more with temperature than metal film resistors. Then ag...
by mskala
Tue Oct 13, 2020 1:08 pm
Forum: Eurorack Modules
Topic: Results are in! Eurorack Essential Features Survey 2020
Replies: 29
Views: 1047

Re: Results are in! Eurorack Essential Features Survey 2020

People will say on a survey that such-and-such feature is absolutely essential, but then buy a module without that feature. This makes it difficult to measure actual buying decisions.
by mskala
Sun Oct 11, 2020 9:34 am
Forum: Eurorack Modules
Topic: Middle Path VCO
Replies: 12
Views: 768

Re: Middle Path VCO

It's not my plan to offer PCB/panel sets any time soon. I did that briefly when I first started out, and found that they created a lot of business problems for me. Given that I'm trying to make a living from this and not doing well at the moment - things are slowly getting better, but I'm still havi...
by mskala
Sat Oct 10, 2020 8:48 pm
Forum: Music Tech DIY
Topic: Better shapes for 90 degree PCBs in popular shallow irregular skiff?
Replies: 10
Views: 324

Re: Better shapes for 90 degree PCBs in popular shallow irregular skiff?

People want modules to be both narrow and shallow, and they have unrealistic expectations for both. Look at all the "List of modules for X function in Y HP 2020" threads, and all the micro-clone modules. As a manufacturer, you can't really win on that point; you just have to make your module the siz...
by mskala
Sun Oct 04, 2020 6:51 pm
Forum: Music Tech DIY
Topic: Solid copper wire for builds?
Replies: 15
Views: 437

Re: Solid copper wire for builds?

Phitar wrote:
Sun Oct 04, 2020 6:28 pm
Rarely use copper. Unprotected copper oxidizes and corrodes too fast to my liking.
Do you mean you use tinned copper, or something that's actually non-copper all the way through?
by mskala
Wed Sep 30, 2020 3:59 pm
Forum: Music Tech DIY
Topic: Chorus question.
Replies: 4
Views: 191

Re: Chorus question.

If the delay time is 200ms you're going to hear the delayed version separately from the original; it will sound more like an echo than a pure chorus.
by mskala
Wed Sep 30, 2020 12:24 pm
Forum: Eurorack Modules
Topic: Basic question regarding passive mult/mixers
Replies: 2
Views: 65

Re: Basic question regarding passive mult/mixers

I was told that summing signals through these could overload and potentially fry an input jack (i.e. never connect an output to an output). pricklyrobot already covered the resistor business with the "mixer/multiple," but just to comment on this point: the reason not to connect outputs directly to ...
by mskala
Sat Sep 26, 2020 7:33 am
Forum: Music Tech DIY
Topic: xicon minimum order on Mouser
Replies: 23
Views: 498

Re: xicon minimum order on Mouser

I'm surprised that they sell single resistors in any brand. It's hard to believe they make a profit doing so, even at the much higher price they charge for those compared to buying 10 or 100. I guess they do it as a loss leader, hoping you'll also buy bigger-ticket parts in the same order.
by mskala
Fri Sep 25, 2020 7:17 pm
Forum: Music Tech DIY
Topic: If a schematic doesn't shoe jack wiring, how do I wire the jacks?
Replies: 3
Views: 113

Re: If a schematic doesn't shoe jack wiring, how do I wire the jacks?

groffcole wrote:
Fri Sep 25, 2020 5:23 pm
It doesn't include the jack for the input and output signals. How would I connect this to a standard Thonkiconn mono eurorack jack? My first thought it to connect the signal to the tip of the jack and then ground to the ground terminal of the jack.

Is it that easy?
Yes.
by mskala
Fri Sep 25, 2020 3:02 pm
Forum: Music Tech DIY
Topic: Discrete OTA issues
Replies: 23
Views: 594

Re: Discrete OTA issues

OTA output is Q4,Q2, which is a current output. discrete OTA + C1 + U1 make a 1st order VCLP filter . With the right input polarity the loop is closed for DC and there is no need for any resistor to GND. That explains something I wondered about, which was why the OP kept talking about a "filter" wh...

Go to advanced search