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Post a Comment. Now here's a DIY project that will instantly make your synthesizer sound amazing! Two awesome Korg MS filters in one module. I wasn't too pleased with the performance of the Prophet 5 lowpass filter so I decided to remove it and put a new filter in its place.

I've seen lots of videos about the Korg MS and really like the sound of it. I noticed that synthesizer has two nearly identical filters next to eachother; the highpass- and the lowpass-filter, so I wanted to emulate that in my own synth.

So I set out to build two of the 'Late MS filters' by Rene Schmitz, and fit them behind a single panel that was the size of the old Prophet 5 filter that I took out.

It was a tight fit to put all the knobs and switches on but it worked out beautifully in the end. The schematics and layout I used are just the same as the ones I used in article 12 of this blog, so if you want to build your own dual filter arrangement you can go to the Korg MS20 filter page and build TWO of those.

Well, I say 'do not' but of course you are free to build it as you wish, but having a highpass- and lowpass filter side by side already gives you the bandpass option anyway.

Look Mum No Computer Shows How To Build A Korg MS20-Style LP Filter

And in my case, having so little space available on the panel, I could well do without two extra useless switches. Here's a picture of the panel I made:. Here's a look at the different sounds this filter can produce. The phaser effects come from the special effects unit and not from this filter :. Labels: analogbuildCircuitconnectionsDIYdualfilterhighpassKorglayoutLowpassmodularMS20schematicssoundstripboardswitchsynthesizervintage.

No comments:. Newer Post Older Post Home. Subscribe to: Post Comments Atom.The MS Kit is a true-analog, scale reissue of the MS, with both filters built in the more aggressive early production filter and more mellow late production one.

Every details has been replicated, right down to the packaging, which includes a letter from the original MS engineers and the President of Korg, Inc. Just like the MS mini, development of the MS Kit was led by the original engineers themselves, who spared no effort to perfectly replicate the circuitry of the original unit.

When it was necessary to substitute a part, the engineers made the decision based on their own ears, ensuring that the exact sound of the original unit has been reproduced. The MS Kit comes dissembled, and can be put together with simple tools some includedproviding the user with a bit of the experience that often went hand-in-hand with ownership of vintage modular analog gear.

No soldering or understanding of circuit diagrams required. The old one will not have MIDI if you really need itwill have a captive power cable ughand most importantly, will need some TLC in the very near future. The old components will have a duller sound and the keybed on the new one will probably be nicer. You will have to settle for one filter or the other.

And finally, this one will most likely come with a warranty. Seems like alot for a DIY project? Although, both sets of filters is quite sexy. I want a sub37 badly, but an MS 20? And audio quality. Yes, for only the cost of two MS minis plus a MicroBrute you can put together your own full-sized MS that sounds the same. It cannot be that expensive! It makes no sense. Interesting approach.

If I had bread to throw away I would most def get a couple and sit on one depending on how limited they are going to be. Ofcourse the price will be cheaper than listed by a couple hundred or so.

Memory, stable pitch, better builds sometimesetc. It takes a good instrument to bring that out, but it only happens when you put some IN first. There can always be more innovation. There was probably a fair amount of design work to work out the product logistics, packaging, instructions, support, etc. Since Korg released that successful little bits kit, they probably realized what an under-exploited market that is.

However, a mini vector synth Microwave? Yes you are, yes you are, have a PCM memory card what a good boy.I want to make few pcbs of 4 of those on one pcb :. Sure thing. This looks like a great project! I've built a fair amount of pedals at this point but I've only done one perf build, and it was pretty messy.

Can you point me in the direction of a good walkthrough about building on perf? I'm curious about the best way to make the connections on the underside of the board. Should I use wire, or try to bend the leads around, something else I haven't thought of? There are so many great projects on here, think it's about time I did some learnin' about perf. I don't know of any good walkthroughs.

ms20 filter diy

Personally I bend the leads. I start with resistors and diodes, bend all the leads and solder accordingly. Then I populate the caps smallest to largestbend any leads and solder. Any connections left I make with cut offs. Good luck! Thanks for that, it does help. I still have a few questions though.

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Do you solder the leads at bends or just where the components go through the board? Would you maybe be willing to post a few pictures of the front and back of one of your builds so I could get a visual idea of how things look?

I solder them at the holes they come through as well as where leads join together. Check the schematic to correct them and it will work fine. I wanted to build a stereo version of this to warm up my digital synths, but I still read the tag "unverified" below this post. Such a pity Has anyone finished it? From reading the schematic; shouldn't lugs 2 and 3 of the volume be the other way around with lug 2 being the output like in most conventional layouts? Yes, but it works the same when you reverse those lugs.

It's just the lesser used convention tho DBA uses it all the time. I Think you can now tag it verified, mine seems to work properly, however with a few strange behaviour. When Reson pot is turned fully CW it produces a loud "mic-feedback" sound ; when Freq pot is turned fully CCW it totally cuts the sound. I don't know exactly how to use this with my bass :o but I'm sure I 'll figure out!

I use a LM and wired the switch exactly like described on the layout. I'll try to debug the pots issues adding some resistors in paralell here and there and will come back to tell you more. And many thanks for this blog and your great work! Perhaps this filter is not intented to be used with a guitar or a bass?Post a Comment. This is the last of the three filters I wanted to include in my DIY synthesizer project, for one because Sam Battle from LookMumNoComputer raves about it and it sounds amazing in his videos and the other reason is that it has the option to go between Low-Pass and High-Pass and I didn't have a High-Pass option in the synthesizer yet.

Of course, combining this filter in High-Pass mode with one of the other two lowpass filters gives you the bandpass option too and with a much better sound! Check out the video at the bottom of this article to hear this filter in series with the Moog Ladder Filter. A really cool combination.

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I've tried it and it works up to a point but I don't find it useful at all and in order for it to work properly you'd have to make several changes to the original schematic. As this is not the point of this article, this option is not included here. As he mentions in the text with his schematic, the gain of the opamps is hightened so you can get some weird sounds out of this.

ms20 filter diy

That's certainly true. It doesn't sound like the Moog Filter but it does have that 'ripping the fabric of the universe' synth sound and it's a real Speaker Ripper!. It's a ' Sallen-Key ' type filter and it produces really divers sounds.

This filter is self oscillating in both the Low and High-Pass configuration. In Low-Pass you can get oscillations on the low end and they go very low, like 10Hz low and in High-Pass the oscillations occur on the high end. When it's overdriven the two yellow LED's light up. It's possible to overdrive this filter so much that it switches off.

Bleepboxes Episode Eleven: Korg MS 20 Filter DIY

With my filter in Low-Pass mode, if I have Resonance turned all the way up and I turn Cut-Off all the way up too, it will be too much for the filter to take. But that's no problem, I simply turn Cut-Off back and turn Resonance back by about a quarter turn, and the filter will kick in again. Of course this will vary with component tolerances etc. The dual MS filter I describe in article 15 suffers way less from this problem.

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You simply have to learn its limits. But it does mean you can get everything out of this filter that it has to offer. It is also greatly dependent on what you feed to the filter. The volume levels can be too much to take for this filter.

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That's probably in part due to the hightened gain of the buffer opamps, but I don't mind it. You can tell beforehand when the filter is about to clip and adjust the potmeters accordingly.

The brightness of the LEDs is a great help in this. Use a little bit of attenuation and it all works perfectly fine.The filter is switchable between Lowpass and Hi Pass modes, and features an updated diode gain stage in the resonance section. The build guide is located here. The CV input is an attenuverter, allowing for dynamic control-voltage of the cutoff.

All jacks, knobs, and other components are soldered directly to the PCB.

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We recommend this kit as the third or fourth module you build. It is easy, and can be built in a single sitting. If it works, you are ready to build other modules. That is the "standard" in other formats for an oscillator. In Eurorack there are no standards for this.

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Here is a scope showing 4 different oscillators in my rack. The green signal is 8v peak to peak, the blue is about 5, the yellow is a measley 4v, and the red looks like 5 or 6. As with most OTA filters, as well as diode ladder, cascade, CEM, and SSM designs, wherein resonance is achieved via negative feedback, the non-resonanced signal the passed signal will drop.

When used in conjunction with a VCA, this is trivial. There are ways to compensate for this by injecting some of the original signal into the feedback loop, or adding extra gain circuitry, but this has its own issues, and was avoided in this design, in large part for authenticity. In the "normal" mode, there is a normal volume drop, and in the "extended resonance mode" you will see a greater volume drop to the "passed signal.

Great squelchy MS20 Filter. Really easy build, and recreates the madness of the original. A welcome addition to the smoothness of standard ladder filters. Big, fat, juicy filter sweeps!!! Love it! Alec K. Redfearn verified owner — March 27, Highly recommended.

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Took me an hour or so to build as just my third project, but everything worked perfectly and instructions were well-documented. Apart from it being build-able by a complete newbie, it sounds pretty incredible, and with the trim pot for resonance you have access to a HUGE amount of gain and squirrely-ness if you want it.

Would highly recommend and I think I may come around and get a second so I can run them in series.

ms20 filter diy

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This filter is killer and easy to build. Love mine! Rated 5 out of 5. Rated 5.A Kenton Pro can do this but is way not economical for this task. So, the mod could be easily carried out without having to remove the Knob Panel thank goodness As usual, i wanted to keep things tidy and semi-detachable. There are extra non used PCB space at the side and i mounted a small connector there.

The new CV wire then goes to a K resistor then goes to the right side of the front panel, where i mounted a little K Trimmer. What it looks like underneath: It's easier to have a trimmer here, rather than a Pot. Initially I tried a Pot and mounted it on the back, and i found you could easily detune and move the pot by mistake. So a trimmer is a better solution, after you've tuned it, you can cover it up. Finer or further tuning could be done via the Master Tuning Pot.

So this is how it's like now, after all has been done and it's hidden under a protective cap. On the schematics, it looks like you solder to the legs of R10 or R In fact it's actually easier, because pad point 56 is actually on one leg of the PW Pot.

What I did was just tap a wire to the leg of the PW Pot. I dunno, this maybe semi PWM, since the original PW stuff is still in tact, but I really can't be bothered to do extra work on this if it involves removing the Pot panel!!

And the PWM Input Jack goes to the rear back panel: well, actually I can still use a long patchcord to route this back to the front panel This is just like inserting the jacks half-way. Well, my aim for modding is to add functions and make the synth work the way i wanted it to - so i feel i should go thru the pain in removing the 2x35 screws For this mod, i just needed to replicate the switching action of the jack sockets.

Since i have the External tapped to the TIP of the socket, basically it's just a matter of a SPST switch that acts like the inserting of the jack which breaks the signal on the switching action on the socket. So, de-solder the jack socket, bend up or remove the side-tip, so that it won't get re-inserted to the PCB.

Then solder the socket back. These then go to an SPST switch. BUT it might be troublesome if later i want to do additional work on the panel box, so these switches have to be easily removable if needed. So instead of mounting them directly to the front panel, i mounted them above the panel box as an extension: This is very DIY! I needed some thin metal that I can use to support and mount the switches. It would be nice if i can mount the metal by screwing on the jack sockets rather than extra screws.

So I found an old PC fan cooler that the fans are long not working, remove the fans and cut out parts of the metal grid, and luckily it fitted nicely! Problems : 1. I don't want to remove the Knob panel to deal with the PCB. De-soldering R and let it fall out is too risky. The filter fall effect is pretty nifty, i might use it sometimes, so i'd like to keep R there Just solder 2 wires there to an SPST switch.

So I drilled a little hole on the front panel near the Release knob and mounted it there:. Next: Midi-fying the MSSam Battle, who describes himself as a "musician and inventor", takes a high-energy approach to his videos in which he shows you how to create synths and other instruments entirely from scratch.

In his latest video below, he's demonstrating how to make a Korg MSstyle low pass filter - so strap yourself in and check it out! In amongst the manic presentation is some great advice on how to prep and build your own synth hardware - you might want to pause for breath if you're actually following along with your soldering iron - but in the end, it really works!

There's more modular madness on his channel page too. More articles by this author. Hollin Jones was classically trained as a piano player but found the lure of blues and jazz too much to resist. Graduating from bands to composition then production, he relishes the chance to play anything with keys. A sometime lecturer in videographics, music production and photography post production, Hollin has been a freelance w Read More. Create an account or login to get started! Audio is your ultimate daily resource covering the latest news, reviews, tutorials and interviews for digital music makers, by digital music makers.

Log In Create Account. A NonLinear Educating Company. Brace yourself for a tornado of synth-based advice as Sam Battle runs you - quite literally - through building your own low pass filter in hardware.

If you want to learn DIY, modular and eurorack synth design and build skills at a slightly more manageable pace, be sure to check out the pro video courses in the Ask. Hollin Jones More articles by this author. Related Videos.

ms20 filter diy

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