This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Friday, August 5, 2016

Korg MS-20 Filter

Switching it up this week and doing a Filter Friday. This one could be used for both synth and guitar/bass. It's a cool filter effect based around the LM13600/13700.

27 comments:

  1. by the way, do you have a schematic for it as a schematic and not a layout :) ?
    I want to make few pcbs of 4 of those on one pcb :)

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    1. Sure thing.

      http://i756.photobucket.com/albums/xx206/storyboards27/Mobile%20Uploads/E9B94169-591E-4021-A7C4-D929F7F7BD6E_zpsdxarmfs2.jpeg

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  2. 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. Thanks!

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    1. I don't know of any good walkthroughs. 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 largest), bend any leads and solder. Any connections left I make with cut offs. Good luck!

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  3. Thanks for that, it does help. I still have a few questions though. 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?

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    1. I solder them at the holes they come through as well as where leads join together.

      https://postimg.org/image/z32yj2chh/

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    2. Thanks!! Sets some ideas straight in my head.

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  4. isn't there a way to have a cv input?

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  5. i built it but doesnt seems to work properly

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    1. i also built it, used LM13700 and have some heavy noise and feedback, i can only use a 50% of each pot

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  6. In the PCB layout DPDT switch connections are wrong. Check the schematic to correct them and it will work fine.

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    1. Could you be more specific in how to correct the errors? Thanks!

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    2. I could be wrong on this but given the numbering convention SW2 (IC Input) SW5 (IC Output) SW 1/6 (sig input) SW4 (GND) SW3(Vref)

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  7. will this circuit work on 3.3v/ 5v?

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  8. output should be on volume pin 2 no? pin 1 to gnd and 3 to signal?

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  9. 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?

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  10. 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?

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    1. 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).

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  11. I hope someone verifies this one eventually, it sounds cool

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