# MS20 VCF Schematic **URL:** \ **Category:** DIY STUFF\ **Created:** [December 26, 2020, 3:42pm UTC](https://lookmumnocomputer.discourse.group/t/ms20-vcf-schematic/2552 "2020-12-26T15:42:38Z")\ **Posts on this page:** 10\ **Page:** 2
**Author:** ![lu.caas](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/lu.caas/32/12420_2.png) [@lu.caas](https://lookmumnocomputer.discourse.group/u/lu.caas)\ **Post date:** [February 14, 2021, 1:14am UTC](https://lookmumnocomputer.discourse.group/t/ms20-vcf-schematic/2552/24 "2021-02-14T01:14:11Z")
I tested it and IT WORKS !! ---
**Author:** ![dreamcoil](https://avatars.discourse-cdn.com/v4/letter/d/f1d935/32.png) [@dreamcoil](https://lookmumnocomputer.discourse.group/u/dreamcoil)\ **Post date:** [March 26, 2023, 12:12pm UTC](https://lookmumnocomputer.discourse.group/t/ms20-vcf-schematic/2552/25 "2023-03-26T12:12:29Z")
Just running through the schematic @lu.caas posted and getting a bit confused with the IC connections. When I look at say, the TL074, it appears to have the 4k7 resistor and 4.7nF cap connected on pin 14 per the stripboard layout. In the schematic they are connected to pin 1. Likewise, the stripboard layout shows the input jack connecting via a 10k resistor to pin 4 on the LM13700 whereas the schematic gives pin 13. Am I looking at this right? I’m new to all of this so apologies if the answer is obvious 🙂 ---
**Author:** ![analogoutput](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/analogoutput/32/29663_2.png) [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)\ **Post date:** [March 26, 2023, 1:11pm UTC](https://lookmumnocomputer.discourse.group/t/ms20-vcf-schematic/2552/26 "2023-03-26T13:11:37Z")
The TL074 is symmetric, four identical op amps connected to pins 1–3, 5–7, 8–10, 12–14. I don’t know why the schematic shows a different assignment of op amps to functions but functionally it’s the same. Likewise it looks like the two OTAs in the LM13700 are switched around but again the two are identical so it doesn’t matter. For consistency with the stripboard just renumber the pins on the schematic: - TL074 pin n → pin (15–n) (except pins 4, 11) - LM13700 pin n → pin (17–n) (except pins 6, 11) and I think it’ll be correct. (But someone should verify this.) ---
**Author:** ![karsten\_h](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/karsten_h/32/24451_2.png) [@karsten\_h](https://lookmumnocomputer.discourse.group/u/karsten_h)\ **Post date:** [March 26, 2023, 2:40pm UTC](https://lookmumnocomputer.discourse.group/t/ms20-vcf-schematic/2552/27 "2023-03-26T14:40:48Z")
![image](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/0/7/0733d39c5e2148fe119359264dbbca820609b948.jpeg) > **[Synthesizer Build part-12: THE KORG MS20 FILTER.](https://www.eddybergman.com/2019/12/synthesizer-build-part-12-korg-ms20.html)** > > Korg MS20 with highpass bandpass and lowpass option stripboard layout DIY synthesizer build how do the designs actually differ? where do we find the look mum no computer layouts? ---
**Author:** ![analogoutput](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/analogoutput/32/29663_2.png) [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)\ **Post date:** [March 26, 2023, 4:03pm UTC](https://lookmumnocomputer.discourse.group/t/ms20-vcf-schematic/2552/28 "2023-03-26T16:03:14Z")
LMNC layout is shown [above](https://lookmumnocomputer.discourse.group/t/ms20-vcf-schematic/2552) ---
**Author:** ![karsten\_h](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/karsten_h/32/24451_2.png) [@karsten\_h](https://lookmumnocomputer.discourse.group/u/karsten_h)\ **Post date:** [March 26, 2023, 6:56pm UTC](https://lookmumnocomputer.discourse.group/t/ms20-vcf-schematic/2552/29 "2023-03-26T18:56:50Z")
of course it is, i am grateful for that but do we have a library or folder or github or somewhere with collected layouts or something? and / or is there some additional explanation about this particular layout refering to where it comes from and why it is as it is? and / or how it works? ---
**Author:** ![dreamcoil](https://avatars.discourse-cdn.com/v4/letter/d/f1d935/32.png) [@dreamcoil](https://lookmumnocomputer.discourse.group/u/dreamcoil)\ **Post date:** [March 26, 2023, 8:59pm UTC](https://lookmumnocomputer.discourse.group/t/ms20-vcf-schematic/2552/30 "2023-03-26T20:59:33Z")
Ah of course, that makes perfect sense. Good to have it noted here for anyone going through it. Thanks for clarifying that 🙂 ---
**Author:** ![analogoutput](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/analogoutput/32/29663_2.png) [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)\ **Post date:** [March 26, 2023, 9:28pm UTC](https://lookmumnocomputer.discourse.group/t/ms20-vcf-schematic/2552/31 "2023-03-26T21:28:23Z")
You can find links here > [@List of LMNC modules and synth projects](https://lookmumnocomputer.discourse.group/t/list-of-lmnc-modules-and-synth-projects/3935): > > LMNC Kosmo Modules Module Store link Project link Discourse link 1007 MIDIMUSO MIDI-CV [store](https://store.lookmumnocomputer.com/collections/modules/products/1007-midimuso-midi-cv-module-pcb-panel-chipset)[project](https://www.lookmumnocomputer.com/1007-midi-cv)[discourse](https://lookmumnocomputer.discourse.group/t/1007-midimuso-midi-cv/1446) 1008 MIDI TO TRIGGER [store](https://store.lookmumnocomputer.com/collections/modules/products/1008)[project](https://www.lookmumnocomputer.com/projects#/1008miditotrig)[discourse](https://lookmumnocomputer.discourse.group/t/1008-midi-to-trigger/6199) 1113 PERFORMANCE FILTER [store](https://store.lookmumnocomputer.com/collections/modules/products/1113-kosmo-2-0-performance-filter)[project](https://www.lookmumnocomputer.com/performance-filter)[discourse](https://lookmumnocomputer.discourse.group/t/1113-performance-filter/14) 1114 FILTER GRR [store](https://store.lookmumnocomputer.com/collections/modules/products/1114-filter-grr)[project](https://www.lookmumnocomputer.com/1114-funky-filter)[discourse](https://lookmumnocomputer.discourse.group/t/1114-funky-clipping-filter-vca/2090) 1145 VCLFO [store](https://store.lookmumnocomputer.com/collections/modules/products/1145-kosmo-vclfo-lfo)[project](https://www.lookmumnocomputer.com/vclfo)[discourse](https://lookmumnocomputer.discourse.group/t/1145-vc-lfo-module/15) 1148 MODULATION STATION QUAD LFO [store](https://store.lookmumnocomputer.com/collections/modules/products/1148-modulation-station-quad-lfo-pcb-panel)[project](https://www.lookmumnocomputer.com/projects#/1148-quad-lfo)[discourse](https://lookmumnocomputer.discourse.group/t/1148-quad-vclfo/4065) 1153 BOUNCE BOUNCE BOUNCE BOUNCE BOUNCE BOUNCE BOUNCE [store](https://store.lookmumnocomputer.com/collections/modules/products/1153-bounce-bounce-bounce-bounce-bounce-bounce-bounce)[project](https://www.lookmumnocomputer.com/1153bounce)[discourse](https://lookmumnocomputer.discourse.group/t/1153-bounce-bounce-bounce-bounce-bounce-bounce-bounce-bounce/2499) 1157 MINI ADSR [store](https://store.lookmumnocomputer.com/collections/modules/products/1157-mini-adsr-chipset)[project](https://www.lookmumnocomputer.com/1157-mini-adsr)[discourse](https://lookmumnocomputer.discourse.group/t/1157-mini-adsr-module/359) 1158 VOLTAGE CONTROLLED… ---
**Author:** ![karsten\_h](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/karsten_h/32/24451_2.png) [@karsten\_h](https://lookmumnocomputer.discourse.group/u/karsten_h)\ **Post date:** [March 27, 2023, 4:12am UTC](https://lookmumnocomputer.discourse.group/t/ms20-vcf-schematic/2552/32 "2023-03-27T04:12:56Z")
amazing! such an abundance of resources \<3 love that! but the MS-20 project is not featured there… ---
**Author:** ![analogoutput](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/analogoutput/32/29663_2.png) [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)\ **Post date:** [March 27, 2023, 4:49am UTC](https://lookmumnocomputer.discourse.group/t/ms20-vcf-schematic/2552/33 "2023-03-27T04:49:55Z")
It’s “SIMPLE LOW PASS FILTER”. [Previous page](https://lookmumnocomputer.discourse.group/t/ms20-vcf-schematic/2552.md?page=1)