# Trouble with simple oscillator keyboard

**URL:** <https://lookmumnocomputer.discourse.group/t/trouble-with-simple-oscillator-keyboard/4755>\
**Category:** DIY STUFF\
**Created:** [March 10, 2022, 9:52pm UTC](https://lookmumnocomputer.discourse.group/t/trouble-with-simple-oscillator-keyboard/4755 "2022-03-10T21:52:19Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Bearjumpjump](https://avatars.discourse-cdn.com/v4/letter/b/e99b99/32.png) [@Bearjumpjump](https://lookmumnocomputer.discourse.group/u/Bearjumpjump)\
**Post date:** [March 10, 2022, 9:52pm UTC](https://lookmumnocomputer.discourse.group/t/trouble-with-simple-oscillator-keyboard/4755/1 "2022-03-10T21:52:19Z")

</div>

Hello everyone  
Im a beginner and trying to make keyboard from 15 bc337 oscillator, just like this video

[![](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/8/0/804b3b04e4ecc26f79c088f746707efbd3e2cf75.jpeg "DIY Polyphonic Synth Piano!") ](https://www.youtube.com/watch?v=OEwcKVPtzbo)

This is my progress picture

> **[DSC-0036 hosted at ImgBB](https://ibb.co/dgnB24S)**
>
> Image DSC-0036 hosted in ImgBB

> **[DSC-0038 hosted at ImgBB](https://ibb.co/wJ63zcT)**
>
> Image DSC-0038 hosted in ImgBB

> **[DSC-0037 hosted at ImgBB](https://ibb.co/ZNdgQkc)**
>
> Image DSC-0037 hosted in ImgBB

> **[ua8rsnc1nef41-1 hosted at ImgBB](https://ibb.co/8sg16XC)**
>
> Image ua8rsnc1nef41-1 hosted in ImgBB

My progress video “fail”

[![](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/f/8/f8a94911f9d31b9b2ccc5fe02e2c6dc10f27c942.jpeg "Fail 1") ](https://www.youtube.com/watch?v=HuOjEmZugVI)

When i turn the oscillator pot, it doesnt oscillate up

My progress video “sorta works”

[![](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/a/8/a846d446f7cbc91901c19cb751fba5814a904e54.jpeg "Sorta works") ](https://www.youtube.com/watch?v=DEDGVUczl2k)

I unplug the summing mixer, and just connect r7 1M (osc out) and ground into marshall ms2

I find those schematic on red\*\*it  
But i didnt make the amplifier, cause i use mini marshall ms2.

I still dont hook up the push button, and trying to make summing mixer based on lookmomnocomputer schematic, but it just humming, maybe i fried the tl072, ill buy new ic tomorrow.

Then i unplug the summing mixer, and just out after r7 1M and ground to my marshall ms2 speaker, and it sorta works, theres a lot of clipping, brrtt bbrt, when i turn up the volume

So how to make it sound clearer ?  
Also in the red\*\*it’s schematic, osc out (after r7 1M) means cv?  
Cause i wanna make a simple cool vcf

I hope, i provide all the information required  
Thank you

---

<div class="post-metadata">

**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 10, 2022, 10:29pm UTC](https://lookmumnocomputer.discourse.group/t/trouble-with-simple-oscillator-keyboard/4755/2 "2022-03-10T22:29:54Z")

</div>

> [@General advice for troubleshooting a module and asking for help](https://lookmumnocomputer.discourse.group/t/general-advice-for-troubleshooting-a-module-and-asking-for-help/2049):
>
> (This is a wiki post, please add and correct!) Look and see if others have had the same problem. Use the Discourse search facility to find topics where the module you’re building is discussed. Inspect your work. Verify all components are correct values. Look for solder connections that are rough, irregular, skimpy, dull, or missed completely (we all do that!) and reflow them. Look for solder bridges between pads and remove them. Check your power connection. If it’s a Eurorack style power cabl…