LM13700 dual VCA
This one is a version of benjiaos VCA, which in turn if a version of juanito moores VCA. I added a bit here and left out a bit there. I hope you like it.
Author: knopsl
EMF Mic
I’ve seen a video of one of m favouite youtubers andrew huang about an EMF microphone and he paid around 100$ for it. Then I googled a bit and found a makerzine article about a diy version. I built it and that’s what it looks like. I can only tell you it sounds wild and […]
Vintage fuzz box
There’s really not much to tell you about this. I found the schematic in a facebook group I think and stored it away. I wanted to try a vintage fuzz box circuit and checked the datasheet of the transistors used. They can be easily replaced by 2n3904s and so I built this really easy pedal. […]
Chaos LED
This project is a great solder practice for beginners. The layout is variable and I can only recommend this eyecandy. It uses blinking LEDs. You can buy them on ebayand AliExpress with different blinking frequencies and in various colors and sizes.
Envelope follower – my faceplate workflow and ‘ducking’
Part 1: module explanation Disclaimer: this is not a dedicated beginner module but I used it to explain my faceplate workflow. So I’ll put it also in the beginner section. I learned about ducking some weeks ago and checked out some different builds that make it possible. This is also my first hagiwo build using […]
Arduino Drumsampler – Jan Ostman build
I found this one on the lmnc forum and it seems the guy that developed the drumsampler isn’t maintaining his website anymore. I found it on the wayback machine and after some minor modifications with the help of the aforementioned forum/kind people I got it to work. Link to my Drive with two versions of […]
MS-20 Filter – LMNC layout
This is one of the most built filters and one of my most hated builds ever. I once bought waay too cheap 13700s on AliExpress and tried to build several VCAs and VCFs with them (FIVE!!!} and NONE of them WORKED. Then I gave up on OTAs. Months later I thought I’ll give it another […]
Patchpals 2 – VU- Meter
I searched for a VU meter build to be able to check signals for their level. This is nothing fancy really. It basically shows the voltage of the signal. Between every diode you have a drop of approximately 0.7V so you can take that as a rule of thumb. I usually use this if I […]
Super simple lofi delay – reverb module hack
I’m sure you’ve seen those modules on amazon or ebay ot AliExpress before and yes you can use them to build a lofi delay.
KRAAKDOOS a.k.a Cracklebox
This 60s noise touch synth uses the bodies resistance for creating unique noises. They reach from crackling to awesome fart noise and are a ton of fun to play. But be aware that it (mis-)uses a very outdated op-amp and you need to use exactly this one! – I bought mine on AliExpress 😏 The […]
knopsl modular 