Hey guys,
Breadboarding and prototyping this LM13700 VCF. Currently having issues with hearing the filter and I'm wondering if I've done something wrong with voltage referencing.
It's based on Ray Wilson and Kassutronic's designs.
Let me know if anything stands out.
Bonjour a tous :) j'ai une question simple : pensez vous que j'ai le panier nécessaire pour la construction et programmation d'un premier appareil ? Je pensais plutôt à un controleur midi qu'à un synth, mais si vous avez des recommandations je suis preneur !
J'ai un peu d'expérience et de materiel en électronique et soudure.
J'aimerai bien fabriquer un appareil qui pourrait permettre de la modulation avec nunchuk
Merci d'avance pour vos conseils !
I'm building the Erica Synths Bassline kit from Synthrotek. A few components were included that seem incorrect on the included BOM vs. the PCB and old BOMs. This is all on the Logic board. Included BOM is pictured.
The included BOM says R93/R118/R131 are 33k resistors but the board and old BOM say 39k/22k/56k. R94 is 100k on the included BOM but the board and old BOM say 220k. And R119 is 330k on the included BOM but the board and old BOM say 470k. Better to go with what's included in the kit and indicated on the included BOM, or change these out for what's marked on the board and old/online BOM?
Also the included ceramic disc capacitors are marked There are three 392 (3.9nF) ceramic capacitors included but the BOM says they should be 224 (220nF) C37/C42/C45. Maybe it's just a kitting error.
hello r/synthdiy ! so i'm new here, are there any schematics on how to make a sampler??
Hi All,
I was wondering if anyone had any strong opinions on any particular dev boards or oscilloscopes. I intend to make some mods for my audio mixer, probably powered by the befaco chiki power. Bread boards aren't cutting it but I also do not think the scale of a full EE scope and power bank will be required. I am staying within +/-12V.
I took a peek at the Erica Synths EDU Labor and I do not think I will be using all of its features as I am a bit more guitar-pedal focused and need more pots rather than signal generators, but I have seen a few on Tindie and was wondering if anyone has a dev board they like from the sellers there?
Does anyone have any strong opinions on the Korg NTS-2 for a scope as well? It seems right up the alley of this kind of project where I am still in audio domain and at most I will be testing stereo pairs.
Starting this project is still a few months out so I have time to go shopping, I was just wondering if anyone has any strong opinions one way or another on measurement equipment.
Thank you all for your time and happy tinkering!
I recently thrifted this KORG Triton LE 61 key workstation, I wasn't able to test it in the store, and when I brought it home to open it up, it was full of dead bugs. I'm an amateur when it comes to repairing electronics, especially synths. It didn't turn on at all when I tried to test it. I just want to know whether it's worth trying to clean and fix, and if I'll even be able to at all. I wasn't able to discern any glaring issues by myself (Apart from the dead bugs..)
If anyone could offer any tips on how to clean it, and what I should do to determine the problem, it would be greatly appreciated. Please take into account I am very new to electronics so I don't have much repair knowledge under my belt.
Thank you parasitstudio
https://parasitstudio.com/pedals/quantumdefrakulator/
Disappointingly the step button doesn't work, I wish it did, no idea why it doesn't.
r/modular has been extremely kind to our little modular company. By that I mean that people have been welcoming and we’ve gotten a bunch of sales through this place. So it seems like a good venue to tell people to update their Time Machines.
The Update
We discovered a bug where a number of things could add little clicks to the audio. Turning the spread knob rapidly. Turning the t knob in certain situations. Other things. The update to Time Machine to support the VCA Expander made this worse, which helped us uncover the cause and fix it.
This is a link to the new firmware and here I am explaining how to update Time Machine:
https://youtu.be/0miEWZygDfI
Your Time Machine will now operate cleanly and quietly, like the [figuratively!] well-oiled machine you purchased. Oh, and the lights at boot now go right-to-left, so you can tell you’re running the update. Thank you for you patience.
The Sale
Just a small summer sale. Get a few buck off of every module we aren’t sold out of. No promo code, we just lowered our prices for a bit. Check it out?
Trying to access MKs manuals for his diy kids on the Erica Synths website and I keep getting 404 PNF.
Has he finally paywalled them?
Apologies if this has become an FAQ, but I can't find anything related to this.
A few weeks ago, I launched noodlerack, which is a browser-based modular synth.
This week, I'm back with a tracker in your browser: playrowbot.com
I've always been intrigued by the tracker workflow, even though I'm not very good at it. But I do enjoy playing around with it!
I noticed there wasn't any tracker you can immediately just jump into and start having fun, so here it is. No logins, no ads as always.
Hope you enjoy!
So I’ve built part 2 of Moritz Klein’s VCO series on my Erica Synth Labor, and everything appears to be working, but I’m running into difficulty connecting my sequencer. I’ve tried using the KB output on my Mother-32, as well as the pitch output of a Keystep Pro, and neither have worked (I also just tried gate outputs to see if I could get any signal, but to not avail).
I’ve got the output plugged into a 3.5mm audio jack, and I’ve got the ground pin tied ground and the tip going into the input of my transistor. I’m using a BC547C transistor instead of the 548C he uses in his video, but other than that everything should be there same.
I’ve also tried changing out the resistor value in the voltage divider from the 4k he uses.
Any ideas on what I could be doing wrong?
I’m new to Eurorack gear, but have been building guitar pedals for a while. I put together a couple diy kits and decided I wanted a clock module with some customization. Lots of ai help as I understand schematics, but not coding and I made sure to verify output and voltage safety all along the way.
Output a set to x24 for Gris
B set to x1
C and D both have a swing modifier, independent multiplier/dividers as well as probability and Euclidean rhythms.
I also added 8 preset slots to load and save settings.
I still have no idea what I’m doing, but it’s a lot of fun making these ideas come to life!
I've just acquired a pretty broken RE-303 and I want to have a look to see if I can identify the problem.
I've downloaded the build guide and the original 303 manual and am planning to get it open and test certain points within the circuit. I'll either get it to a tech with a better understanding of what exactly is wrong, or try to fix it myself if it's as simple as a component or two needing to be swapped out.
My question is what do I need besides an oscilloscope and a multimeter? Is there a way to power the synth that isn't from the mains to be doing the testing? Also just any general advice if anyone has done something similar would be greatly appreciated
Hi all.
I'm thinking of building a big box-o-knobs for sending MIDI CC/NPRN to control various synths. All the ones I've seen use some kind of rotary encoders - which is understandable. I was thinking that it could be a better interface if, instead, I had a bunch of essentially mouse wheels in a row since you could use them with just a single finger. Instead of an LED ring, I could just use an LED bar graph.
Anyone seen anything like this? Comments? Problems? The electronics would be almost identical to rotary encoders. I could even make it modular and be able to switch out groups of knobs/wheels.
Thanks!
Hello Y'all,
Excuses if this question is asked a lot. Tried to search the forum, got some answers but need to sanity check:
Im trying to get 5V for a STM32 chip from the 12V line.
Is this circuit correct? Or is there a better way of doing this..
It's basically the Moritz Klein schematic, with a AAMS1117-5.0 regulator for 5 volts, and some caps for filtering..
Any thoughts or feedback?
This is not going to be the layout, I just wanted to make it clear :)
Thanks in advance!
Sorry about the poor video quality, my webcam is...
I'm currently working on a new firmware for ZicXY, and it's looking quite promising. It's still a work in progress and isn't yet available as a ready-to-use OS image for download. However, if you're a developer or enjoy tinkering, you're can find the source code on my GitHub repository: https://github.com/apiel/zicBox
Dear Community,
I am reworking my line level input-module, LIN. This module boosts signals from headphone outputs to Eurorack levels.
Right now its just an inverting opamp amplifier before it goes to a high gain VCA. I was wondering if adding an 1:1 audio transformer on the input would be a more "clean" solution? A small 600:600 transformer is what I had mind, would that work? It should remove ground offsets / humming.
Also, is it still gonna be possible to feed Eurorack level signals into the module with the transformer installed? This is a bonus feature to allow for clipping/distortion.
I attached a picture of my idea.
Please let me know what you think.
EDIT: I didn’t have the TL072 inverting input tied to the output. That fixed it
I’m using the Erica Synths Labor to build a VCO, following along with Moritz Klein’s videos, and while I’m only on part 2, I’m not getting any signal when I plug it in. If I plug straight out of the Schmitt Trigger then I get a signal, but once I built the rest of the circuit and hook up the output from my voltage divider, I get nothing. I’ve changed out all the components including the TL072, but no dice. I also originally didn’t have the TL072 input 2 tied to ground, but it doesn’t seem to matter either way. Also FWIW I had this same problem for the part 1 build, before I added the transistor and potentiometer.
