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PinkDuck

@PinkDuck@kbin.social
PinkDuck,
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I'll start with some more obvious ones :)

Moritz Klein's youtube channel has a lot of very educational videos on how various synth modules work and how to build them
https://www.youtube.com/channel/UCzfW6SlNEyxmAPtdr3n-_Og

PinkDuck,
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SynthDIY WIKi has a looot of info starting from some basics on how electronic components work to synth design articles (obviously) to some books recommendations on related topics. The navigation is a little bit convoluted on this website, it's probably easier to look through All Articles page to find something you need
https://sdiy.info/wiki/Main_Page

PinkDuck,
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Music From Outer Space has a lot of interesting projects. I personally didn't dig deep into it, but it's on my todo list :)
http://musicfromouterspace.com/index.php

PinkDuck,
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Nice catalogue of various open source hardware synth projects
https://diy-synths.snnkv.com/

PinkDuck,
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Not very active youtube channel, but they have some nice tutorials on how to use KiCad to design your own PCBs and how to build a mixer module
https://www.youtube.com/@eurorackDIY/videos

PinkDuck,
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Hagiwo has tons of cool eurorack modules projects. The blog is in japanese, but online translators can help, and the schematics should be easy enough to understand even without text
https://note.com/solder_state

PinkDuck,
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Doepfer's guide to DIY. From some basics on how to read the schematics to some simple module designs and instructions on how to mod some of their modules
https://www.doepfer.de/DIY/a100_diy.htm

PinkDuck,
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Experimentalists Anonymous DIY Archives. A lot of schematics for various synths and fx
https://experimentalistsanonymous.com/diy/index.php?dir=Schematics

PinkDuck,
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Have you tried building any of these? Bassline looks tempting

PinkDuck,
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Big list of open source eurorack projects and some non-eurorack projects
https://github.com/newdigate/eurorack-awesome

PinkDuck,
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I've checked the BOM and it seems like Bassline has some unobtanium parts in it :( but I'll still try to pull it off when I finish my current projects

PinkDuck,
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Eurorack projects by Skull & Circuits show the schematics they use
https://www.skullandcircuits.com/projects/?v=d3dcf429c679

PinkDuck,
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I'm usually using the one from IK Multimedia Syntronik. It's a little heavy, but sounds nice. I don't think I ever payed for it, they were probably giving it away, or it was bundled with some midi controller, idk

PinkDuck,
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On a free side Venom VB-303 sounds good, but is painful to use

PinkDuck,
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maybe something like littlebits kit? I haven't tried them myself, but they look fun, educational and kids friendly (not sure about 3yo thou)
https://www.youtube.com/watch?v=E7B0mWvnE1Q

PinkDuck,
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Busy week. I've been stuck making a new revision of eurorack module I'm working on, but also found some time to visit a friends studio and refine a mix of a track I'm hoping to release soon. So, some exciting stuff coming soon :)

What's a simplest way to get -5v from +/-12v?

Hi! I'm working on an arduino project that has a -12v/0v/+12 psu. +12 is fed directly into arduinos voltage regulator, so there's also a +5v line available. I need to convert a -5v+5v signal to 0v+5v to feed it into arduinos analogue input and I've already mocked up a schematic in circuitjs based on an opamp that seems to do...

PinkDuck,
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Oops, the schematics didn't attach for some reason, let's try to add it here

PinkDuck,
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thanks! gonna give it a try tomorrow. I'm pretty new to this, and never used opAmps in non-inverting configuration, so I missed this option

PinkDuck,
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it worked! (at least in the sim)
thanks a lot!
I'm not sure I got all the math right, since I get 0 - 5.05V on the output, but it's not a deal breaker for me.
I attached the schematics, but not sure that images in comments federate from kbin to lemmy, so if you don't see it, try opening an original link to this comment.

PinkDuck,
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ah, a little bit of thinking helped me realize that I don't need 1k in inverting loop and then I'll get 5v instead of 5.05v :) and 100k can also be replaced by 1k

PinkDuck,
PinkDuck avatar

No, with 0 Ohm I get a perfect 0+5v sine, just as I need. It's the other way round, it'll amplify the signal and clip off the top at about + supply voltage when you increase the resistance in the feedback loop, but it's not exactly square wave, as the bottom part of sine will remain intact. I use clipping schottky diodes to protect the arduino from voltage outside 0+5v range, this way if you increase input signal to say 20v peak to peak, you'll get more square-ish wave in 0+5v (I've attached the schematics)

PinkDuck,
PinkDuck avatar
  1. it does nothing 😅 I just forgot to remove it from the sim
  2. you mean like power it with 0+5v? I think it won't work with negative input voltages then, right? and I'm using tl074 and I'm not sure that 0+5v is enough juice for it, and I use remaining 3 opamps for other stuff, so it's not really an option for me. the sim didn't have shottky diodes, so this measurements are not 100% accurate, but I used this approach to protect arduino inputs in another project, and it worked well. And yeah, I cranked up the input signal to +/-10v just to check the clipping, it'll normally stay within +/-5v

I already ordered PCB for the prototype. I hope it'll work fine. Thanks a lot for your help :)

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