Eurorack DIY: ADSR Envelope Generator

[@Moonscientistco.575]

thx to open source your tested projects ,look out for your next projects ,Grtz

[@MeeBilt]

Thank you very much, Moonscientist 😊 There will be a steady stream of new projects on the channel (and on my Github of course)

[@Moonscientistco.575]

@@MeeBilt nice, one thing that i miss on your github page ,are, DXF files of your frontpanels, so I can design my own front panel , would be good if you could add this .Grtz

[@MeeBilt]

Great idea, I'll have a look at that!

[@ckngmad1357]

Thank you bro Ur schematic It's easy to understand For noob like me

[@MeeBilt]

You're welcome 😊

[@xposedinneria6646]

Hi! could you give more details on the manufacturing process? e.g. How you do the front plates, what is your workflow with PCB design and ordering, etc. That would be awesome! Thanks!

[@MeeBilt]

Thanks for the comment and your suggestion. I will cover this in a future video, maybe divided into a couple of episodes.

[@vladyslavlibov467]

@@MeeBilt Looking forward!

[@AdamTheAd-vanc3d]

@@MeeBilt Would be greatly appreciated here also 🙏🏾🙏🏾

[@dtharmo]

Well done another one ! This one is also on my TODo list, for its simplicity but efficient side. Feel you so much for reversing the pots! BTW pots legs can be crossed relatively in an easy way with some finger precision, did that a certain number of times...

[@MeeBilt]

Hey HarmO! 😊 Thanks a lot. I reworked one of the first PCBs by cutting traces and adding some wires, but crossing the pot legs is another solution that works fine too. I decided to make another board spin since this is a module that I might want to have a number of in my modular.

[@wdl1908]

Any idea where to get those 1M pods RD901F-40-15K-B1M in Europe? Not from thonk! Mouser only seems to carry the 10k and 100k.

[@MeeBilt]

I buy them from a store in Sweden: www.electrokit.com/en/product/pot-1mohm-lin-rv9312no/ But I strongly suggest that you go for a LOG pot (A1M) instead, since it will make the adjustments so much easier - I have actually replaced the pots on all the modules that I have built... However, these are even harder to find in the EU, so I buy them from Aliexpress.

[@wdl1908]

@@MeeBilt Thank you for the info any links you can share for aliexpress as the only ones I can find have a 10mm spacing between the 3 pins the ground pins not the 7.5mm spacing needed for the boards.

[@MeeBilt]

@@wdl1908 I got these a while ago, the store is named casechan: www.aliexpress.com/item/1005003912965120.html?spm=a2g0o.detail.pcDetailBottomMoreOtherSeller.1.276ckQ9CkQ9CZb&gps-id=pcDetailBottomMoreOtherSeller&scm=1007.40050.354490.0&scm_id=1007.40050.354490.0&scm-url=1007.40050.354490.0&pvid=1b14b8bb-3dc1-4e52-a8d4-1ff577447be3&_t=gps-id:pcDetailBottomMoreOtherSeller,scm-url:1007.40050.354490.0,pvid:1b14b8bb-3dc1-4e52-a8d4-1ff577447be3,tpp_buckets:668%232846%238112%231997&pdp_npi=4%40dis%21USD%213.74%213.55%21%21%213.74%213.55%21%402101c72a17084529995492957e4968%2112000027451259383%21rec%21SE%213730794200%21&utparam-url=scene%3ApcDetailBottomMoreOtherSeller%7Cquery_from%3A

[@davidkeay774]

Hi, do JLCPCB offer an option for the frosted screen over the LED on the front panel?

[@MeeBilt]

It's ordinary FR4 material actually, so it's nothing that you need to order separately.

[@AnalogDude_]

I cloned Befaco VCADSR, that's the very best ADSR out there, made some "minor" improvements and it's very slightly faster than original. It's based on the Serge DUSG / Make Noise Maths. it's very difficult circuit and applause to Befaco. After hours of studying this circuit, i came up with a "new" design, it's a basic ADSR, it takes like 320 nano seconds to change stages and it's unlike any envelop on the globe, but it works. i used CD4000 series and it outputs 10 volts, important for your VCA.

[@MeeBilt]

Awesome, that sounds like a really complex module. At some point I will probably make my own design with more features, but for now René Schmitzs FEITW works fine for me.

[@AnalogDude_]

@@MeeBilt the Befaco VCADSR is complex as is the Serge DUSG / Make Noise Maths, mine ADSR is basic, but does require a expensive chip, at least a bit more expensive than a LM13700N. i could use a cheaper chip, but it's DIP14 and doesn't fit i a 4HP design, so i had to pay more for a DIP8 version. i still use through hole parts. you have to be sure it outputs 10Volts or use a adapted VCA. sure it makes sound, but is it 10Vpp.

[@Chris-qq7mt]

Nice video! Where did you get those quite thin but long knobs?

[@MeeBilt]

Thanks Chris, I bought those on Amazon if I remember correctly.

[@Hennesg]

Where do you order single PCBs and how much do they cost?

[@MeeBilt]

I order sets of 5 PCBs from JLCPCB, they cost around 2€ for 5 pcs + shipping, so it's not a lot of money. There are similar services from other manufacturers, for example PCBWay

[@C0MM0Nbeing]

I cant seem to find your file for this on your github? Did you remove it or is it somewhere hidden?

[@MeeBilt]

It's hidden behind a wierd acronym 😋 github.com/tkilla64/eurorack/tree/main/feitw

[@stefanhansen5882]

What is the total cost of all components uned, including the board and knobs? Thanks!

[@MeeBilt]

The components and PCBs is only a couple of EUR in total, but the 1M Log pots are probably the most expensive parts (If I remember correctly I bought them from Thonk). The knobs cost something like 0.2€ each if you buy the in a pack of 100 pcs (found them on Amazon)

[@stefanhansen5882]

@@MeeBilt So less than €5 in total?

[@MeeBilt]

@@stefanhansen5882 More like 15€; the pots costs 2£ each at Thonk

[@stefanhansen5882]

@@MeeBilt Ah! You first wrote 0.2. Still, 15 isn't much. Thanks!

[@finonomastropiero4261]

Ah kek lmao. I tried to do but it didnt work. Also tried to adapt a led and didnt work . Your schematics seems so much clearer. Thanks bro, you a hero without cape

[@MeeBilt]

Glad I could help! Hope you get it to work. The pots for A,D & R are really sensitive so it's a good idea to use LOG pots instead of LIN. I will do that when I build my next set.

[@boydw1]

@@MeeBilt Apparently you can approximate a LOG response with a linear pot by adding a loading resistor (so long as the drive stage is comfortable with the added load). Might make for an easy adaption to your built module?

[@MeeBilt]

@@boydw1 Thanks, that's a great suggestion. I will look into that!

[@boydw1]

@@MeeBilt I tried to drop a link to where I read about that, but YT seems to have deleted it, so I'll try again (replace SLASH for / and DOT for . ) sound-auDOTcomSLASHpotsDOThtm#chg-law