Instruō - tràigh Design | EPISODE 1

[@andrewjustin174]

Given the push for short form content has been so strong lately this series is awesome!! Long form content is something I’ve wanted to return and this does the trick. A look into the design process which is educational and entertaining. I understand the amount of work that goes into publishing videos of this length is immense and I GREATLY appreciate that you have taken the time to do it. 👍🏻👍🏻

[@clacktronics]

Yes, we don't need T1kt0k everywhere!

[@danieleden1856]

Awesome video, love sitting through the design process to see how you think through each choice! Thanks mate

[@instruo]

Thanks Daniel! I really enjoyed producing this, but definitely questioned myself at points when the length of the footage kept growing 😅 I'm really excited to have the series published now

[@nickolasyounker]

Look forward to this. Winston ❤

[@turbotambourine]

I find editing in glitchy stuff is so fun. But yeah! Maybe one of those things that the maker likes but others don’t as well.

[@instruo]

@@turbotambourine I think I did ultimately take the criticism as a compliment! If it was some goofy aesthetic choices and dislike of the sound track that people talked about most negatively then I’m happy with that! Interest in the project and module was generally very positive ☺️ …I did tone down the glitchy graphics a tad after that though!

[@turbotambourine]

@ that’s a great perspective and you’re so right the interest in the project is the key. I mainly just use it as transitional pieces now.

[@amsynths]

Very nice video and amazing design ideas! Thanks you for sharing. I dont think you need to decouple every op amp on such a small PCB in Eurorack and its analog signals. The op amps are within close range of the power supply decoupling . If it were high speed Op Amps, DAC's and hif-fi audio, yes I would use them. I used to do the same thing but ditched the rule and now use 100nF decoupling where it's needed. Saves space!

[@instruo]

@@amsynths I’m definitely over cautious on the bypass cap inclusion! But when there’s space, I throw them in. ☺️ Can easily DNP the BOM when they go to go to fab. …or forget and then take them off manually!

[@djktana]

I just finisehd to record a video of the Eon's Procyon and i see this one right now :)

[@indigoskywalker]

could you make some of your schematics public so we can see what architecture you are using for vco's for example? are these based on something from the old world like roland, buchla, serge, moog, arp or even curtis.. or are these based on your own ideas never done before?

[@instruo]

The resources are all out there :) The circuit topologies I've used have changed and evolved over the years. My earlier oscillator designs are largely based on Electronotes circuit references, and more recent I use OTA for current control, or SSI2164. The SSI2164 datasheet is an incredible resource in itself. They have actually consolidated lot of resources into their datasheets and design notes. Various implementations of VCA's in the contexts of linear to exponential current control and even temperature compensation methods! It's wild! I work from a mix of datasheets, vintage references and papers as starting points. Nowadays I simulate as much as I can and then lay out prototypes that I can easily modify values on, or use breadboards if I need to (that's not my preferred approach though). I definitely have some circuit designs that I've implemented in recent years that have less of an existing reference behind them. I wouldn't assume they're unique and never before done of course!! But there are some ideas I've tested and refined that ended up doing what I intended... or lead to interesting results that inspired something else! When I started out I just spent all my time trying to recreate things from published vintage schematics. Classic synths had them in their service manuals! Most of the time the opamps detailed are odd/old/obsolete, but they can invariably be swapped for TL074/72 generic ICs. I treated the process the same as learning a musical instrument: transcription, practice, repetition until some sort of understanding took hold. The first oscillators I got to work I had no idea how they worked! I just redrew reference schematics and laid out a PCB.

[@turbochargedfilms]

@@instruo as someone in the "redraw schems lay out PCB have no idea how it works" stage, I very much appreciate this comment and this video as an insight into this world from someone as experienced as yourself!