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Post by keurslagerkurt on Jan 29, 2021 16:39:51 GMT
Hi all, something else! Over the years I've been trying to learn electronics for audio fx & synth stuff, and this video marks the first time I'm sharing a self-designed circuit! Mostly I've been cloning and adapting stuff, but this one feels a little bit different. Of course I didn't start from complete scratch! Inspiration was taken from a building block in a Buchla waveshaper (from the Buchla 259), which I ended up due to a great video from 'Lantertronics', a great channel for educational audio electronics. The specific video is linked below! The module's design in essence is pretty straightforward and relies of the 'abuse' of a single MCP opamp. With two knobs you can set a 'dead band': eg a band ranging from 1-3V, centered around 2V, which sets all voltages between the 1-3V range to 2V. This way you can shape simple waves, or 'thin out' dense waveshapes. Pretty cool effect if you ask me! CV control is added for the center of the dead band, as well as a CV attenuation knob. Please let me know in a comment if you would be interested in a possible future PCB, a kit, or even a full-blown AE module! If you have design thoughts, inspiration, general remarks or tips, those are all very welcome! Full circuit if you scroll down here a bit: forum.aemodular.com/thread/1188/deadband-filter-design-use-tipsThanks to robertlanger and namke for extra inspiration and tips there! Cya around! x Kurt
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Lugia
Wiki Editors
Ridiculously busy...ish.
Posts: 556
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Post by Lugia on Jan 31, 2021 0:46:00 GMT
Actually, yeah...this WOULD be useful, especially if I read your explanation correctly and it has the ability to mangle CV/mod signals. The Wavefolder is aces for audio wavefolding, but being able to screw around with modulation really hard and under CV would be just...nuts!
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Post by keurslagerkurt on Jan 31, 2021 7:57:45 GMT
Actually, yeah...this WOULD be useful, especially if I read your explanation correctly and it has the ability to mangle CV/mod signals. The Wavefolder is aces for audio wavefolding, but being able to screw around with modulation really hard and under CV would be just...nuts! I have to experiment a bit further, but it should def be useable for non audio signals! (Just some little tweaks from the first design)
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Post by funbun on Feb 1, 2021 14:50:32 GMT
Wouldn't this make for a random LFO?
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Post by keurslagerkurt on Feb 1, 2021 15:29:53 GMT
Wouldn't this make for a random LFO? It would certainly make for weird shapes. I made a pcb prototype with a dc switch for CV manipulation, it should be here in +- two weeks and I'll make a new demo then! (if it works at least, first time i designed a pcb myself) It would not be really random I think: its more like it would 'snap' a certain part of the LFO/env/.. to a voltage of your choice. You could eg say that every voltage between 3.5V and 4.5V is fixed to 4V. This would make your LFO 'jump' sometimes, or place extra 'long' emphasis on certain voltages. Think it could be pretty cool but probably needs some careful tweaking to make it musical!
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Post by lantertronics on Feb 19, 2021 8:23:16 GMT
I'm so glad you found my videos useful! I will have a new and improved version of the deadband lecture posted in a couple of weeks. Of course I didn't start from complete scratch! Inspiration was taken from a building block in a Buchla waveshaper (from the Buchla 259), which I ended up due to a great video from 'Lantertronics', a great channel for educational audio electronics. The specific video is linked below!
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Post by keurslagerkurt on Feb 24, 2021 13:34:43 GMT
Today my first PCB prototypes (a run of five boards) arrived. Only had time to check if the components fit (they do!) and if the board is the right size for 1U AE (it is! Thanks again namke for the easyeda pcb template). But hopefully this weekend I'll have the time to solder it all together and do some more thorough testing & maybe already a demo video!
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Post by MaxRichardson97 on Feb 24, 2021 13:59:43 GMT
Very nice! Can't wait to see the fully finished thing - best of luck with the build!
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Post by pt3r on Feb 24, 2021 15:50:16 GMT
Today my first PCB prototypes (a run of five boards) arrived. Only had time to check if the components fit (they do!) and if the board is the right size for 1U AE (it is! Thanks again namke for the easyeda pcb template). But hopefully this weekend I'll have the time to solder it all together and do some more thorough testing & maybe already a demo video! View AttachmentI would love to hear some more about this process, how , where, price etc... The reason I'm asking; My first iteration of the AEclidian is living on an crammed proto pcb of the diy kit, I guess a custom pcb would make my live much easier and the module much more stable.
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Post by tIB on Feb 24, 2021 21:56:15 GMT
Today my first PCB prototypes (a run of five boards) arrived. Only had time to check if the components fit (they do!) and if the board is the right size for 1U AE (it is! Thanks again namke for the easyeda pcb template). But hopefully this weekend I'll have the time to solder it all together and do some more thorough testing & maybe already a demo video! View AttachmentI would love to hear some more about this process, how , where, price etc... The reason I'm asking; My first iteration of the AEclidian is living on an crammed proto pcb of the diy kit, I guess a custom pcb would make my live much easier and the module much more stable. It would also allow you to sell one to me!
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Post by keurslagerkurt on Feb 25, 2021 12:22:34 GMT
I would love to hear some more about this process, how , where, price etc... The reason I'm asking; My first iteration of the AEclidian is living on an crammed proto pcb of the diy kit, I guess a custom pcb would make my live much easier and the module much more stable. Making the custom pcb was actually easier than expected. It helped a lot that Namke shared his pcb template here on the forum, so all dimensions and such where already in place. Learning the easyEDA software was also not very difficult, a few tutorials and you're ready to go. So this was the workflow once I had the working protoboard prototype: - Pick the components of choice from the easyEDA pcb design tool (in-browser application worked really nice!) - Draw the schematic - Lay out the schematic on a pcb (I found this actually a really fun part, its a jigsaw for adults!) - Send to the manufacturer - Order all components needed So I chose jlcpcb as manufacturer, they are also the company that own EasyEDA (or they just work together?) They are ofcourse China-based, so its not super-ethic, but they manufacture great quality and are very cheap for low amounts too. I paid about 20$ all in for the five boards (2$ for manufacturing, 18$ for shipping haha). I have most components from Tayda Electronics (the small pots, resistors, caps), but their MCP602 IC's seem to be permanently sold out. So I wanted to order the MCP's and some small switches from a local manufacturer. I ended up with TME electronics, as the classic websites (Mouser, RS, farnell) seem to have either gigantic delivery costs, or no option to sell to persons. I paid 0.70 for each MCP602, which is quite 'a lot' compared to other websites, so if I want to make a larger amount of these modules i'll search a different supplier. Feel free to ask anything else ofc if you're interested!
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Post by keurslagerkurt on Feb 25, 2021 16:39:57 GMT
Short test to verify whether it works (it does!): http://instagr.am/p/CLuMEDkhtdJ Now to do some more decent testing with a scope. Noticed some 'minor' pcb mistakes already: - cv pot is connected backwards - inverting the signal was no problem for audio, but ofc it is a problem now when I added cv in option 😅 I will need to swap my configuration to a non-inverting one. - the switch is physically not high enough, i will need another type of a spacer if i want to add a faceplate Ideas to add in next prototype version: - make multiple inputs possible. Input is in an opamp stage, so adding multiple inputs with some resistors might be easy. Would be a cool, small extra feature. - I think I could add a possibility for a vertical dead band (= swapping dead band opamp inputs, maybe with a dpdt switch?) - Do something cool with the last spare opamp on the board (although through-hole space is getting limited..)
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Post by keurslagerkurt on Feb 26, 2021 11:44:41 GMT
In risk of spamming this thread to death: I'm in quarantine right now (but not sick), so doing some further testing in between work Solved the issues I had with the first prototype (at least, I solved them in simulation software), hope to finish an updated schematic and pcb this weekend. Then again, some weeks waiting for the boards to arrive. Also took the time to visually simulate how the module works for CV manipulation, a great idea that was sparked by Lugia on this thread. This is how it looks in its most simple configuration on a triangle LFO: Left is input LFO, right is output. Output is scaleable with a Gain knob. You can also scale the 'length' of the dead band, in this case that is the flat plateau in the middle of the LFO. You can also adjust the vertical position of the plateau, and this position is also controllable with CV input.
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Post by hardworking on Feb 26, 2021 14:59:11 GMT
Wow, as far as I can understand it this seems brilliant! Seems like you can really mess with your sound using this. I'm imagining the same signal being dead-banded on one channel and wavefolded on another...
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Post by keurslagerkurt on Feb 26, 2021 16:29:10 GMT
Wow, as far as I can understand it this seems brilliant! Seems like you can really mess with your sound using this. I'm imagining the same signal being dead-banded on one channel and wavefolded on another... Yay, happy to hear that! I do think this will be in your weelhouse if I recall your nice noise explorations correctly! Lots of 'broken radio' crackles to be found twisting the knobs hopefully the kit will be finished in the upcoming weeks/months (all depends on whether the next prototype pcb's get delivered in 1 week or 2 months, had both in the past already).
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Post by MaxRichardson97 on Feb 26, 2021 16:52:32 GMT
This is sounding really great! Very intrigued by this, more effects are always a good thing!
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Jihel
Full Member
knobs, knobs, and knobs !
Posts: 241
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Post by Jihel on Feb 26, 2021 19:26:07 GMT
I don't know anything about electronics, but I like a lot passionate people.
With these few words I salute your passion and your enthusiasm. Thumb up !
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Post by hardworking on Feb 26, 2021 20:29:35 GMT
Wow, as far as I can understand it this seems brilliant! Seems like you can really mess with your sound using this. I'm imagining the same signal being dead-banded on one channel and wavefolded on another... Yay, happy to hear that! I do think this will be in your weelhouse if I recall your nice noise explorations correctly! Lots of 'broken radio' crackles to be found twisting the knobs  hopefully the kit will be finished in the upcoming weeks/months (all depends on whether the next prototype pcb's get delivered in 1 week or 2 months, had both in the past already). Great! Well definitely let me know when that time comes, I'm sure I'll take a lot off your hands. Crackle crackle...
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Post by keurslagerkurt on Feb 27, 2021 11:46:44 GMT
Aaaaand, we're off for round two Let's hope they are not in customs for a month this time!
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Post by keurslagerkurt on Mar 9, 2021 16:10:38 GMT
Package arrived today!!! Assembly scheduled for tomorrow
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Post by keurslagerkurt on Mar 10, 2021 16:43:55 GMT
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Post by keurslagerkurt on Mar 13, 2021 15:50:18 GMT
First half-decent-but-still-crude demo with sound and explanations! Get to know what you can expect and whether you want this new module in the near future
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Post by NightMachines on Mar 13, 2021 16:16:11 GMT
Good to see the PCBs! Seems like a very easy DIY build
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Post by moruial on Mar 13, 2021 17:44:39 GMT
Look promising!
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Post by slowscape on Mar 15, 2021 16:07:04 GMT
I'm all about timbre, seriously looking forward to this!
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