TomTomTom Twin-T filter Drums - DIY Modular in a Week 9.2

[@arenotdiy]

I really like that you show where you get your circuits, it demystifies the process a bit, and makes you much more relatable. Love the videos! I'll Support you when I have money lol

[@pbartmess]

These drums really sound good! Your rack is really coming together, especially with the addition of those logic circuits.

[@HeegeMcGee]

I don't know much about modular synths, but have been REALLY digging your videos as i try to learn about building one. Thanks so much for the work you've done to share the knowledge with us!!!

Thanks you for watching. Hope you make a modular. And when you do show me/us! :)

[@johnhardig9754]

This is a great episode Kristian! This looks nice and simple. I'm going to build this one on my MIAW PROTO board.

It’s a good easy build to start with. Even though the “loop” circuitry confused me a few times. ;)

[@chent]

Super awesome, I've been looking for more info on this stuff for some time now

[@kurtkabica]

Thank you Kristian. For hard work and sharing your experiences,, Eric Archer has shared some really elegant drum circuits in his andromeda space rockers series they were kits ,and he shared the design, I have built them sound great low part counts Also I like allelectronics . In USA think they ship to Europe cheap but limited stock,, great service. Thanks again

[@QuincasMoreira]

awesome!

Thank you Quincas!

[@QuincasMoreira]

@ I just got your new boards by the way! They will be put to good use :)

[@lonelyromannoise8806]

I've really been enjoying this drum series lately. Well, I've enjoyed all your videos, but self-contained drum modules seem have the most instant gratification of any modules I've looked at. Maybe you could do an episode or appendix on a simple finger-drumming performance module, with some tac switches wired to a V+ and a gate-to-trigger converter for playing the modular drumset. It might be too simple for an episode by itself but they're very fun to play with, now that you've got a growing collection of drums.

Definetely, I have a "day" coming up with just different inputs, and this was one of the thoughts I had, so it will come, even though a lot of episodes ahead, LOTS of drums to do first ;) Thank you for suggesting ideas!

[@Sarahbuildsstepsequencers]

Great job on this, Kristian! I need to get to this! Elliott is a big help. Also, if you haven’t seen the 3-part series on Casper Electronics elsewhere on KZbin, there MIGHT be something useful for you there as well, but, I think you may have already gone past most of the lessons he teaches there. Worth a look to find out, perhaps.

[@Helmut314]

Looks and sounds great, Kristian. I am tinkering with a stripboard layout as I write this and I did notice an inconsistency in your schematic, the opamp named U5.2 has inverting and noninverting inputs switched. Keep up the good sounds 😉

[@paulfranklin5360]

Peter Svedman I prefer stripboard if you don’t mind sharing your layout 😊

[@Helmut314]

@@paulfranklin5360 Sure thing, Im fiddling around with it and its still in DaveCAD™ 😁. Once its verified this weekend I will post it if Kristian is ok with that.

Ofcourse I am ok with that! :) And thank you so much for finding the error in my schematics... Weird part in the program which switched the placement of the pins which confused me. I have fixed it now, so make sure to use schematics v1.1 instead. Let me know when you make the layout and maybe we can share it with more people?

[@woosix7735]

Can you get away with a diode and pull down resistor after the input capacitor to solve the rising and falling edge problem?

[@Culfeldt]

Is this supposed to be running on 12v? It sort of works for me on 5v, but I only get clicks on 12v.

[@SouthShoreSonics]

Works great at +5V too! Funny that the 4069 works as a Twin T but subbing a 40106 will not.

[@miklos7503]

Just built it, sounds great. Seems like it's very picky about the 220nf cap, my breadboarded attempt worked better with 2 100nf caps in parallel but the soldered version on perfboard preferred the 220nf. So kind of a frustrating build before I figured that out, ha. Fits right in with my tiny dazzler snare/hi-hat and 808 clone builds. I'm curious to see what other drum modules you have up your sleeve. Thanks for your hard work!

Interesting find. I’ve looked at the tiny dazzler circuits. Do they work well? If you have please share where you found the schematics. I also looked at 808 sounds of course. :)

[@miklos7503]

@ Tried to link a sound sample and schematic link but I guess youtube flags comments with links as spam? If you search for "tiny dazzler" on google images the schematic from electro-music pops up, that's the one I used. The snare sound is kinda "squishy" for my liking but you really can't go wrong with trying it out considering how simple and fun they can be.

[@kristianblasolsramblings6274]

Nic Csonka unfortunately all his schematics were hosted on tinypic which ceased their service last week. :( so all the schematics are gone. So if you have them lying around I’d love to have a copy. I’ll look in my spam comments.

Seems tinypic service was shut down where all his schematics were. So I have emailed him hope he returns with the schematics. 🤔 2 100nf should actually be better according to Elliot Williams. As it is more accurately 2x the values of the other two caps. :)

[@miklos7503]

@ Interesting, yeah I noticed if that capacitor value wasn't spot on it still sounded like a decent bass drum but you'd lose the nice higher pitched tom tone. I can send you the schematic of the dazzler, use the info at sorcerystudio one?

[@gabrieldai88]

hi kristian. none of the capacitors are electrolitc?

[@davidmurphy2211]

Kristian, Thank you for this series. I love the pace of your videos. Have you mentioned your new patch cables in another video? Do you still recommend the 100 for $50 from AliExpress? I’ve just started on the MiaW journey, and am going to have to spring for patch cables very soon.

Thanks! Do you mean the yellow ones? Those are the older ones that I haven’t used because they were too short. Well... I’m getting to the point where I would like my cables to be a bit more stiff. That would probably be the biggest caveat for the cheap aliexpress ones. As for quality I have only had one fail on me so far. So not really a problem. I might buy a few connectors to make a few of them shorter too.

[@davidmurphy2211]

Kristian Blåsol Yes, I didn’t realize the yellow ones were older. I think the AliExpress price went up a bit ($60 if I recall), which still is the best price per cable. I was trying to find a decent amount of cables in the $20-30 range but I can only find the ones targeted for modular synths that you only get 8 - 10 cables.

A guy in a forum I’m active in started synthcables.com. I think he is based in Europe and makes and sells “real” patch cables a bit cheaper. 12£ for 6. Still not even close to the aliexpress ones but.... 😅

[@spot2028]

Just wondering, what happened to episode 9.1? :)

That’s the BasNaHi... it was released a bit early to have some drums to play with the clock divider. :)

[@spot2028]

@ ah, got it. Thank you!

[@tinfoilcat]

Neat-o! I should get to making some drum circuits.. I played around with the Audio artist on breadboard, basically a Twin-T that gets pulsed by one oscillator and gets it's cutoff modulated by another. For modular use you could skip the clock and just keep the good stuff! I remember doing some mod to it making it sound even wierder. Have a look: www.synthdiy.com/show/?id=1654 It uses diodes to get rid of the negative pulse. I did a simpler solution by adding a reversed diode to ground after my cap, thus avoiding any voltage drop and still getting rid of most of it. My circuit did not care about the tiny negative that remained.