Making A Sequencer For My Drum Machine Build

[@THISMUSEUMISNOTOBSOLETE]

the mentionned builders livestreams are still available to watch on my patreon, there area few different ideas on them with input from patrons marcnet, antoine on solving a couple of issues on the shift register sequencer but for this build I kept it simple! www.patreon.com/lookmumnocomputer

[@rich1668]

That wall is basically going to become a modular synth 😊

[@CausticCatastrophe]

I love this breakdown of an IC to get to the gritty of the underlying circuit. Really cool!

[@beware_the_moose]

Ben Eater seems a bit lively today! :)

[@willynebula6193]

Lol ill pay that😃

[@wuukaa9079]

Yeah he's our digital electronics god basically 😅

[@sonosus]

This is the best explanation of the CD4013 on KZbin. Finally I understand how it works!

[@jcueni3]

From one nerd to another- the groove box you make is going to be incredible

[@butsukete1806]

That Lego connected breadboard. Mind blown.

[@aksela6912]

I was thinking to myself "this reminds me of a shift register", and lo and behold, Sam was already miles ahead of me.

[@duncan-rmi]

discrete shift registers are much more interesting for sequencers because skip, variable step length, ratchetting....

[@annother3350]

I've got some spare flip flops if anyone's interested but they're in the colours of the Brazilian flag and I had a verruca last year....

[@aksela6912]

Too bad this joke won't work in Australia. They'll never know what they're missing

[@weapea]

Wow! You just build whats near what im planned to do, and you solved the issue with 4017 chips that i had also! Thanks! Now big order for the cd4013 chips you mentioned there..

[@8bitwiz_]

You have 4017 chips? Last month I found a bunch of tubes of chips that I had stashed in the attic a few years ago. I have 29 tubes of the things!

[@autumnbeds]

You're a mad genius

[@eugenezandberg8057]

This approach adds a lot of possibilaties. Could make for a great "pinged" sequencer... I'll will follow this :)

[@DaveCurran]

If you wanted to use the 4017, you could use output 0 as an off state, with no LED or potentiometer connected to that pin. You could then have 9 steps on outputs 1-9.

[@thesynthimuse2790]

Hi. you may already know but at14:00 where you mention about summing the voltages of each stage together, this is the trick that the 'Klee Sequencer' uses. Always enjoy seeing your stuff. I'm old enough to have seen these Everyday & Practical Electronics first time round so it's a fun blast from the past for me.

[@THISMUSEUMISNOTOBSOLETE]

oh I was not aware thats how the Klee worked! thats cool. to be honest I have only seen pictures of the Klee and never played one. cool tho!

[@adamwolters]

Amazing, just when I needed this video, you made it. Thanks so much, I have 4017s flying to me right now.

[@buckstarchaser2376]

Seems like you could make a mini-sequencer that triggers on output from the main sequencer, but it holds the potentiometers for notes, and another for adding/subtracting volts from the previous stinkwincer output, so that you have a selection of notes that plays on schedule, but can change key after some quantity of iterations. It would be just like a real song, though I don't know what makes a real song do those sorts of things. I'm more of an electronics guy.

[@rektagon1547]

first sequencer with the series of flip flop chips reminds me very much of the sequencer on the plumbutter ...

[@THISMUSEUMISNOTOBSOLETE]

who knows it may very well be! it was also said below in the comments the klee sequencer is similar

[@rektagon1547]

@@THISMUSEUMISNOTOBSOLETE yes! I didnt realize what they meant at first until i went and looked up that sequencer. something about the push button to record a bit into the sequencer is a very intuitive way to interact with it. On the Plumbutter you have to manual patch in the reset which can be nice for improvising creating little musical ideas that disappear after they play through.

[@Veptis]

I think I got a little electronics kit on my 11th birthday that has 8 LEDs which light up in order. It must be something similar - and I haven't built it yet. Perhaps I also find a diode to try and troubleshoot rs232 communication with my thermal cameras.

[@fedeboretti]

Wonderfull videoQ how can i learn electronics to do synth stuff and understand why ich component is in there?? some tips to use directly on a music noisy proyect??

[@trevorhaddox6884]

You should have some freindly graphical instructions for the wall displays, it would be attractive and educational for kids.

[@THISMUSEUMISNOTOBSOLETE]

indeed! these will have the magazine articles next to em

[@rupertkingsley]

what do you get the man who has everything? a second modular synth!!

[@maxfrahm8407]

Could you maybe put pictures of the schematics on your website? (For the rythm generator)

[@THISMUSEUMISNOTOBSOLETE]

when i get to the end of a project i usually put a page together, usually before its done the best method is to screenshot them from the videos

[@willynebula6193]

Sam where did you get the Lego pcb's that your breadboards are fixed to?

[@THISMUSEUMISNOTOBSOLETE]

check store page on lookmumnocomputer.com

[@patrickhayden7206]

Whaaat!? No love for the CD4067BE for CV or Gate sequencing? Cool video. :-)

[@mickeythompson9537]

Yes!

[@lucanotreally314]

Could you elaborate? You got me pretty curious

[@patrickhayden7206]

@@lucanotreally314 it's an IC that's like a 16 way switch. They were an easy way to start making 16 step or note sequencers. The through-hole chips were harder to find for a while than the SMD version.

[@patrickhayden7206]

​@@lucanotreally314 They work better than a 4017 Decade Counter, or trying to use two of them to try to approximate a 16 step sequencers. You could always use mux/demux chips, but the 4067 is analog and can make a 16 step sequencer with a smaller chip count.

[@cookedgoose7717]

Hi Sam, dude, check out practical electronics July 1976 cover feature digiscope - that would look cool as a retro display unit. build was featured over 4 months

[@OmeedNOuhadi]

Thanks a lot!

[@gavster89]

I was looking at the NAND gates followed by NOT inverters and thought "there's an AND gate lower down, why use NOT NAND?" I'm guessing that it's to increase the fan out of the sequencer - so if you get issues with your circuit downstream of the flip flop loading the flip flop too much I would suggest putting the logic gates back

[@wuukaa9079]

This is so interesting! Thanks to share your knowledge! :D also yeah I love those pink LEDs! Where did you find them?

[@nrdesign1991]

an M253AA could probably be easily emulated with an Arduino. The hard part is finding all the rhythm patterns.

[@LOOKMUMNOCOMPUTER]

Indeed and the datasheet has the patterns the reason I wanted to do it this way was because Arduino wasn't about back then. And we all myself included default to microcontrollers for this which I'm trying to not do. But yeah m253 is an easy port but like.mentionned in the other vid. With these drum machines the good bits are the sounds the bad but is the preset sequencer hahaha

[@nrdesign1991]

@@LOOKMUMNOCOMPUTER It's awesome the way you do it, because it's *not* the easy way. I'm just thinking about how to preserve the chip's function for future builds

[@rickfrogm825]

I was inadvertently trying to make a flip-flop in excel the other day... (open office calc actually) but its not possible :(

[@PracticalCat]

Hey Sam. A couple of years ago I designed a 16 step analog drum machine. You can program any pattern, select how many steps, change tempo and cancel any of the four instruments. It also has a start stop button. I have not fully built the design yet so its not completely "tested" would you like the schematics so you can build it?

[@LOOKMUMNOCOMPUTER]

Sounds cool! Based on logic?

[@PracticalCat]

@@LOOKMUMNOCOMPUTER Yes! You need to program the patterns with dip switches though :p

[@paulluna8099]

What's with the deal of Jan 1985 ETL, Back to the Future reference?

[@THISMUSEUMISNOTOBSOLETE]

thinki it was something from a magazine to reference canny remember, usually write none personal reminders on my hand but this was a couple of weeks ago so canny remember

[@fnordfnordsson4385]

@@THISMUSEUMISNOTOBSOLETE "ETI" Perhaps? The Jan 1985 issue of Electronics Today International had an article on the Hammond radio museum - seems relevant to your interests :)

[@markdjdeenix6846]

Very interesting!so can the bpm manipulated with a cv ?

[@LOOKMUMNOCOMPUTER]

Yeah if you added CV input to the clock

[@markdjdeenix6846]

@@LOOKMUMNOCOMPUTER very cool 😎 I might have a go and make 1

[@Osc-Mod]

Hello Sam! Long time watcher but this is my first comment! I am playing around with a 74ALS273 and was able to cascade the flipflops, But like you mentioned in the video there is an Issue with a double trigger when the clock goes high then low again. I rewatched trying to figure out your answer for this.

[@Osc-Mod]

...to ramble on some more. I finally did find how u shortened the gate unfortunately the chip that came in my designers kit doesn't have output enable function you explained at kzbin.info/www/bejne/Zp7YimaId99qhsk I did also find a super simple solution for " after the fact" gate to trigger at kzbin.info/www/bejne/gpqzZKN8ir98nck Attach the outputs of the shift reg to a .10uF cap to block the DC and a 1n414b diode to ground to prevent the gate from going neg when the gate input is released. Im going to try it for my case. Im using an old synsonics analog drum machine to test it with.

[@AnalogDude_]

@16m59, would you be so kind and publish the bare schematics made in pdf on your site?

[@THISMUSEUMISNOTOBSOLETE]

yep I havent got that down yet but will do so. realised can do away with the debouncers if I wired it a tad different but will put up a schematic of this stuff up in due course! :)

[@AnalogDude_]

@@THISMUSEUMISNOTOBSOLETE thanks very much ... it's a little more clear that way. did you check out the Turing Machine schematic? i also made a module regarding the CD4013, but more in the high end, using triggers, comparators, but i had to redo one sub pcb, waiting on the mail.

[@dum_travis8034]

im building a small synth that has a similar interface to all the DPDT switches on that enclosure! what do you plan on having the array of inputs control?

[@aksela6912]

It seems to be 8x6, 8 steps and 6 drum voices. Very simple, but probably appropriate for an interactive museum display.

[@dum_travis8034]

@@aksela6912 cool thanks!

[@JonnyDeRico]

a discrete step seqeuncer, ob boy this will get a challange. here I offer my progamming skills (and I have programmed some sequencers) to you man :D

[@THISMUSEUMISNOTOBSOLETE]

thats the next step however the end goal of the flip flop sequencer will be in a couple of weeks its going even one step further than discrete haha

[@JonnyDeRico]

@@THISMUSEUMISNOTOBSOLETE good to hear not that you end up like some ben eater :D

[@thejra-gon6991]

Time to find my breadboards again...

[@willynebula6193]

Yeah i definitely feel the ich.

[@gillywild]

That's a shift register isn't it?

[@davidramirez591]

I think so. If you have 8 F-Fs at each stage you have an 8bit shift register.

[@THISMUSEUMISNOTOBSOLETE]

check from 16:30 onwards

[@zetaconvex1987]

Britain's answer to Ben Eater.

[@6or7breadsticks]

I wear my flipflops on my breadboard

[@u0000-u2x]

Jan 1985 - E+I?

[@d42kn355]

wooo

[@WokeUpScreaming]

Phil 🤣

[@sparkyprojects]

I've sent you an email you might like ;)

[@Gin-toki]

WARNING! Trying to wear CD4013 Flipflops as flipflops, will hurt your feet!

[@beatrizllanosramos8810]

Flip-flop???... Whats is a flip-flop!?...

[@richardburdett7410]

Its awful when a flip flop circuit goes kerflunct