Hi Kristian, success! And a surprise with cascading. You did amazing work getting the two units into very small boards! That must’ve caused you a few headaches! They’re looking great! I would like to hear them with just a clear sounding oscillator to hear the melody of notes played. You’re far ahead of me, though! A voltage quantizer will be a great addition! Stay healthy and have fun, my friend. Peace
4 года назад+1
Thanks! :) the VCOs I built so far is sooooo unstable though. That is really giving me problems trying to show a thing like this. I have one vco I built years ago (the SASVCO) that is a bit more stable. I’ll try to show with that maybe. :)
Kristian Blåsol ok. Have you worked with the CD4046 VCO chip? I haven’t but I intend to. Also, I would like to invite you to check out my latest video. I finally sat down and breadboarded my own 8-step sequencer, but I used chips other than the CD4017. As I tune it to different things and ‘feed’ it with different oscillator sounds I will post videos of them. As I’m sure you are, I’m very excited to have built a sequencer with actual success, and I’m anxious to show it off. For now, I am using the 40106 chip for the oscillator and LFO. I felt like a girl on Christmas when I finished and it worked! 😃 For some reason, I have viewed step sequencer as the ‘Holy Grail’ circuit time build. I hope you and your family and friends are all staying safe and healthy, my friend.
Excellent, a sequential switch was exactly the module I am planning to build next as well! There is a pretty nice design on Matthias Herrmann's site. Unfortunately it is not suited for switching pitch CV, so I will probably be building my own switches from MOSFETs.
4 года назад
Once you’ve built it share it. ;). I would Love to see your design using mosfets.
I’m pretty certain that with the 4017, the triggering clock sources can ba finnicky. That’s where your 100 pF capacitor comes in, I believe. For some reason, probably the way the rest of my baby 8 sequencers are wired, I have just run an 1n4148 diode from the 8th step pin (¿pin 9?) to our pin 13 for reset. I’ll be interested to get a scope hooked up to see the triggers there between the 8th step and reset, after I cut the diode out and experiment a little with the capacitors! I’m guessing it will lengthen the step to add even the 100pF cap, because of charge / discharge times, but would that be noticeable? There’s a work around for it if so (add more caps to even out the timing). THANKS A LOT, KRISTIAN!! This is just what I’ve been sort of troubleshooting in my eurorack, and here I’ve got my baby 8s all with diodes hardwired to reset after step 8!! Awesome work, and really good to always hear you give good shouts and credits to those who helped you when you needed! I’ve got many of Phobos’ schematics printed out, and it’s a comforting thing to hear about how accessible these electronics gurus are when there’s a question, be it on forums or wherever. We live in a time where we can communicate and really bring everyone in the World together as though we are all living in the same neighborhood! THANKS AGAIN!!
You could also use different clocks, right? Could give an interesting sound, like a variable clock seq. I have to sit and study that schem cause I did a different circiut but I guess it should be almost the same. Also, where did you get those trimpots Kristian? Or how can a search them? +1 for the quantizer!! I think there are some arduino ones
I buy them at lcsc at the same time as I buy pcbs from jlcpcb. It keeps the shipping costs down. And yes! Different clocks would make a really cool melody too. Forgot to show that. Or use the 4031 as a clock source for one. Or a random gate for real chaos. ;) I’ll try to make a video showing a bit more in action.
This is so great! Thank you for the updated schematics. Maybe I'm getting which videos I've seen mixed up, but wasn't there a way to silence particular steps? I don't see those features in this chained version...
When you select a step other than 9 to do the reset, does this keep outputting CV from that step until the other sequencer is done its loop? Do you use a separate VCO for each sequencer in that instance? Also, on the schematic, is "P1 Reset" redundant now, given that P13 also does Reset in?
Hello Kristian! Hope you are well. I will give a much fuller update, but I've managed to mentally exhaust myself building (and rebuilding) the Baby 8. Finally got success with everything up to this cascade option. On one of my first build versions, adding this completely killed the entire device. So, I got everything else going fine but feared adding the cascade. Now I want to add this and have been studying your schematic, as well as all of Phobos'. The thing I can't wrap my head around with your design is connecting Q8 to pin 13 at all times. Doesn't this disable the clock constantly? I noticed Phobos uses switches to decide between cascading (pin 13 connected) and normal (pin 13 grounded). Am I correct with these assumptions about connecting pin 13? I just want to get my ducks in a row before modifying a fine working module, only to have issues again. Thanks as always! Take care.
Hey Kristian, thank you so much for the schematics and the video, in my opinion it´s the most powerful baby8 out there. I would like to build like 4 of these haha Can i ask you for a small advice, maybe i´m just too dense to figure it out on my own, but is this build using only one OPAMP from the TL074 (U3.1)? If yes, can i switch it out for a TL072? Or are all OPAMP´s connected somehow? I´m really sorry if you mentioned it somewhere in the 4 video you made for the baby8 but looking through all 4 schematics you draw i cannot figure that out. Also P3-P10 are also not used or are they?? I think i looked too long at the schematics and my brain doesn´t work correctly haha also i´m a bloody noob when it comes to reading and understanding schematics
Год назад
Sorry for late reply, but yes, seem like you can use any opamp chip which has one or more opamps in it... so a tl071, tl072 would also work... ;)
very cool! do you know of a place to get those trim pots with knobs for a good price?
4 года назад+1
Yeah. I buy most of my components in bulk at lcsc.com nowadays. Good prices and loads of the “normal” components at good prices.
4 года назад
Also ALL components in this sequencer is bought from lcsc. I can really recommend the buttons aswell. Very nice. Although they don’t have any good caps for them. :/
Hey i wonder what to add to use push buttons like the smd just click instead of switches for the reset switches...so one pushbutton pressed at lets say Step 7 and now its a baby 7...? Does it need some kind of logic then like an arduino or rp2040?... guess its a noob question...but anyhoooo
8 месяцев назад
If you mean a momentary switch/push button then yes logic is needed. There are latched buttons in really small form factors. And then you won’t need any logic.
I made this from the schematic and it did not work at all, maybe because I used a regular CD4017 and powered with 12v. It was a really good bit of experience fixing the design as the schematic has multiple errors: Diodes needed from pins 11 and 12 of the CD4081 100k pull down resistors on all CD4081 inputs. There is no way this circuit can work without them. The voltage divider for the comparator op-amp is completely wrong, should be something like 10k/1k not 100k/1k (NO WAY AT ALL THIS CIRCUIT COULD WORK, WILL BE PERMANENTLY SETTING RESET TO HIGH) The op-amp needs powering with GROUND and +12V, not your usual -12v/+12v (NOT MENTIONED AT ALL) I used the 3 spare op-amps to: 1. Boost my beatstep pro's 3.4v clock signal to around 9v so that it would trigger the hi state on the CD4081, 2. buffer the CV outputs before I passed the CV output through a voltage divider (as my logic was all 12V), then finally 3. to buffer the output of the voltage divider to the final CV out (as CV4017 unbuffered as per the original design is not stable across all modules) Along the way I had all sorts of problems with basically every aspect of the functionality, it has completely taken me to another level with regards to troubleshooting and even electronics knowledge. Having said that, why these schematics are posted as though they work I do not know - shitty information and a waste of time. Have a great day.
3 месяца назад+1
Sorry for your misfortunes and that the schematics didn’t work for you. When doing these I was also learning. Although I do believe the schematics worked since that is what the pcb was based on. I am however happy that you learned so much from this experience. Sorry for your wasted time. Also thank you so much for your detailed error checking process. Hope it will help someone else.
I dont see a velocity pot on the diagram, do it have one?
3 года назад+1
Do you mean how “hard” each note is hit? No it doesn’t have that. I guess you could make one by adding a voltage divider on the gate output. That way you could use the gate output to control a vca that is then opened more or less depending on the “velocity” pot/voltage divider. 🤷♂️
@ oh thank you very much for answering my doubts. I see that the clock input is in the 4081... do you think that is possible to connect a 555 with a pot, to the clock input of the 4017 so you can control the speed with that potentiometer? Or it will be more complicated? I want to do this project in cascade cause I want a baby 16, but if it is possible with speed control. Haha thanks again!!
3 года назад+1
Sure. Any digital signal/clock input on the clock input of the 4017 will work to move the chip one step forward.
Great to see those schematics are useful, keep on building!
Nice tip on the capacitor to trigger, have to try tomorrow, tnks again.
I’m here again... soooooo, I will try to stay within community guidelines. Ha ha ha... Kidding Buddy, it’s great to see you back doing it again today!
Hi Kristian, success! And a surprise with cascading. You did amazing work getting the two units into very small boards! That must’ve caused you a few headaches! They’re looking great! I would like to hear them with just a clear sounding oscillator to hear the melody of notes played. You’re far ahead of me, though! A voltage quantizer will be a great addition!
Stay healthy and have fun, my friend. Peace
Thanks! :) the VCOs I built so far is sooooo unstable though. That is really giving me problems trying to show a thing like this. I have one vco I built years ago (the SASVCO) that is a bit more stable. I’ll try to show with that maybe. :)
Kristian Blåsol ok. Have you worked with the CD4046 VCO chip? I haven’t but I intend to.
Also, I would like to invite you to check out my latest video. I finally sat down and breadboarded my own 8-step sequencer, but I used chips other than the CD4017. As I tune it to different things and ‘feed’ it with different oscillator sounds I will post videos of them. As I’m sure you are, I’m very excited to have built a sequencer with actual success, and I’m anxious to show it off. For now, I am using the 40106 chip for the oscillator and LFO. I felt like a girl on Christmas when I finished and it worked! 😃 For some reason, I have viewed step sequencer as the ‘Holy Grail’ circuit time build.
I hope you and your family and friends are all staying safe and healthy, my friend.
Baby Kit or PCB bring it on ! Look like a fun addition to the rack. Keep up the good work man :)
Excellent, a sequential switch was exactly the module I am planning to build next as well! There is a pretty nice design on Matthias Herrmann's site. Unfortunately it is not suited for switching pitch CV, so I will probably be building my own switches from MOSFETs.
Once you’ve built it share it. ;). I would
Love to see your design using mosfets.
I’m pretty certain that with the 4017, the triggering clock sources can ba finnicky. That’s where your 100 pF capacitor comes in, I believe. For some reason, probably the way the rest of my baby 8 sequencers are wired, I have just run an 1n4148 diode from the 8th step pin (¿pin 9?) to our pin 13 for reset. I’ll be interested to get a scope hooked up to see the triggers there between the 8th step and reset, after I cut the diode out and experiment a little with the capacitors! I’m guessing it will lengthen the step to add even the 100pF cap, because of charge / discharge times, but would that be noticeable? There’s a work around for it if so (add more caps to even out the timing). THANKS A LOT, KRISTIAN!! This is just what I’ve been sort of troubleshooting in my eurorack, and here I’ve got my baby 8s all with diodes hardwired to reset after step 8!! Awesome work, and really good to always hear you give good shouts and credits to those who helped you when you needed! I’ve got many of Phobos’ schematics printed out, and it’s a comforting thing to hear about how accessible these electronics gurus are when there’s a question, be it on forums or wherever. We live in a time where we can communicate and really bring everyone in the World together as though we are all living in the same neighborhood! THANKS AGAIN!!
Slowly working my way through this! awesome additions to the regular baby 8, will you add the parts list to the spteadsheet?
so nice, it is helping me a lot, keep it up man
You could also use different clocks, right? Could give an interesting sound, like a variable clock seq.
I have to sit and study that schem cause I did a different circiut but I guess it should be almost the same.
Also, where did you get those trimpots Kristian? Or how can a search them?
+1 for the quantizer!! I think there are some arduino ones
That style of trimpot is sometimes called a cermet potentiometer, searching that on Tayda will find you some!
Thanks!
I buy them at lcsc at the same time as I buy pcbs from jlcpcb. It keeps the shipping costs down.
And yes! Different clocks would make a really cool melody too. Forgot to show that. Or use the 4031 as a clock source for one. Or a random gate for real chaos. ;) I’ll try to make a video showing a bit more in action.
This is so great! Thank you for the updated schematics. Maybe I'm getting which videos I've seen mixed up, but wasn't there a way to silence particular steps? I don't see those features in this chained version...
When you select a step other than 9 to do the reset, does this keep outputting CV from that step until the other sequencer is done its loop? Do you use a separate VCO for each sequencer in that instance?
Also, on the schematic, is "P1 Reset" redundant now, given that P13 also does Reset in?
Hello Kristian! Hope you are well. I will give a much fuller update, but I've managed to mentally exhaust myself building (and rebuilding) the Baby 8. Finally got success with everything up to this cascade option. On one of my first build versions, adding this completely killed the entire device. So, I got everything else going fine but feared adding the cascade. Now I want to add this and have been studying your schematic, as well as all of Phobos'. The thing I can't wrap my head around with your design is connecting Q8 to pin 13 at all times. Doesn't this disable the clock constantly? I noticed Phobos uses switches to decide between cascading (pin 13 connected) and normal (pin 13 grounded). Am I correct with these assumptions about connecting pin 13? I just want to get my ducks in a row before modifying a fine working module, only to have issues again. Thanks as always! Take care.
Thanks Kristian. I have a question - can I use one 10k resistor to ground after all LEDs?
Hey Kristian, thank you so much for the schematics and the video, in my opinion it´s the most powerful baby8 out there. I would like to build like 4 of these haha
Can i ask you for a small advice, maybe i´m just too dense to figure it out on my own, but is this build using only one OPAMP from the TL074 (U3.1)? If yes, can i switch it out for a TL072? Or are all OPAMP´s connected somehow?
I´m really sorry if you mentioned it somewhere in the 4 video you made for the baby8 but looking through all 4 schematics you draw i cannot figure that out. Also P3-P10 are also not used or are they?? I think i looked too long at the schematics and my brain doesn´t work correctly haha also i´m a bloody noob when it comes to reading and understanding schematics
Sorry for late reply, but yes, seem like you can use any opamp chip which has one or more opamps in it... so a tl071, tl072 would also work... ;)
very cool! do you know of a place to get those trim pots with knobs for a good price?
Yeah. I buy most of my components in bulk at lcsc.com nowadays. Good prices and loads of the “normal” components at good prices.
Also ALL components in this sequencer is bought from lcsc. I can really recommend the buttons aswell. Very nice. Although they don’t have any good caps for them. :/
Hey i wonder what to add to use push buttons like the smd just click instead of switches for the reset switches...so one pushbutton pressed at lets say Step 7 and now its a baby 7...? Does it need some kind of logic then like an arduino or rp2040?... guess its a noob question...but anyhoooo
If you mean a momentary switch/push button then yes logic is needed. There are latched buttons in really small form factors. And then you won’t need any logic.
I made this from the schematic and it did not work at all, maybe because I used a regular CD4017 and powered with 12v. It was a really good bit of experience fixing the design as the schematic has multiple errors:
Diodes needed from pins 11 and 12 of the CD4081
100k pull down resistors on all CD4081 inputs. There is no way this circuit can work without them.
The voltage divider for the comparator op-amp is completely wrong, should be something like 10k/1k not 100k/1k (NO WAY AT ALL THIS CIRCUIT COULD WORK, WILL BE PERMANENTLY SETTING RESET TO HIGH)
The op-amp needs powering with GROUND and +12V, not your usual -12v/+12v (NOT MENTIONED AT ALL)
I used the 3 spare op-amps to: 1. Boost my beatstep pro's 3.4v clock signal to around 9v so that it would trigger the hi state on the CD4081, 2. buffer the CV outputs before I passed the CV output through a voltage divider (as my logic was all 12V), then finally 3. to buffer the output of the voltage divider to the final CV out (as CV4017 unbuffered as per the original design is not stable across all modules)
Along the way I had all sorts of problems with basically every aspect of the functionality, it has completely taken me to another level with regards to troubleshooting and even electronics knowledge. Having said that, why these schematics are posted as though they work I do not know - shitty information and a waste of time.
Have a great day.
Sorry for your misfortunes and that the schematics didn’t work for you. When doing these I was also learning. Although I do believe the schematics worked since that is what the pcb was based on. I am however happy that you learned so much from this experience. Sorry for your wasted time.
Also thank you so much for your detailed error checking process. Hope it will help someone else.
I dont see a velocity pot on the diagram, do it have one?
Do you mean how “hard” each note is hit? No it doesn’t have that. I guess you could make one by adding a voltage divider on the gate output. That way you could use the gate output to control a vca that is then opened more or less depending on the “velocity” pot/voltage divider. 🤷♂️
@ thanks, no, i mean how fast or slow the sequence goes. I dont see that potentiometer in the schematics
@@dirtyminds1 ah ok. No this one does not have an internal clock. It uses an external input for that so there is a jack for clock input.
@ oh thank you very much for answering my doubts. I see that the clock input is in the 4081... do you think that is possible to connect a 555 with a pot, to the clock input of the 4017 so you can control the speed with that potentiometer? Or it will be more complicated? I want to do this project in cascade cause I want a baby 16, but if it is possible with speed control. Haha thanks again!!
Sure. Any digital signal/clock input on the clock input of the 4017 will work to move the chip one step forward.