The drums board you can find here: www.circuitbenders.co.uk/forsale/CB55/CB55.html Code for the Arduino, mods and the schematics for the bass synth I'll put on my website sometime the coming week: www.evilturtle.nl/projects.html
On your page, I have quick question, regarding the LM324 op amp / comparator. You’ve listed a DIY vactrol with a 5-50k value listed there. I understand the Vactrol is an LED packed up tight against an LDR, but how should I meter for this 5-50k value, is it read on a multimeter for resistance? And across which legs of the Vactrol? Thanks for any help with that, I think it would help a lot. The triggering sequencer from Arduino is a great little project, as there are many more PCBs like the CB55, and so your project could very likely be implemented (as-is without modification) is to drive say, the Hexinverter.net Ate-Oh-Ate toms, etc. THANKS FOR SHARING, GREAT WORK!!
The 5-50k resistance range is for the LDR, from what I recall the LDR should be in that range when the LED is on. If not, you only have to change the 10k resistor in that circuit to match, so it's not a big deal if yours isn't in that range :) If you have a premade vactrol, then it's best to look up the datasheet, those always have the pinout. The type number is always printed onto the casing for easy searching. Glad you like it, thanks
@@rot_studios This is absolutely phenomenal. You give me a reason to revisit a lot of books and courses. I'm a maniac of Juno 60, Oberheim DX/DMX and LinnDrum machines. However, their prices escalated so much that probably, due to economical reasons and practicality, I'll never purchase them 🙃. Since 2 years I've started to feel anxious about one single thought that I've had. If in 1980 Roger Linn was able to construct the LinnDrum then what's truly stopping me from making one? Schematics are widely available, some key components either are still mass produced or they have their equivalents. Isn't the lockdown period a perfect moment to learn more about it? 🙂
Added a very simple "overdrive" mod to the kick that gives it so much punch, essentially just a resistor replacement by a variable one so the output transistor goes into overdrive. :D I also fixed the drums VU meter, it had a little derp :P
@@rot_studios , oh may i ask one more technical question, since you have been doing that: where to look about what are technical parameters for trigger outputs? Is there even "industry standart" for that? I mean voltage, polarity, impulse length? I would much appreciate info on this, Thankyou. EDIT: my reading around says it should be basically impulse of 5V. Right? :)
Hello, may I ask, provided code - is it for Arduino Uno, or Mega? Thank You... Would be nice some primitive (hand drawn, anything) Arduino connections diagram, or if no time for that - maybe just table: Pins - Connections (Pots, outputs, etc). Thank You in advance! :)
@@rot_studios , Oh, I am sooo glad AND Thankful you responded on this! :) So, as I see it, change of beat patterns are done with analog pot, similar as in arduino "minipops" drums? And, about DIY opto-resistances. Did you buy some particular items for LDR, or just adapted what you "found in drawer"? :)) Again - thank you! Btw, I think bass lines sounds pretty good!
As a commission could you "fix" the akai rhythm wolf so it's actually possible to permanently tune/caliber the bass engine and to improve the drum sounds?
Well looks like it is fully analogue so modding it is definitely possible (beware that opening it up voids the warranty!). What are you looking for exactly though? Longer/shorter decays, tuning etc? Unfortunately AKAI hasn't released service manuals or schematics (and they really should), so all this would be very much up to experimentation.
Zou kunnen, maar zo te zien moet je dan wel een arduino + digitale potmeters (ipv draaiknoppen) gebruiken voor het aansturen. Voordeel is dan wel dat je dingen kan doen als patches/presets opslaan etc Alternatief is dat je dat ding helemaal ombouwd met draaiknoppen, maar wellicht is het beter een goedkoop mengpaneeltje te vinden dan :P
Mixers are great for synth building, because of the knobs but also loads of op amps, capacitors, transistors all made for audio. Great way to build synths for cheap and to recycle!
Wow you are a friggin WIZARD! This is incredible. Great work!
Dammit, now I need to buy a wizard's hat D:
nice job bro.
@@baddriddimworkshop thanks
That sounds great !
It's a great circuit, can definitely recommend it :)
I would like one!
The drums board you can find here: www.circuitbenders.co.uk/forsale/CB55/CB55.html
Code for the Arduino, mods and the schematics for the bass synth I'll put on my website sometime the coming week: www.evilturtle.nl/projects.html
Thanks!
New page is in the making, with info code and schematics: www.evilturtle.nl/projects/blueclone.html
On your page, I have quick question, regarding the LM324 op amp / comparator. You’ve listed a DIY vactrol with a 5-50k value listed there. I understand the Vactrol is an LED packed up tight against an LDR, but how should I meter for this 5-50k value, is it read on a multimeter for resistance? And across which legs of the Vactrol? Thanks for any help with that, I think it would help a lot. The triggering sequencer from Arduino is a great little project, as there are many more PCBs like the CB55, and so your project could very likely be implemented (as-is without modification) is to drive say, the Hexinverter.net Ate-Oh-Ate toms, etc. THANKS FOR SHARING, GREAT WORK!!
The 5-50k resistance range is for the LDR, from what I recall the LDR should be in that range when the LED is on. If not, you only have to change the 10k resistor in that circuit to match, so it's not a big deal if yours isn't in that range :)
If you have a premade vactrol, then it's best to look up the datasheet, those always have the pinout. The type number is always printed onto the casing for easy searching.
Glad you like it, thanks
tolle maschine!
Danke schon! :)
Danke!
Hi mate. Amazing work. Did you study electrical engineering?
Thanks! Nah, I'm just self-taught :)
@@rot_studios This is absolutely phenomenal. You give me a reason to revisit a lot of books and courses. I'm a maniac of Juno 60, Oberheim DX/DMX and LinnDrum machines. However, their prices escalated so much that probably, due to economical reasons and practicality, I'll never purchase them 🙃. Since 2 years I've started to feel anxious about one single thought that I've had. If in 1980 Roger Linn was able to construct the LinnDrum then what's truly stopping me from making one? Schematics are widely available, some key components either are still mass produced or they have their equivalents. Isn't the lockdown period a perfect moment to learn more about it? 🙂
@@danielfaraday8197 Basically why I got into synth DIY: no funds to burn on existing products, so I make my own!
Added a very simple "overdrive" mod to the kick that gives it so much punch, essentially just a resistor replacement by a variable one so the output transistor goes into overdrive. :D
I also fixed the drums VU meter, it had a little derp :P
It's the BOSS DR-55, not Roland though the sounds are very similar to some Roland drum machines :)
What are you using here to sequencing bass line? Thanks
I preprogrammed a bunch of melodies into it. Later I also added MIDI for external sequencing.
@@rot_studios , oh may i ask one more technical question, since you have been doing that: where to look about what are technical parameters for trigger outputs? Is there even "industry standart" for that? I mean voltage, polarity, impulse length? I would much appreciate info on this, Thankyou.
EDIT: my reading around says it should be basically impulse of 5V. Right? :)
Hello, may I ask, provided code - is it for Arduino Uno, or Mega? Thank You...
Would be nice some primitive (hand drawn, anything) Arduino connections diagram, or if no time for that - maybe just table: Pins - Connections (Pots, outputs, etc). Thank You in advance! :)
Arduino Uno. The connections are all defined at the top bit of the code, but I'll add them here for clarity's sake:
//bass synth
#define BASS_CLOCK 8 //PORTB 0
#define VAC_PWM 9
#define VAC_CUTOFF 10
#define PWM_OUT 11 //PORTB 3
#define SAW_OUT 12 //PORTB 4
#define MIDI_ACTIVE 13
//controls
#define ATTACK A5
#define DECAY A4
#define WAVE A3
//drum triggers
#define TRIG_KICK 3
#define TRIG_SNR 4
#define TRIG_HH 5
#define TRIG_RIM 6
#define TRIG_ACC 2
//controls
#define MIDIEXT 7
#define TEMPO A2
#define BEAT A0
#define STST A1
@@rot_studios , Oh, I am sooo glad AND Thankful you responded on this! :) So, as I see it, change of beat patterns are done with analog pot, similar as in arduino "minipops" drums? And, about DIY opto-resistances. Did you buy some particular items for LDR, or just adapted what you "found in drawer"? :)) Again - thank you! Btw, I think bass lines sounds pretty good!
As a commission could you "fix" the akai rhythm wolf so it's actually possible to permanently tune/caliber the bass engine and to improve the drum sounds?
Well looks like it is fully analogue so modding it is definitely possible (beware that opening it up voids the warranty!). What are you looking for exactly though? Longer/shorter decays, tuning etc?
Unfortunately AKAI hasn't released service manuals or schematics (and they really should), so all this would be very much up to experimentation.
could i turn a zoom rhythmtrak 234 into something minimal like this?
je woont in nederland. ik vind dit echt te vet
Zou kunnen, maar zo te zien moet je dan wel een arduino + digitale potmeters (ipv draaiknoppen) gebruiken voor het aansturen. Voordeel is dan wel dat je dingen kan doen als patches/presets opslaan etc
Alternatief is dat je dat ding helemaal ombouwd met draaiknoppen, maar wellicht is het beter een goedkoop mengpaneeltje te vinden dan :P
@@rot_studios denk je dat ik er individual outputs uit kan trekken? hij heeft nu gwn een een phones en L&R
looks like an old mixer panel
It is, from an old Inkel 800 mixer. It has these fancy wood side panels, perfect :D
I have a few old mixer boxes, that I could probably do that to
Mixers are great for synth building, because of the knobs but also loads of op amps, capacitors, transistors all made for audio. Great way to build synths for cheap and to recycle!