sdiy stuff

i know you guys do this shit. post images n whatever

i guess i have to hold down this fort myself

toasters with jacks'n'knobs

toasters that burn the day's weather forecast into your toast

what good is any of it if it sounds like shit?

uh, what? who said it did?

your mum.

  hahathhat said:

i guess i have to hold down this fort myself

 

Perhaps post a little background here?

Maybe a sample?

I'd post a picture/video of my x0xb0x, but the only thing interesting/different about it is LED #3 never lights up...

  277: 930-933 said:

Perhaps post a little background here?

Maybe a sample?

it's just a little sequencer. in the two videos i posted at the top of the thread, you can see it running a synth i'm working on.

based on the "baby 10" design, though i made it 8 steps due to lack of space in that little box. takes clock/reset in to be driven from a drum machine or such, clock thru, CV out, gate out for each step. runs off a 9 volt.

  Laughable Butane Bob said:

I'd post a picture/video of my x0xb0x, but the only thing interesting/different about it is LED #3 never lights up...

in the very end of the first video i posted, you can see me pick up the thing and drop it because step #5 wasn't firing. the tactic worked

Nice, I really like the idea of having toggle switches like that for your notes.

Can you estimate what it cost?

well here's about what i remember

9x toggle switch @ $1.00 ea == $9

12x jack @ $0.50 ea == $6

8x LED @ $0.50 ea == $4

8x knob @ $0.50 == $4

8x potentiomer @ $1.00 == $8

misc (perfboard, wire, components, etc) = $6

i had the box, just use an old vcr or something

---------

$37 estimate for parts

very simple circuit, most of your time will be in wiring the controls

http://www.midiwall.com/gear/babyseq/pics/wholepage.jpg

here are some other things i have built recently and might post photos of opnce i get them cased up proper:

http://www.musicfromouterspace.com/analogsynth/vcf.html

http://www.musicfromouterspace.com/analogs...RI_SQR_LFO.html

http://www.musicfromouterspace.com/analogs...spinknoise.html

http://home.swipnet.se/cfmd/synths/friends...asm1vco-1.1.pdf

for a per-step delay, you'd have to delay the clock that's triggering the 4017. so what you could do is use a 555/556 IC as a clock, and set it to time delay mode;then you'd only need an extra capacitor and a few more pots, ato set the clock delay per clock cycle. another nice & simple mod would be to add 'glide' by sticking a few caps in there?

yeah, iep is right about adding 555. i'd go a proper glide circuit though

googled and found this http://electro-music.com/forum/post-63796.html

plenty of rambling about them there

awesome thread right there. running stepsequencers at audiorate for complex waveforms is one of analog synthesis' best kept secrets..especially when the step values can be externally modulated. sure, there's all sorts of exotic waveshapers out there, but they lack the surgical precision of 16+ step sequencers - with glide - at audio rate. it is like a visceral, CV version of the waldorf-style 'multiple scanned wavetable' synthesis. i'm gonna pull out a clean breadboard tomorrow and try out some of the stuff they recommend in that thread.

and yeah, having proper glide where you can set the glide 'trajectory' WILL take op-amps (or at least multiple trannies) but that's prolly too involved for a 37$ box!

that sequencer is partially for helping me test/debug shit as i'm putting this synth together, as i didn't have any other handy, portable CV sources. also useful for plenty of other stuff afterwards...

anyways, yeah, i'm already planning a second, more complex one to go into the synth. and it will have glide.

so, if you have any brainwaves, let me know!!

well you might want to look into scott stiles' 'KLEE' sequencer design. i'm buildin a device that's based on his idea of having a step-sequencer that uses a shift-register with multiple active bits in the registers - unlike a normale stepseq that only has a single bit, a single 'active led' in the case of your 4017-sequencer. multiple active bits in a register mean that each step-potentiometer will affect different shifting bit patterns, so that sequences intermodulate. since it is using 16 pots for a 16 bit register, you can have loads of interlocking patterns. then there's pwm for the gate outputs, external inputs for feeding external signals thru an in-built amplitude comparator which can modulate any register entry, bunch of modulation options overall, and lots of other strange shit.

once you get your head wrapped around how it works, it is a nice starting point to build some more specialized sequencers from. heres a nice introduction that explains the workings a bit better klee doc

thread with complete set of original schems and more info

here's schems of the guts, it is based around a 4006/4051 combo; it is relatively complex and expensive (expect to spend 100$ or so and a lot of time fucking around on breadboard) but it is pretty amazing how much this design squeezes out of the components:

bumpity

some good ideas there. the fun thing about building sequencers like that is it's pretty to mix and match chunks of various designs to get exactly what you want...

i just finished a coron DS7 clone

i like it enough that i'm going to build the DS8 sometime soon.

here's a work in progress of the frontpanel i'll be using for the sequencer i was describing. shitty CAD program can't resize properly so text is a bit hard to read. i'll have it done in anodized, engraved aluminium, should be around 150$

bottom part is the sequencer and its controls, topleft is a bank of 12 square/sine utility oscillators, and topright is a module that generates chaotic (semi-periodic) signals when driven with a periodic input signal. should be useful :)

interesting

you done an ee degree?

keep posting stuff

Needs a parts list and step by step instructions for retards who happen to be able to solder such as myself.

  iep said:

here's a work in progress of the frontpanel i'll be using for the sequencer i was describing. shitty CAD program can't resize properly so text is a bit hard to read. i'll have it done in anodized, engraved aluminium, should be around 150$

 

 

bottom part is the sequencer and its controls, topleft is a bank of 12 square/sine utility oscillators, and topright is a module that generates chaotic (semi-periodic) signals when driven with a periodic input signal. should be useful :)

nice! i got a KLEE kit waiting in the drawer. it's waiting for the modular to become finished :)

what's with those 12 oscillators? how are they controlled? what's their purpose?

they're just utility oscillators, generic function generators. for driving the chaos circuits, for example, or for clocking the sequencer, or external gear. this controller will be the center of my setup, it'll also have a Voltage-to-OSC converter (this one http://www.koncon.nl/ipsonlab/) and a patchbay to plug in any arbitrary sensors (whose data will be converted to OSC). so all the functions on it are just utility functions, things i'll need to have anyway. the idea is that it should be open-ended :)

hows the wildcat coming along?

you debugged that Voltage-to-MIDI converter yet? ;)

sounds really good! i find it odd though - you seem to need quite many channels of those oscillators? i understand like 5, but 12! obviously you'll want to clock many modules ;) ... anyways, they're not voltage controlled, right?

so basically... you'll be putting all that signals in the computer, eventually?

wildcat is actually moving forward. after solving the MIDI to CV module problems (it was a faulty/unprogrammed PIC btw), i've finished two VCAs, a glide module (lol, a cap, a resistor and an opamp), an ADSR envelope and the moog ladder VCF. every module so far required additional hacking after finishing :D well, except this VCF, everything's infected by a low buzz since it's been powered on :)

here's a couple of pics of the current mess:

  Quote

wildcat is actually moving forward. after solving the MIDI to CV module problems (it was a faulty/unprogrammed PIC btw), i've finished two VCAs, a glide module (lol, a cap, a resistor and an opamp), an ADSR envelope and the moog ladder VCF. every module so far required additional hacking after finishing :D well, except this VCF, everything's infected by a low buzz since it's been powered on :)

the black art of microcontroller-programming eh. good to hear its up and running now! post some sound if the vco's are done!

  kokoon said:

sounds really good! i find it odd though - you seem to need quite many channels of those oscillators? i understand like 5, but 12! obviously you'll want to clock many modules ;) ... anyways, they're not voltage controlled, right?

 

so basically... you'll be putting all that signals in the computer, eventually?

they're cheap tl072 based osc's, might as well have a lot of them, i can always use some more lfo's :) or maybe create some dense drone-textures with them. they're not voltage controlled but i payed 50$ or so for all of them, i figured it's always nice to have some extra.

it should all go into my computer, basically as a MIDI controller

but there's enough things that can run at audio-rate and make some noise, i'll see how it'll turn out