/diy/ - Do It Yourself

>>1676921
this is why I'm using MIDI
it's gonna be a digital output from the controller anyway, so it's not like the inputs being analog really matters
that said, mine is going to be an analog
kinda-modular mono synth with digital control, different synths have different needs

also wow noise generators are easy (pic related, a super-simple white noise generator I threw together, will be useful for testing the filter I intend to make soon, and will go into the final synth eventually)

>>1675928
no problem, keep us (probably just me) posted if he gets back to you, I'd love to see your work featured on his channel.

>>1674320
I'll check all the whole thing for continuity. knowing the connectors I'm using a plug probably pushed a socket pin up off the contact side... we'll see when I get home
in the meantime I'm braiding a keychain... because why not?

>>1674283
well I built it to spec, plugged it in (sans panel or jacks) and got intermittent oscillations before it just stopped working

I was working off this deaign from Look Mum No Computer with really no clue what I was doing, and I'm still bot too confident with it yet

there is a chance it still works and I had a loose power connecrion or something, but I'm not quite to a troubleshooting-ready step yet (I'm basically working on an end table in a tiny apartment bedroom, it's hard to work on comfortably for more than 5 minutes)

does anyone have a schematic for a good ±12volt-powered VCO (that tracks 1volt/octave)? the VCO I built appears to have fried itself. All I need is a triangle and square wave, but ideally it would be able to do PWM square, triangle, and sawtooth (and not require a vco chip that costs $15 apiece [looking at you, CEM3340])

any help would be appreciated

I officially have one CV pitch and gate out (it's going to be mono), along with five 0-5v CV outs (4 knobs (half-decent rotary encoders) and the mod slider pad) and another 0-5v CV out that snaps to 2.5v when not actively interacted with (the pitch bend slider pad)
it may be cheap(ish) but this keyboard is perfect for my uses (when paired with the midi reciever (Midimuso 12CV) I bought (which I really need to redo before showing off, it looks terrible right now))

the sticker just came with my oscillator chips, I figured it went well with the rest of the project (as well as any of it goes together, it's semi-intentional patchwork at this point)

>>1670218
is there any way to capture the crt input and convert it to a digital format? because I'd love some hypnotic screensavers :P
(I'm also wondering if it's vector- or raster-based or some combination)

>>1670228
this is where I started, now I'm building my own synth from scratch

Also update: the power supply works and can supply USB power for my keyboard (or charge your phone if you really want it to)

>>1667354
and solder them surface-mount style? now that's just barbaric.
(it's single-sided stripboard, I would rather it be ugly than solder and place components (even wires) on the conductive side)

>>1667252
also resistor chains because it needs resistor values I don't have... it'll work but it ain't pretty

VCO done, minus the adjust pots and patch jacks. hopefully we'll have sound soon (chips will be put in their sockets last)

also yes, I know those patch wires are just beautiful, no need to compliment me (I don't have proper wires for this, so I'm using what essentially amounts to speaker wire for this first board, until I can get proper wire)

>>1666436
alright, IDK why I even have my trip enabled, but that's changing now

coat the pages in resin, binding the whole book together into a solid brick and cut them into bookends (or hammers or something, whatever)

the CV-12 kit I bought is ready, now all I need to do is add the power connector and remote MIDI port, and wait for my keyboard to get here
we should hopefully have first sounds within a week or two

(yes, I know the chips are missing, this is intentional, I'm waiting until I solder the last bits in to put them in the sockets)

>>1664253
also don't mind my resistor clusters, for some I didn't have the right value resistor so I put a few in series that were the right combined value
it really detracts fron the look of it, but it should work the same when it's done

I wish these components would hurry up and get here, I'm waiting on a capacitor and the main chip for my VCO (the CEM3340), plus have 8 more jumpers to solder in

also waiting on my front panel to get here before I start adding the potentiometers

does anyone have any tips on how to mount boards behind a panel? (I have 4" of depth to work with and plenty of 2D space behind, but the only thing I have to mount to is my sheet metal (plain steel, will be painted, probably white or grey) front panel insert (I'm using a nice(ish) decorative MDF box as a case [see above], and I don't want to cut/drill into it)

>>1662206
pots and pot accessories

>>1662741
they had a capacitor bank that could store enough energy to power the city they were in for a good 30 seconds, I think they just overspent (it was a private nonprofit)
I mean seriously I went on a tour there and they vaporised an aluminum plate for fun, these guys weren't cheap

>>1662739
actually nevermind they closed

>>1662736
there's a maker space I could go to (fucking awesome place, they even have tesla coils, a car lift, and a radio tower for fpv drone flights) but they charge a ridiculous membership fee, and it's about 30 miles away

>>1662730
I plan to at some point but don't have the equipment or space for it right now (hell, finding a spot to solder here is a pain)

does anyone know where I can get larger bits of stripboard? the pack I got off amazon was the biggest they had in a 10-pack and they're barely big enough to fit a decent VCO on

>>1661429
this makes so much more sense now, thank you
it looks to me like they're just 2 ports for 1 input, I assume I can get rid of one, right? (getting rid of its potentiometer too of course)

okay, I need a dual VCA setup, and I found this diagram (super simple really, most of the bits there seem to be for power supply noise reduction), but I'm not sure where the 'Level' and 'Envelope' points on the left go to.
I did find this on the right, which tells me all 4 are 100k pots (and not just resistors), but I still don't know where to connect them to.
( http://synth.glitched.org/ built this one, he has a few pics of the board but I can't fill in the pieces from there)

any help you can give would be greatly appreciated