MUFF WIGGLER Forum Index
 FAQ & Terms of UseFAQ & Terms Of Use   Wiggler RadioMW Radio   Muff Wiggler TwitterTwitter   Support the site @ PatreonPatreon 
 SearchSearch   RegisterSign up   Log inLog in 
WIGGLING 'LITE' IN GUEST MODE

buchla 281 clone - put your pcb order in quick.
MUFF WIGGLER Forum Index -> Music Tech DIY Goto page 1, 2  Next [all]
Author buchla 281 clone - put your pcb order in quick.
consumed
http://www.buchla.com/historical/b200/281-funcgenerator.html

this circuit is a 4x AD with VC of both attack and decay (or release).
a clone pcb has been made for it and some initial reports from users are looking good.
EDIT: it is similar to the VCS in its flexibility but it does not track an incoming signal (so it cant be used for slew or envelope following, like the VCS)

so a second PCB run is being made up now.
if you're interested in this (or you think you will get into DIY someday and want to stash these),
then PM "topp" and let him know ASAP.
http://electro-music.com/forum/viewtopic.php?t=23218&start=475

EDIT: the project page:
http://www.sdiy.org/toppobrillo/twoeightyone.html










MrDys
So tempted. I like it because it's basically a VC Doepfer Quad AD (which I can't seem to shut up about) with a trapezoid generator thrown in. Anyone have a sense of the build difficulty on this?

Edit: Oh man, check out the envelope on the bottom. It's settled. I want this thing.

Muff Wiggler
hyper
wetterberg
It's actually a VCAD, which the Quad AD isn't. And it's one AD per board, which I totally friggin' dig. And the range is higher - and since it is VC then it can be used as a VCO even. Me like.

And of course "peake" signed up for four, hehe.

The BOM looks a bit too massive for me to deal with right now. I think I'll pass. :-?

One thing I really like though - he has notes in the docs reg. running it under +-12v, so it could easily fit in a doepfer rig, albeit with some front plate magicck involved. that's pretty rad.
consumed
i added a direct link to the project page in the first post.
im going to pick up four of these and build them in pairs (most likely).
flts
Wonder if I should pick up two boards for myself... So tempting, but I seem to have an endless supply of DIY projects without this already. *Looks at the Wogglebug PCB and parts lying on the workplace, waiting to be put together* lol
plord
OMG SWEET. we're not worthy

All y'all complaining about the unavailability of Banalogue VCS modules? This is that. Or a pair of them is most of a Wiard Envelator, minus the crossfader and plus the Quadrature function, which is different. Um, also plus the Peak function, whatever that is, and minus the inverted and spare positive outputs.

I just put in for 4 of them. Hell yes.
plord
Also, if you have Wogglebug parts lying around, sweet jesus, build yourself those and two of these and you have instant madness.
flts
Hehe, I was planning to build the Wogglebug today already (well, okay, just populate the PCB since I still need to make the panel and get some PCB-mount pots after that so it'll take a while to get it finished) but I basically ended up going through my shelves and throwing and giving tons of useless things away the whole day. Maybe tomorrow... SMD caps scare me a bit, but they aren't as small as I thought.

You have a good point with VCS though, I obviously wasn't thinking clearly and didn't really read carefully what the 281 does. Put in an order for two, it seems there aren't any really rare parts so no biggie.

edit: Building a pair of those would actually solve two problems I have - the lack of VCS availability and the lack of space for a Doepfer quad AD... very frustrating Sometimes I'm so slow I amaze even myself.
wetterberg
but flts, this one *will* be enormous when fitted into a eurorack. It ge like 40HP, hehe.
wetterberg
as an aside, I am looking for a source for these knobs - these have the perfect modern-to-bakelite ratio for me.

flts
wetterberg wrote:
but flts, this one *will* be enormous when fitted into a eurorack. It ge like 40HP, hehe.


I don't think it'll be too huge if I build a dual instead of a quad (PMed an order for two boards earlier). Checking out the PCB measurements and amount of pots, it looks it could fit into something like 16-18 HP, at least if you squeeze it a bit.

We'll see, if worst comes to worst, space is always negotiable if the option is not being able to use cool shit you just built lol
wetterberg
the image above is a dual, not a quad. Turn that about sideways wink At any rate it's killer, should be really useful!
flts
Yeah, I realized it's a dual. Still, I remain hopeful - at least until I have the boards and components in my hand and start measuring and emitting a continuous stream of swear words hihi
Luka
you can get the davis clone knobs at small bear.
the pcbs for this are tiny btw
this is another project in my backlog

canna wait till i get my shipment of components to build
wetterberg
think of it this way: If you make it big enough you can just slap rack ears on it and mount it outside the eurorack w00t
plord
You know what, I have to go check this, but I *think* the Envelator WILL copy the Quadrature function of the 281, you have to do something weird like short the two SQR outs together in cycle mode or something whack like that. I'll play with it and report smile

Still. $12 for boards, a bunch of common parts, and what, a $50 FPD panel and you got a VCS. OR if you're me, a $200 panel and you got a double-wide quad Envelator smile
wetterberg
consumed wrote:
wetterberg wrote:
as an aside, I am looking for a source for these knobs - these have the perfect modern-to-bakelite ratio for me.
http://www.smallbearelec.com/Detail.bok?no=707
Thanks - even the knock-offs are a bit pricey in bulk... I may go with reans instead... hm.
futuresoundsystems
I just PMd Josh for a PCB... hihi
consumed
futuresoundsystems wrote:
I just PMd Josh for a PCB... hihi


cool--but you might want to build them in pairs because of the enhanced functionality (i think you can configure for quadrature).
plord
Yes, absolutely, you want at least two of these smile

I have also confirmed that the Envelator CAN do the Quadrature function of the 281, but you have to patch it up with the included crossfader. Grant spelled out the details in a post to the Wiard list some time ago, here's the detail:

Quote:
OK, one of the original functions of the SQR output on the Envelator was to act as mono-stable for making a gated ADSR envelope. That is if you have two Envelator modules, you can set up one as an ADSR and another as a monstable, this will give you a fixed gate time and allow you to "loop" an ADSR with the end pulse.

The polarity is wrong for using it in quadrature mode, SQR goes high and stays high as long as the Envelator is in the Attack portion of the envelope. For quadrature, you need the inverse.

You can use the cossfader on the bottom as a logic inverter to get the correct polarity. Here is how:

1. Put a dummy plug into the Mix2 input (disconnect Env 2 output)
2. Route a +10 volt signal to the Mix 1 input (a joystick all the way up
will work)
3. Route the Env 1 SQR signal to the Mix Mod input (mixture modulation)
4. Set the MixMod control to max and Mix control to min
5. Route the Mix output to the gate input of Env 2

Now Env 2 will start it's attack phase as soon as Env 1 completes it's attack phase, also called quadrature mode. Route Env 2 END pulse to Env 1 GATE input to make a quadrature LFO.

How does it work? When MixMod is at zero volts, Mix1 is routed to the Mix ouput, and it is at +10 volts. When MixMod is at +10 volts it is routing Mix2 to the Mix output, which is at zero volts - hence an inverter.

If you think about it, the Mix section on the Envelator can be used for logic functions, AND would be MixMod at +10 AND Mix2 at +10, otherwise the output is zero.

The input thresholds of gate inputs on the system are set to +1.5 volts so you can interface to +5 volts systems like Kenton and Roland rhythm boxes. So with the MIX control set to the center, with +10 volts at Mix1 OR Mix2, +5 volts will be output from the MIX output. Because the gate threshold is at +1.5 volts, it will behave like an OR gate.
Kwote
wow. see it's patches like that, that make me realize how shallow my patching knowledge is. i got a ton of experience to rack up.
plord
Me too. I've been working through that tips file I made up, but there can be a dozen uses for each tip, and I'm barely 10% through the list.

Grant does this all the time; posts a short tip that explains and outlines nine new things you never knew were there in the system. It's kind of awe-inspiring? I'm just sayin.
Kwote
fuck yeah it is. with the right knowledge you'll never get it all done.

said it before a thousand times. love this shit! love
consumed
there are many levels of ninja. and nobody knows how deep they go.
MUFF WIGGLER Forum Index -> Music Tech DIY Goto page 1, 2  Next [all]
Page 1 of 2
Powered by phpBB © phpBB Group