281 clone project- taking orders now for last run of these..

ericcoleridge · Joined: Jan 16, 2007 Posts: 889 Location: NYC

Josh,

Great news! I'm really looking forward to this project. Thank you for making it possible

Also:

Luka · Joined: Jun 29, 2007 Posts: 1003 Location: Melb.

my interp of the buchla design was that the pots generate the OR and the switches allow quad' of the 2 pairs

toppobrillo · Posted: Thu Apr 03, 2008 10:10 pm Post subject:

Sound · Joined: Jun 06, 2006 Posts: 842 Audio files: 1

A 16U Eurorack idea Smile

Edited because error. See below.

Coriolis · Joined: Apr 11, 2005 Posts: 616 Location: Stilling, Denmark

Great news!

But errmm...do I have to figure out all of those extra paypal charges or do you just calculate the total for me?

C

toppobrillo · Posted: Fri Apr 04, 2008 3:31 am Post subject:

toppobrillo · Posted: Fri Apr 04, 2008 3:38 am Post subject:

here look at these

281 panels.JPG

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Coriolis · Joined: Apr 11, 2005 Posts: 616 Location: Stilling, Denmark

Those are lurvlee Josh! I've adapted that layout to my own panel format (also using banana jacks). I think the way you've arranged it makes a lot of sense.

Btw: will the documentation explain the necessary connections between the two boards? If I've understood correctly, part of the circuitry that links these two 281's will be off-board?

C

toppobrillo · Posted: Fri Apr 04, 2008 4:08 am Post subject:

hey thanks! yeah i will have a couple wiring diagrams too.

Sound · Joined: Jun 06, 2006 Posts: 842 Audio files: 1

Sound · Joined: Jun 06, 2006 Posts: 842 Audio files: 1

Hi topp,

In your front panel, "Peak out" is, I think "OR sustain", but what is "Peak in"?

fonik · Posted: Fri Apr 04, 2008 5:02 am Post subject:

as i understood the function generator this is just a gate/trigger in. you may want to call it peak in just because you may retrigger the generator with the peak out. am i right here?

Sound · Joined: Jun 06, 2006 Posts: 842 Audio files: 1

Fonik, don't understand... also these input tnere are not in the original Buchla design...

It is my corrected 16U Eurorack suggestion:

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

/mr · Last edited by /mr on Sat Apr 05, 2008 3:17 am; edited 1 time in total

Latecomer looking for 4 boards!

Hi all,

I found this thread today, I always wanted to clone the Buchla 281 but to my great horror I realize that I'm probably way too late to get any of these nice boards. Crying or Very sad

But if anybody out there is having regular nightmares after having ordered too many (or if Josh ends up with additional ones) please PM me - as I'd be more than happy to take care of them! Btw, I'm looking for 4 boards.

Thanks,
good luck with the soldering and happy triggering everybody. Smile

toppobrillo · Posted: Fri Apr 04, 2008 2:23 pm Post subject:

toppobrillo · Posted: Fri Apr 04, 2008 3:24 pm Post subject:

so i am getting alot of confirmations and a few things have come up:

1. do not send me money yet. for one thing, the boards are not here yet. for another, the yahoo email i provided in the PM is not associated with my paypal account, i set it up specifically to handle support issues with this project. i will send an official invoice from my paypal email address when it is time to pay, with the total.

2. 8$ US does not include shipping. i have to buy a big pack of padded envelopes, print shipping labels [this is one reason i asked for your shipping addresses] and i'm not sure how much that will be yet. domestic mail will be a flat rate, but i will have to price some international orders on a case-by-case basis.

3. if you can pay by US funds, then i don't get charged a currency conversion fee. so by all means, save a buck or two if you can. i hope it is made clear that the paypal charge[s] will be added to your totals.

thanks alot!

josh

Sound · Joined: Jun 06, 2006 Posts: 842 Audio files: 1

Sound · Joined: Jun 06, 2006 Posts: 842 Audio files: 1

Topp, about the payments its same easy to me, and I think for all us, pay on us dollar that pay in euro. It is a lot of work to you. Do not work so much trying to be too fair.

Every one know that you have a lot of work, so. make it easy. If say 9 or 10 or 11 US dollar cover aproxematly or more your paypal taxes it is Ok.

Go ahead and many many thanks!

toppobrillo · Posted: Fri Apr 04, 2008 4:44 pm Post subject:

hey, so you mean if you [the international buyer] chooses "US Dollars" that you will pay that difference and i wouldn't get that charge? excuse my ignorance, paypal is still pretty new to me.

have a look at Yves' minimum/maximum module here:

http://yusynth.net/Modular/EN/MINMAX/index.html

the 'peak' section works like the maximum, the 'peak in' is just one more input- the others being the 2 functions of course

Sound · Joined: Jun 06, 2006 Posts: 842 Audio files: 1

well, I only know that when I pay I can choose the devise( euro, dollar, etc...)

And you receive it in Us dollar. But I have used Paypal as a customer , not as a saler.

maybe fonik or Tim servo know exactly about that.

I'll take a look to the link. Thanks.

Peake · Posted: Sat Apr 05, 2008 11:59 am Post subject:

I'm in because Topp phoned Don and got approval. Kudos!!!

I wanted to bring something up before people complete their front panels. The slopes of this envelope are linear (scope shots). Grant Richter, in explaining the 281 and his own excellent Envelator, tells of feeding back some of the output CV to the time inputs, in order to continuously modify the slopes from linear through exponential through logarithmic, depending upon the voltage (positive provides one, negative the other, both in increasing depth).

Does Grenader still sell his miniPCB that provides a center-detented inverting attenuator, ala' the Serge and some Buchla modules? I can see having one for each envelope stage.

I'm a nut for keyboard tracking of envelope time, so it looks like I'll have to wire up some CV summing circuits...and something to allow for variable velocity control amount.

Just some thoughts on an aspect that I haven't heard discussed herein. Thanks again Topp, I'm looking forward to it.

/mr · Posted: Sat Apr 05, 2008 5:14 pm Post subject:

Peake · Posted: Sat Apr 05, 2008 5:36 pm Post subject:

Don Buchla is the man, and he left off attenuators...his 281 layout is excellent, as are his other modules, so you have to give him credit where credit is due. A bunch of attenuators would so clutter a panel that it would be nigh unusuable (unless someone can prove me wrong). I'm seeking additional panels or panel space dedicated to CV manipulation, as that is the module's strong point. VC LFO, VC envelope, VC quadrature LFO, VC gate delay, etc.

Once you've played with continuously variable envelope slopes, you won't want to go back Very Happy

Luka · Joined: Jun 29, 2007 Posts: 1003 Location: Melb.

buchla 200e has a attenuation matrix module for audio and control

toppobrillo · Posted: Sat Apr 05, 2008 9:02 pm Post subject:

about the input attenuators, i personally don't see them as a necessity for this type of circuit [a controller itself].

you can add them of course, but be aware that the input circuit wasn't designed for this and is hence not buffered as in, say, a VCO. the consequence is that the [grounded] input attenuator will likely have some effect [not much] on it's respective slope when the CV input is not being used.

you may have to change a few resistor values in the input circuit if this annoys you. i guess it wouldn't be too big a deal, as if you are messing with the attenuator knob, you probably have something plugged into the CV jack anyway.

i think of the CV inputs in this circuit as facilitating a more or less 'programmable' envelope [according to synthesizer programming techniques of the early 70's Laughing

] for example, ganging all CV inputs together in a 281 module lends itself to applications in polyphony where a user might want to play 4 duplicate voices...

this isn't to say, though, that dynamic [vs. static] control of the slopes isn't
super useful as well. it's just that the attenuator knob here might not be something one reaches for while playing nearly as much as with other types of modules.

there are lots of modifications that come to mind with these generators. it will be really interesting to see how people build them!