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281 clone project- taking orders now for last run of these..
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interested in a PCB or 4?
yep
98%
 98%  [ 145 ]
nope
1%
 1%  [ 2 ]
Total Votes : 147

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toppobrillo



Joined: Dec 10, 2005
Posts: 766
Location: oakland, ca
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PostPosted: Wed Jan 16, 2008 8:54 pm    Post subject: 281 clone project- taking orders now for last run of these..
Subject description: (voltage controlled A-R/ASR Envelopes with nifty features)
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update 11/22/9

taking orders for 4th and final run of these, PM me with desired qty- PCBs are $12 ea, shipping is generally a flat rate $5 USPS standard, unless you request otherwise.

here is the link to the project information:

http://www.sdiy.org/toppobrillo/

Hello to everyone here- i built a few of these a while back and like them very much-

see here:
http://www.buchla.com/historical/b200/281-funcgenerator.html

the title, i guess, says it- this would be the first PCB i have offered, and as is always requested, any suggestions/questions are welcome. i will post up some scope-shots as they will help to illustrate the "quadrature" and "OR's" functions at work.

the PCBs will be silk-screened and solder masked and a .pdf with all pertinent info will be included. i have tried to make the design as versatile as possible- one generator per board that can be used alone or in conjunction with others-
there are pads for PCB-mount potentiometers, with the Pot bodies spaced
1" center-to-center.

i have modified a few things- but the circuit is very close to the original. the controls, ins and outs are:

attack control with CV input
decay control with CV input
gate/trig input
end-of-cycle pulse output
CV output (0-10V)
3-way mode switch (AR transient, ASR or cycle)
quadrature mode
OR or peak output with attenuator and provision for external input
LED indicator

so this is a poll to gauge interest- i won't take any $$$ until they are produced and shipping- which won't take long, as the prototype PCB already exists (see pic)

the plan is to offer price breaks on sets of 2 or more (remember it is just 1 generator per board), keep the price reasonable, and donate something to electro-music.com Cool these specifics will of course depend on the quantity of boards i can order.

thanks for looking, i am excited to hopefully offer up another cool project for the forum.

josh


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Last edited by toppobrillo on Mon Nov 23, 2009 12:08 am; edited 34 times in total
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goldenechos



Joined: Jun 06, 2007
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PostPosted: Wed Jan 16, 2008 10:08 pm    Post subject: Reply with quote  Mark this post and the followings unread

I see board mounted 16mm Alpha Potentiometers... kick ass! i would def. buy some boards.

Tony
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para



Joined: Oct 16, 2006
Posts: 276

PostPosted: Wed Jan 16, 2008 11:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

great idea, i'd love to see more buchla clones. any idea of pricing yet?


steven
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toppobrillo



Joined: Dec 10, 2005
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PostPosted: Thu Jan 17, 2008 12:05 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
great idea, i'd love to see more buchla clones. any idea of pricing yet?


i think it's still too early- i would like to be able to order at least 50 boards, and offer price breaks for multiples. i would say, preliminarily, that the target would be around an average of $12 a board. thats about a dollar per square inch. hopefully there is enough interest.

josh
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para



Joined: Oct 16, 2006
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PostPosted: Thu Jan 17, 2008 1:44 am    Post subject: Reply with quote  Mark this post and the followings unread

well i'll probably take 4 then, more if the price drops


steven
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6079smith



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PostPosted: Thu Jan 17, 2008 1:46 am    Post subject: Reply with quote  Mark this post and the followings unread

Yes, I'd be interested in a couple of boards...
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Luka



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PostPosted: Thu Jan 17, 2008 2:44 am    Post subject: Reply with quote  Mark this post and the followings unread

sounds good
ill take 4 if it goes ahead

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Last edited by Luka on Thu Jan 17, 2008 4:43 am; edited 1 time in total
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Pehr



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PostPosted: Thu Jan 17, 2008 3:18 am    Post subject: Reply with quote  Mark this post and the followings unread

5 min cycles? Shocked Cool
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toppobrillo



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PostPosted: Thu Jan 17, 2008 3:28 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
5 min cycles?


yessiree, using the control inputs...
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Coriolis



Joined: Apr 11, 2005
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Location: Stilling, Denmark

PostPosted: Thu Jan 17, 2008 3:33 am    Post subject: Reply with quote  Mark this post and the followings unread

Does this thing work sorta like the Serge DSG (VC-AR, VC-Lag gen,VC-LP filter, VC-LFO, etc all-in-one)? Looks to me like it does.

I had a thread going on that subject a while ago, but I'm no designer, so never dared to attempt a clone.

I'd go for 3-4 boards at that price (12$).

Yay!

C
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bugbrand



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PostPosted: Thu Jan 17, 2008 3:38 am    Post subject: Re: Buchla 281 Clone- is there interest in a PCB run?
Subject description: (voltage controlled A-R/ASR Envelopes with nifty features)
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Josh - sounds very cool!

topp wrote:
i have tried to make the design as versatile as possible- one generator per board that can be used alone or in conjunction with others-
there are pads for PCB-mount potentiometers, with the Pot bodies spaced
1" center-to-center.


So, for the true Buchla clone with 4 EGs would you need four boards? (or am I being dumb!?)

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Coriolis



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PostPosted: Thu Jan 17, 2008 3:50 am    Post subject: Reply with quote  Mark this post and the followings unread

Hmmm...any unobtainium in these?
Any funny parts? I guess the VC-elements are vactrols, right?

Edit: Don't see any vactrols on the pic of your prototypes...

C
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Funky40



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PostPosted: Thu Jan 17, 2008 4:31 am    Post subject: Re: Buchla 281 Clone- is there interest in a PCB run?
Subject description: (voltage controlled A-R/ASR Envelopes with nifty features)
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topp wrote:

there are pads for PCB-mount potentiometers, with the Pot bodies spaced
1" center-to-center.

this sounds very good ! good spacing !
i'm definitly in.

some infos about the needed parts would be apreciated. any special ?

Last edited by Funky40 on Thu Jan 17, 2008 5:04 am; edited 1 time in total
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toppobrillo



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PostPosted: Thu Jan 17, 2008 4:40 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
Does this thing work sorta like the Serge DSG (VC-AR, VC-Lag gen,VC-LP filter, VC-LFO, etc all-in-one)? Looks to me like it does.


almost- except that the rise or fall action responds only to a gate- it doesn't decide what to do based on the input signal in the same way. i haven't ever used the serge but i assume it must decide whether the 'input' signal is rising or falling.

is this correct? and respond accordingly. the 281 is like most other envelope generators in that once the cycle is initiated, it rises to the maximum level before the other half can occur.

perhaps combined with a circuit like ken stone's 'slope detector' it could behave more like this.

@bugbrand yeah it's just one FG per board- i could only fit 2 behind a 3W frac panel-amazing that the buchla panel is just another 1.75 high ..

i definitely reccomend using them in doubles at least- you can get some really complicated things going on by staggering the cycles and delaying the triggers to the next set of generators. the quadrature mode basically slaves one generator to another so that it triggers in time you can initiate a finite chain reaction and create multi-stage envelopes that are ever changing.

yowee!


josh
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toppobrillo



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PostPosted: Thu Jan 17, 2008 4:50 am    Post subject: Reply with quote  Mark this post and the followings unread

about the parts, nothing hard to get- no vactrols, just a good old CA3080 maybe the hardest..

josh
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loss1234



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PostPosted: Thu Jan 17, 2008 5:15 am    Post subject: Reply with quote  Mark this post and the followings unread

i am up for one
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PostPosted: Thu Jan 17, 2008 5:22 am    Post subject: Reply with quote  Mark this post and the followings unread

I though the good 'ol envelope had been forgotten- well done for stepping in!

I too will probably be up for a board (or four). Still gotta finish that Soundlab Rolling Eyes Embarassed sigh

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mono-poly



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PostPosted: Thu Jan 17, 2008 6:02 am    Post subject: Reply with quote  Mark this post and the followings unread

Yeah i could use at least four Smile
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fonik



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PostPosted: Thu Jan 17, 2008 6:25 am    Post subject: Reply with quote  Mark this post and the followings unread

two for me, please...
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fluxmonkey



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PostPosted: Thu Jan 17, 2008 7:03 am    Post subject: Reply with quote  Mark this post and the followings unread

4 for me, totally awesome. thanks for sharing!

bbob
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RF



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PostPosted: Thu Jan 17, 2008 7:12 am    Post subject: Reply with quote  Mark this post and the followings unread

I'm in for two!
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Ilanode



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PostPosted: Thu Jan 17, 2008 7:26 am    Post subject: Reply with quote  Mark this post and the followings unread

I'd happily take 4!
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krisp14u



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PostPosted: Thu Jan 17, 2008 8:02 am    Post subject: Reply with quote  Mark this post and the followings unread

im in for 4 maybe more if the price breaks are good
cheers

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3vcos



Joined: Oct 26, 2006
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PostPosted: Thu Jan 17, 2008 8:08 am    Post subject: Reply with quote  Mark this post and the followings unread

Maybe since they are nice to use in at least pairs, you could put 2 on a board. This would bring the cost down and you could replace those 2 pricey 3080's with a 13700.
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Rykhaard



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PostPosted: Thu Jan 17, 2008 8:21 am    Post subject: Reply with quote  Mark this post and the followings unread

I've got some spare 3080's. Wink I'd be in fer 4 of them. Smile Great to see that you're doing this.
I'll put my own multiple looping AD design on hold for the moment. This will more than likely, replace my own design idea. Very Happy
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