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

norman phay · Posted: Wed May 07, 2008 6:08 am Post subject:

Boards arrived here today. Loads of thanks, Josh, I'm really looking forward to getting these built up.

The Alison Project · Posted: Wed May 07, 2008 1:35 pm Post subject:

Boards arrived today, thanks again.

Chris

toppobrillo · Posted: Thu May 08, 2008 3:13 pm Post subject:

so i have quite a few PCBs leftover- if anybody wants any, PM me please, i am open to trades for parts or other PCBs even...

if you still haven't sent payment, but are planning to, email me at the yahoo email address please so i can still count your boards as sold-

thanks alot

josh

mono-poly · Posted: Fri May 09, 2008 2:16 am Post subject:

The arived here!

andrewF · Posted: Fri May 09, 2008 3:57 am Post subject:

and boards in the most remote city in the world!
Thanks Josh!

Budgrubber · Joined: Dec 27, 2006 Posts: 72 Location: USA

I got mine! Still working on quad panel design. I have been thinking about trying to match the Buchla panel as much as possible. Is anyone else going down that road?

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

Peake · Posted: Fri May 09, 2008 10:45 am Post subject:

I'll also likely just mimic the Buchla aesthetic and do a separate CV management module.

And I had an idea- Couldn't these boards be set up to be switchable one-shot or cyclic Korg MS20-style LFOs with End Outs and Quadrature? You'd have to use a dual pot controlling contrary motion CV into the A and R control ins to cause it to sweep between down saw, triangle, and up saw. And a CV to do so as well. And global CV for rate...

Just add another CV summer, CV in, and a pot along with a comparator and pop, you get PWM as well.

I can't tell you the fun of dynamically modulating the saw/tri LFO in the Andromeda. It makes filters dance. Always wanted the Korg LFO to be CV'd!

/mr · Posted: Fri May 09, 2008 3:56 pm Post subject:

blue hell · Posted: Fri May 09, 2008 4:05 pm Post subject:

/mr · Posted: Fri May 09, 2008 4:09 pm Post subject:

v-un-v · Posted: Fri May 09, 2008 4:16 pm Post subject:

blue hell · Posted: Fri May 09, 2008 4:18 pm Post subject:

Peake · Posted: Fri May 09, 2008 5:50 pm Post subject:

As was my "Korg LFO" thought. It occured to me afterward as well, that frequency would be tough to tame when shifting the times.

Oh well, we'll just have to restrict ourselves to enyoying one of the best envelopes ever (if not THE best envelope ever, aside from the Wiard).

toppobrillo · Posted: Fri May 09, 2008 6:37 pm Post subject:

i don't believe it would be too difficult to set the FG up like this and maintain relatively constant frequency. an addition of 2 xtra op-amps per FG?

if you match the resistors at the CV inputs, the slopes should respond to CV very nearly symmetrically [three adverbs in a row?? i have had alot of coffee]. the greatest variation in tolerance in this area would of course be in the control pots..

so it would involve subtracting from one input while adding to another, and finding a balance in between. then, you can add an 'overall' input/control to get frequency control. it would work much better if the control inputs were already buffered with an opamp, but i still think it would work ok with minimal interaction between the 2 controls/sources, so long as the output impedance of your control sources were low enough, i.e. if these modifications were a permanent fixture of the module, as opposed to using outside sources with series resistors as large as 1K.

anyways just thinking. it would need to be tested.

i added an overall control to my new module [i may have said that already Rolling Eyes

] which by the way is 4U high as well!

i wonder who's gonna be the first to get one up and running???

josh

Peake · Posted: Fri May 09, 2008 8:02 pm Post subject:

Not me. Parts are in the mail.

Ilanode · Joined: Sep 14, 2007 Posts: 80 Location: Berlin/FRG

Shopping for parts sometimes confuses me: Can MOS 4016 and MOS 4001 chips substitute for CD4016B and CD4001B? And what does mean "use buffered" - stuffing them on the board is not good enough? Sorry, for my newbie querries.

And, yes, the boards look great!

andrewF · Posted: Sun May 11, 2008 8:28 am Post subject:

Hi

Buffered is just a type of cmos chip.
You want to avoid the early A series, but they were phased out a long time ago.
The 'B' stands for buffered.
UB = unbuffered

UB were designed for use in analogue applications - less propagation delay.

Ilanode · Joined: Sep 14, 2007 Posts: 80 Location: Berlin/FRG

Thanks! Those MOS chips make me insecure each time I've to pick one.

neandrewthal · Joined: May 11, 2007 Posts: 672 Location: Canada

Got my boards. Thanks a bunch!

toppobrillo · Posted: Sun May 11, 2008 9:03 pm Post subject:

norman phay · Posted: Mon May 12, 2008 3:04 am Post subject:

Budgrubber · Joined: Dec 27, 2006 Posts: 72 Location: USA

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

slo · Posted: Mon May 12, 2008 5:27 pm Post subject:

Got my board mate, disregard my PM.
Thanks!

George