Electro-Music Klee Sequencer Build and Applications Thread

EdisonRex · Posted: Mon Sep 24, 2007 7:41 am Post subject:

Those plastic toggles were quite good, actually. Ingenious, in fact. Beat the crap out of those little bat switches.

I think that colour scheme, either one would be radical.

Randaleem · Joined: May 17, 2007 Posts: 456 Location: Northern CA, USA

clickmrmike · Posted: Mon Sep 24, 2007 8:27 am Post subject: 0.1% resistors?

Anyone have a source for 0.1% resistors (through hole) stateside? The only place I can find is Mouser; and I'm not thrilled about paying US$1.37 each for them for the 20 needed in the Klee.

click!

Randaleem · Joined: May 17, 2007 Posts: 456 Location: Northern CA, USA

Scott Stites · Posted: Mon Sep 24, 2007 12:53 pm Post subject:

I matched the ones on the breadboard. Bill sent me some 0.1%'s that I believe are the same as in his kit, and I used those on the protobuild. Probably a difference between BB and PCB, but things sure seem a lot tighter on the proto.

I think there were some cheaper alternatives out there?

E-Rex and Photon - one cool thing to put on a panel would be a set of pushbutton switches for the range control. I find myself finding variations that mesh with different intervals. With the rotary switch, one has to plow through the ranges to get from one to the other. Pushbuttons would let you jump from one to the other. Perhaps Andy's special pads on the PCB could be used for that, too. The external range input is good for that, too.

I've learned that, if I want to sleep, it's best just to avoid turning the Klee proto on.

Cheers,
Scott

mosc · Posted: Mon Sep 24, 2007 2:29 pm Post subject:

I built one of those IMSAI's when they first came out. The ALTAIR 8080 was the first. I went with the new technology. I learned a lot. Started programming in assembly, wrote my own multi precision integer math package. Microsoft's first product, AFAIK, was Basic for these 8080 type computers.

But this is Off Topic...

State Machine · Posted: Mon Sep 24, 2007 6:29 pm Post subject:

State Machine · Posted: Mon Sep 24, 2007 6:39 pm Post subject:

Well, here is the entire finished Klee with the power supply mounted. Another view of just the power supply and another of an example of some of the modification we were doing during the testing. Keep in mind that the finished circuit boards will have no such components hanging onto the IC's like this. All the changes are fully incorporated into the PCB design. These two resistors are "lap" soldered right onto the pins of the operational amplifier legs. This particular modification added 140 millivolts hysteresis to the clock and load input comparator amplifiers.

Bill

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State Machine · Posted: Mon Sep 24, 2007 6:48 pm Post subject:

Dave Kendall · Posted: Tue Sep 25, 2007 4:47 am Post subject:

Uncle Krunkus · Posted: Tue Sep 25, 2007 5:16 am Post subject:

That is a beautiful little circuit Dave! That would make a very nice optional extra for the Klee. Ken comes up with some great ideas hey? The chip is a bit pricey, (AU$30) but worth every cent for what it does.

a.b.o.z. · Posted: Tue Sep 25, 2007 7:09 am Post subject:

from 200 pcs. of 1% resistors not one is 100K. most of them are 99-99.5
will those do right or i have to try another batch?

Uncle Krunkus · Posted: Tue Sep 25, 2007 7:18 am Post subject:

The resistors in question need to be matched "to each other" it's a ratio thing. So the important thing is how similar they are, not actually how close to 100K they are. If you have 25 of them which are between 99.2 and 99.3 then that's fine. I got 100 or so, measured them, and layed them out on a piece of paper with boxes marked 99.5, 99.6, 99.7 etc. I actually ended up with most in the 100.0 and 100.1 boxes, so those are the ones I used.

a.b.o.z. · Posted: Tue Sep 25, 2007 7:22 am Post subject:

oh then I'm cool.
thnx uncle

creekree · Posted: Tue Sep 25, 2007 5:30 pm Post subject:

state machine,

that looks a lot like a pc power supply - is it one?
i thought the consensus was that pc power supplies are bad for synth use,
OTOH, the klee is not a synth...
please enlighten me.

State Machine · Posted: Tue Sep 25, 2007 5:48 pm Post subject:

Uncle Krunkus · Posted: Tue Sep 25, 2007 6:36 pm Post subject:

Adam-V · Posted: Tue Sep 25, 2007 6:57 pm Post subject:

Can someone please point me in the direction of the latest schematics for the electro-music Klee? I'm struggling to find them; the only link I've found so far points to a non existent zip file of Uncle K's strip layout.

Cheers,
Adam-V

Uncle Krunkus · Posted: Tue Sep 25, 2007 7:22 pm Post subject:

Scott and I decided to hold off on posting the final schematics for the EM Klee, just in case it may have sparked competition for the PCB. Everyone who orders a set of PCBs will get a copy of the schematics, as well as the interconnect (which has been posted) plus build notes, operations manual etc. etc.
No doubt, at some time further down the track, Scott will release the final schems publicly, but we wanted to ensure the financial support which the EM Klee PCBs will pump into electro-music.com first.

Adam-V · Posted: Tue Sep 25, 2007 7:29 pm Post subject:

OK, Fair enough. I was kind of hoping to peruse them for the sake of customisation but I can wait for my PCBs to arrive before I do that.

Cheers,
Adam-V.

Randaleem · Joined: May 17, 2007 Posts: 456 Location: Northern CA, USA

creekree · Posted: Wed Sep 26, 2007 1:51 am Post subject:

fonik · Posted: Wed Sep 26, 2007 2:34 am Post subject:

i will use a cheap unregulated switching PSU for the klee (about 5.- EUR). the klee has it's own voltage source for the critical parts, so i should be fine with that. even more considering all the decoupling caps used for the PCBs and the ICs...

Dave Kendall

How about starting a new thread where people can post model numbers/details/whatever of switching PSUs that have successfully been used in synths? and maybe, more importantly, ones to avoid?

I'd start it meself, but, err, so far have chickened out and stuck to power one linear jobbies, so haven't got anything to post.....

cheers,
Dave