Electro-Music Klee Sequencer Build and Applications Thread

sduck · Posted: Tue Aug 12, 2008 9:33 am Post subject:

I finally got around to calibrating the klee this morning. Did it twice.

You know, all this "debugging" and/or brain adjustment I've been doing would go a lot smoother if I'd just read the manual. Neither of my previous questions would have come up! Anyway, NOW I've done all the testing, and everything is hunky dory (whatever that means).

I had to calibrate twice because I screwed it up the first time. When I was checking the ranges after the first calibration, I found most of the ranges to be pretty close, but not as close as I thought they'd be considering the accuracy of the voltages I'd set. I realized that I must have screwed up the zero offset calibration, and running through the process in my head, realized I'd done it without setting the first bit active - when you set the zero offset readings that way, you get a nice big .000 no matter where you set the trimmers. BTW Scott, this isn't mentioned in the manual, to make sure that the first bit is active, although I suspect I'm one of the few people that'll get caught by this - I did the check out section last night, and the calibration part this morning - if you do the whole thing in one session it's not an issue.

I couldn't get the third trimmer to .583v - only to .566, which is pretty close anyway, I suspect I can live with it.

Anyway, time to put the knobs on, and then go play!

Scott Stites · Posted: Tue Aug 12, 2008 10:17 am Post subject:

Nice to hear that it's working! Not sure why your zero adjust wouldn't work without a bit on - the offset trims apply voltage directly to the U8/U9 op amp inverting inputs, and whether a bit is on or not shouldn't affect it (as long as the pot controlling the bit is turned all to zero, if it's on). I guess I'll have to think about that. Very Happy

But, don't worry about that - as long as it's working. If you get to the point where you want to tune that range to .583, you could tack solder a resistor on top of R28 (in parallel with it). A 330K resistor would work fine, I'd think. That would move the expected max adjustment to 884 mV. The original 150K resistor value should give you a max range on that adjustment of around 625 mV, but could be resistor tolerance is working against you.

Cheerios,
Scott

Scott Stites · Posted: Tue Aug 12, 2008 10:24 am Post subject:

Hmmm...quick question - are you using banana jacks?

sduck · Posted: Tue Aug 12, 2008 11:24 am Post subject:

Nope, 1/4in switchcraft jacks. Maybe I should add that I turned the thing on it's back, powered it on, and calibrated it - so I didn't even press the load button at all the first time - maybe the big chips need to be initialized? I don't know, but it made a difference - the first time I thought I must be alright, as the dvm read .000 and turning the trimpot didn't make any difference, so I just moved on without thinking about it much.

sduck · Posted: Wed Aug 13, 2008 7:01 pm Post subject:

My god, it's full of stars!

fonik · Posted: Thu Sep 11, 2008 3:22 pm Post subject:

here are some new pictures of my klee. i recently finished it completely, say: i replaced the switching PSU by a linear PSU and incorporated marc barreille's midi 2 clock converter...

Uncle Krunkus · Posted: Thu Sep 11, 2008 5:16 pm Post subject:

Very nice! Very Happy

a.b.o.z. · Posted: Tue Sep 16, 2008 5:47 am Post subject: calibration of range switch

I've noticed that my klee is decalibrated somehow. When range switch is on position 5 (1V) reading I get when only one bit (step1) active is around 1.2V. This reading is on A output. So my question before I open cabinet and get thru rats nest is: Is voltage on pin1 of U8 also 1.2 when range switch on position 5?
Thnx

Ivan

Scott Stites · Posted: Tue Sep 16, 2008 10:49 am Post subject:

Yes. -1.2V, actually. Is it just that one range?

a.b.o.z. · Posted: Tue Sep 16, 2008 11:20 am Post subject:

It is supposed to be 1.2V on that position? How come I need to calibrate it to 1V on trimmer?

no i think all ranges are bit disturbed...i've taken psu out to calibrate it so can't tell you for shure but u think yes.

why is that?
it is then 1.2V per octave? not 1V per octave.
confused again.

Scott Stites · Posted: Tue Sep 16, 2008 11:42 am Post subject:

No, sorry - if it reads 1.2V on a single bit with a single pot cranked up, then it would read -1.2V at that point.

IOW, it should read the range value for 1 bit and one cranked pot at that point. Only negative. Very Happy

So, for 1V range, with one active bit, and the LED for that pot turned on, it should read -1V at pin 1 of U8.

Theoretically, the PS shouldn't affect it - the voltage is derived from a regulated voltage. I suppose a change in grounding could?

a.b.o.z. · Posted: Tue Sep 16, 2008 12:02 pm Post subject:

Ok thank you Scott.
Sorry for my bad-shitty confusing english.

Scott Stites · Posted: Tue Sep 16, 2008 12:13 pm Post subject:

Your English is better than what I run into around here, trust me! Very Happy

State Machine · Posted: Thu Sep 18, 2008 6:47 pm Post subject:

State Machine · Posted: Thu Sep 18, 2008 6:54 pm Post subject:

fonik · Posted: Fri Sep 19, 2008 12:16 am Post subject:

Scott Stites · Posted: Fri Sep 19, 2008 6:13 am Post subject:

That is one helluva nice looking Klee! It's the Fields of Clover model, right? Very Happy

State Machine · Posted: Fri Sep 19, 2008 8:46 am Post subject:

Pehr · Posted: Tue Oct 07, 2008 2:45 am Post subject:

I was on a Norwegian synth meeting this weekend and I brought the Klee of course.

When I tried to explain how it works I found that it was really hard. I should have printed the instructions from the Doc-thread and made an overview or something.

Anyway, there were lots of people that were interested in the Klee and I recommended them to check out EM for more info.

Here are some pictures from the meeting:

mosc · Posted: Tue Oct 07, 2008 10:37 am Post subject:

Hey, Pehr, that is one cool photo album/movie. Thanks for sharing. Very Happy

Scott Stites · Posted: Tue Oct 07, 2008 11:03 am Post subject:

Indeed, I enjoyed the hell out of it. What was that track?

The best quick explanation of a Klee goes like this: "You know how a sequencer has that one dot that moves along? The Klee can move more dots at the same time." Laughing

mosc · Posted: Tue Oct 07, 2008 11:36 am Post subject:

Fonik, splendid work. It looks beautiful.

Pehr · Posted: Tue Oct 07, 2008 1:02 pm Post subject:

Thanks! It was a really fun meeting. I'll remember that explanation for the next time Very Happy

It's a loong trip there though, 7 hours by car to get there Shocked

But it is worth it every time Cool

It's a friend of mine who took the pictures and put together the video, I'll ask him abt the track Razz

State Machine · Posted: Tue Oct 07, 2008 4:02 pm Post subject:

Pehr,

Thanks for the slide show and great music. Don't feel bad about explaining the Klee, I stumbled a bit myself doing a talk at a synthesizer convention last spring Wink

Thanks again for posting the show, I enjoyed that ....

Bill

Pehr · Posted: Tue Oct 07, 2008 11:24 pm Post subject:

Scotts short description is really good, but next time I'll print the 'Know The Klee, Draft 4' and show how the CV outs behave.

The track is called 'BMX mix/dj-set' and is composed by someone on the forum www.99.se/musik Razz