also at the back there on the AUX FB send/FB return connections i tried a 100K trimmer , set to about 4 or 5K set the feedback kicking in at about 2 o clock on the main feedback pot, are these connections for further proccesing ??.
Joined: Oct 13, 2007 Posts: 6221 Location: near Austin, Tx, USA
Audio files: 270
Posted: Sun Jan 30, 2011 9:51 am Post subject:
Yes Dave, those feedback connections wore for anyone who wanted to put in a filter or delay or anything really into the feedback loop. I think it was wmonk who wanted that. I added it last minute.
Les _________________ "Let's make noise for peace." - Kijjaz
Yes Dave, those feedback connections wore for anyone who wanted to put in a filter or delay or anything really into the feedback loop. I think it was wmonk who wanted that. I added it last minute.
Les
do those connections have standard modular levels, or should I add a little circuit there to compensate for that? Can't wait to add a frequency shifter in the loop _________________ Weblog!
Thanks Les, i think i will link them or maybe use a 1K5 res coupling them , gonna try setting the v/oct , before dinner then couple it up to the modular for a bit of KS sounds
Joined: Mar 28, 2006 Posts: 1497 Location: Kansas City, Mo USA
Audio files: 45
Posted: Mon Jan 31, 2011 10:05 pm Post subject:
Inventor wrote:
I'm not sure but I think the levels are 0V to 5V. LOL you would think that I would frickin know how my own board works but I don't recall...
Les
Yes indeed, and there are clamp diodes as part of the feedback return -- so the circuit is protected against out-of-range voltages. _________________ -- Kevin http://kevinkissinger.com
Joined: Oct 13, 2007 Posts: 6221 Location: near Austin, Tx, USA
Audio files: 270
Posted: Tue Feb 01, 2011 12:36 am Post subject:
rosch wrote:
hi Les,
i'd like to build your Boolean Sequencer, could you please point me to the latest schematic?
thank you!
rosch, to make a boolean sequencer you can be creative. I don't so much have a schematic as I have a description, and here it is:
Start with an LFO square wave suitable for driving CMOS such as a 555 timer ciricuit. Send that into a CD4040 binary counter to get a 12 bit binary count. Attach any logic you wish to that binary count, including no logic at all. Add a resitive aggregator to the bits. This gives you CV. For KS stim, just add a series 0.1uF capacitor. Aggregator should use resistors in the 100kOhm range.
OK that's a lot to say but it summarizes the design. It's interesting, the history of it, one time in a ChucK software version, I could swear I heard the theme from the old TV show Bonanza. I think the history of this thing goes way back, I just re-inbented it and talked it up on the forum. So to summarize, you need:
Almost finished the Dual KS module i've been working on ,
Need to tweak the vco cv tuning a bit , but it's working cool so far .
I adjusted the sweep of the VCO & VCF by using a resistor on the + pot connections (MN3208 chip pcb 39K & 100K / MN3209 chip 37K & 120K).
I also decided to install the feedback send & receive sockets with the socket switching contacts allowing the feedback circuit when no jacks are plugged in , that caught me out during first switch on , heh .
heres some pics ....
KS back hardware.JPG
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KS with pots & sockets on.JPG
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KS working in the modular.JPG
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Joined: Oct 13, 2007 Posts: 6221 Location: near Austin, Tx, USA
Audio files: 270
Posted: Sun Feb 13, 2011 12:44 pm Post subject:
Looks great Dave, now I'm extra happy I sent you a second board. As you know, you can not only use the second board as a second voice, but you can use it as a resonator for the first board or for other stuff. The fact that you opened up the feedback path only adds to the possibilities. Well done, can't wait to hear some tunes.
Les _________________ "Let's make noise for peace." - Kijjaz
Dan ... Thank you , this was fun to build & fine tune read all the pages of this thread if anyone is starting a fresh pcb , lots of handy info .
Bill , Hey thanks Bill .... the jacks are pvc mono switching ones for all CV's & chrome switching ones for audio (same as the rest of the modular) all from Rapid uk electronics, front panel is a sticker , i designed the layout myself on Corel draw programme then took the panel files on a memory stik to my local sign makers shop ,
White printable adhesive vinyl with lazer printed blue ink design giving the impression of a white print ( white ink is available for his big Roland printer but is very expensive to buy in just for my prints)
so it is an inverted print with blue only outline leaving the clean white underneath.
i could have sprayed with a clear laquer but i have found the prints to be quite robust for home only use .
Les ..... i've been getting some crazy sounds from these , my fave is running the MN3209 KS as a bass line with the MN3208 acting as a sub osc both fed from the same cv input
Here is the dual KS running from a RYK m-185 sequencer i built with me playing along with the Roland TD electronic drum kit (some bad drum timing in there :) heh) all sounds from Dual KS apart from the drum kit sounds
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KS arpp & twidle em.mp3
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Dual KS running from an arpp (midi to cv converted) from my Yamaha RM1X hardware sequencer to the vco cv in , while turning KS dials + lfo to vcf cv in
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KS 1 into KS2 feedback loop em.mp3
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KS 1 into KS 2 feedback loop both running from the same sequencer cv
Thanks for having a listen , this is a great project to build ...if you pay attention to the thread , all good
Dave
KS modulated by VCO & lfo em.mp3
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KS modulated by a MFOS vco at audio freq and beyond into the stim / trig input with fast lfo's on the vcf cv input
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KS with echobase in FX loop & 4 lfo's em.mp3
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KS with my diy "Echo-base" delay FX patched into the feedback loop , vc-lfo varies the echobase delay time & pwm pulse from the same lfo to the stim / trig input .........my first impressions was a high altitude cloud of B-17's all riding t
Joined: Oct 13, 2007 Posts: 6221 Location: near Austin, Tx, USA
Audio files: 270
Posted: Mon Feb 14, 2011 1:34 am Post subject:
I listened to the first one and the last one so far. The first one is very much a conventional "song" music style to me, being what you could make with plain stringed instruments and drums. The second one starts out like a bunch of propeller airplanes flying overhead in formation, then changes to a helicopter, then a UFO, then crazy weird stuff. I love it! I will return to hear the others another time, thanks Dave!
Les _________________ "Let's make noise for peace." - Kijjaz
Joined: Jun 29, 2007 Posts: 1113 Location: Loss Angeles
Audio files: 3
Posted: Wed Mar 23, 2011 11:37 am Post subject:
Hi all!
I am a touch confused about the expo "error" described in the thread, regarding pinout for the transistors.
Looking at the parts side of the PCB, with the power connectors at the top, are the transistor pins like this, starting from 9 O'Clock, top trannie far left pin going clockwise: EBCEBC ?
Thanks! _________________ We are selling emotions, there are no emotions in a grid. -mwagener
"IC 741. Sometimes you don't want fidelity." -Small Bear Electronics Catalog
Joined: Jun 29, 2007 Posts: 1113 Location: Loss Angeles
Audio files: 3
Posted: Tue Mar 29, 2011 12:55 pm Post subject:
And by that, I mean was the schematic corrected per the mistake found a few pages back in this thread? _________________ We are selling emotions, there are no emotions in a grid. -mwagener
"IC 741. Sometimes you don't want fidelity." -Small Bear Electronics Catalog
Joined: Jun 29, 2007 Posts: 1113 Location: Loss Angeles
Audio files: 3
Posted: Wed Mar 30, 2011 10:27 am Post subject:
I tend to see components with all manner of different pinout...of the same type/number. I've seen 2N3904 with entirely different pinout than the ones I got from another store, so a physical representation is good but not "the" solution. I plan to try THAT 340 transistor arrays for a board's two sets of expo trannies. I guess that I have to conclude that the error noted a couple of pages back supercedes the schematic? I'll try that. Thanks, sorry. _________________ We are selling emotions, there are no emotions in a grid. -mwagener
"IC 741. Sometimes you don't want fidelity." -Small Bear Electronics Catalog
Joined: Oct 13, 2007 Posts: 6221 Location: near Austin, Tx, USA
Audio files: 270
Posted: Thu Mar 31, 2011 11:52 pm Post subject:
Sorry folks, i've been guess where - the hospital - again! eek! I'm good, they just freaked out over a little high blood pressure but they did figure out that my sleep apnea machine needs recalibration. Anyway i'm sprung free out of jail and I've got high priority other work but soon I will delve into this transistor thing and do an updated schematic or whatever is needed to remedy the problem.
Les
p.s. i'm sorry but my time is divided and i am SO VERY THANKFUL for all those who have carried the torch in my absence. Be back on this soon as i can!!! _________________ "Let's make noise for peace." - Kijjaz
Joined: Oct 13, 2007 Posts: 6221 Location: near Austin, Tx, USA
Audio files: 270
Posted: Fri Apr 01, 2011 5:38 am Post subject:
thanks Andy, I'm poked, prodded, injected, dejected, and psychologically wrung out but damn does it feel good to get out of that God-forsaken Hell hole of a hospital! four days without a computer or music! Arrrgh!!
Les
p.s. they kept offering me TELEVISION! ew! _________________ "Let's make noise for peace." - Kijjaz
Joined: Oct 13, 2007 Posts: 6221 Location: near Austin, Tx, USA
Audio files: 270
Posted: Fri Apr 01, 2011 5:43 am Post subject:
oh, one note regarding the bjt mixup, it might be me (most likely), it might be a schematic error from the source (unlikely) or it might be an adjustment at the board house (possible but unlikely), but whatever it is you should know this: when you hook a bjt up backwards, what you get is, well, a bad bjt. In other words if you reverse emitter and collector but keep the base connected properly, you just get an out-of-spec, poorly operating bjt but IT WILL STILL WORK OK.
That's why i did testing to a rough degree and didn't really notice. It was good enough for me. But cooler heads prevail and our patient and methodical brethren (especially Kevin) got down to the real cause and stuff. I will get to this and update the schematic as soon as i can.
Les
p.s. in other words, just solder it best you can, it will work if not optimally. _________________ "Let's make noise for peace." - Kijjaz
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then couple it up to the modular for a bit of KS sounds 
