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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Kequencer
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rich decibels



Joined: Apr 01, 2010
Posts: 59
Location: Wellington, NZ
Audio files: 1

PostPosted: Wed Dec 15, 2010 6:13 pm    Post subject: Kequencer
Subject description: Polyphonic chiptune generator
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I had an idea the other day and I couldn’t decide if it was good or not so I just built it to find out.

Posted Image, might have been reduced in size. Click Image to view fullscreen.



Eight oscillators, an on-button and a pitch knob for each. First you adjust the pitch of each oscillator so they’re vaguely in tune with each other. Then you flick on the sequencer. Then you play polyphonic chiptunes.

So here’s what’s under the hood.
Posted Image, might have been reduced in size. Click Image to view fullscreen.

The block on the bottom left generates the clock signal that sets the tempo. C1 & R6 set the clock rate (R1 limits the maximum frequency so you can’t burn out the chip). With that clock signal being fed into the 4017, outputs Q0 to Q7 momentarily go high one after another.

The subcircuit denoted by the circle outline is repeated 8 times. It includes the indicator LED, mode switch S1, pushbutton S2, and oscillator for each of the 8 steps. The oscillator is only on so long as pin 1 is high. This high pulse can come either from the 4017 outputs, or from the pushbutton.

The outputs of all 8 oscillators are tied together via 100K resistors (R5), which is a very lofi way of keeping them buffered from each other. From there the output module is up to you. The simplest thing to do is have R7 set to about 1k – this will drive headphones directly but I can’t quite guarantee that’s a good idea. I used my rudimentary knowledge of opamps to make it more closely resemble a line-level output. In my box I also included a little amplifier module I had lying around so it makes good loud noise on its own.
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Blue Hell
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PostPosted: Wed Dec 15, 2010 7:03 pm    Post subject: Reply with quote  Mark this post and the followings unread

Looks great! Interesting circuit too Cool
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RF



Joined: Mar 23, 2007
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Location: Northern Minnesota, USA
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PostPosted: Wed Dec 15, 2010 7:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yay!
Congrats - fun stuff and a nicely finished build!

bruce

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Cynosure
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Joined: Dec 11, 2010
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PostPosted: Thu Dec 16, 2010 4:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

Awesome! I like it. It gave me some ideas for my next project. Thanks! Smile
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Top Top



Joined: Feb 02, 2010
Posts: 221
Location: California

PostPosted: Thu Dec 16, 2010 11:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

Fun design, and nice little tune you are playing on it there.

It is sort of a similar concept to this synth/sequencer I built:





Mine is also 4093 gatable oscillators. But I decided I wanted to be able to trigger any of the (7 in my case) oscillators on any step. I have been wanting to add some little momentary buttons like you have for "playing" the oscillators (that is what the holes on the bottom are for, still haven't added them).

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cloudscapes



Joined: Feb 09, 2004
Posts: 100
Location: Montreal

PostPosted: Fri Dec 17, 2010 10:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

really inspiring build, thanks for sharing!
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stolenfat



Joined: Apr 17, 2008
Posts: 437
Location: Sunny Oakland California
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PostPosted: Sat Dec 18, 2010 5:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

great little twists makes a very unique sounds! far out!

Perhaps an extra step before the summed out to turn on off an extra series of gates like that 4077 ringmod ect ect?

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stolenfat



Joined: Apr 17, 2008
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PostPosted: Sun Dec 19, 2010 6:40 am    Post subject: Reply with quote  Mark this post and the followings unread

Woa amigo, the more i listen to your clip, the more i love it! Double congrats!
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rich decibels



Joined: Apr 01, 2010
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Location: Wellington, NZ
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PostPosted: Sun Dec 19, 2010 3:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks everyone! Made a board layout for a friend, thought I might as well post it here for reference.


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droffset



Joined: Feb 02, 2009
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Location: London and Oxford
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PostPosted: Sun Dec 19, 2010 4:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

That's really great, congrats. Smile
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Check out the FREE Intro to Lunettas Document
https://docs.google.com/Doc?docid=0AZIwOP-PR9sSZDlidzgzbV8wY3RjenJqanY&hl=en

Edit: Spelling mistakes.
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stolenfat



Joined: Apr 17, 2008
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Location: Sunny Oakland California
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PostPosted: Tue Mar 08, 2011 10:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

I've tried to replicate this awesome circuit on perfboard but it got really messy and my soldier run crossed and i blew my chips Sad


...so i decided to doodle up a pcb with Pad2Pad, a free pcb program.


the idea was for me to etch it myself, so i had to make it one sided which meant i needed to use a whole load of jumpers. its a little messy but you can figure it out.


the switch bay pads can be wired to as shown in the above diagrams, and the led bay is simple enough. connect the output bus to a jack and it's game on.

Also the 0pot, 1pot, 2pot ect will be the edge and center lugs of your potentiometers.

(i dont know how... but theres a small error on this PCB graphic on the 4093a's V+ run, which crosses several extra pins... it should be noted that this error is not on the 1:1 transfer graphic posted below)


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keyquencerPCB.png



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Last edited by stolenfat on Tue Mar 08, 2011 11:45 pm; edited 4 times in total
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stolenfat



Joined: Apr 17, 2008
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PostPosted: Tue Mar 08, 2011 11:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

looks like electro music wont let me post the actual files... seems like your all out of luck.

this PNG below should be 1:1 and ready to etch via the toner transfer method. (i havent printed it yet to test it myself)

use the above graphic as a reference, the part values should all be there, but you can pick your own as per the laws of lunetta.


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stolenfat



Joined: Apr 17, 2008
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PostPosted: Wed Mar 09, 2011 3:41 am    Post subject: Reply with quote  Mark this post and the followings unread

@ Top Top : where can i find more info on your design? its awesome, specially what filter are you using?
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kdowqo



Joined: Mar 10, 2011
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PostPosted: Thu Mar 10, 2011 10:08 am    Post subject: Reply with quote  Mark this post and the followings unread

im in the process of building something similar
all though i might be wrong about this, i think its a better idea to leave pin 4 on 4093a and 3 and 10 on 4093b unconnected
input and output connected together on a nand gate like u have done is like an inverter witch tells its input to be high witch makes the output low witch makes the output high and so on, an oscillator

its what this circuit is all about but those oscillations isn't meant to be and will most likely just cause problems
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stolenfat



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PostPosted: Tue Mar 15, 2011 2:14 am    Post subject: Reply with quote  Mark this post and the followings unread

really? well, hmm, that pcb layout i posted is still untested, in the process of gathering etching materials to see how well it works atm, but i thought one of the golden rules of lunetta was to not leave anything floating and to tie all unused pins to the ground.

rebuttal?

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kdowqo



Joined: Mar 10, 2011
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PostPosted: Tue Mar 15, 2011 4:34 am    Post subject: Reply with quote  Mark this post and the followings unread

in my circuit i use a 40106 for clock, 5 of the 6 inverters in that chip is unused and i have none of the unused pins connected to ground but i have had some ground issues so that might be the problem Razz

ill try grounding them
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rich decibels



Joined: Apr 01, 2010
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PostPosted: Sun Apr 03, 2011 3:29 am    Post subject: Reply with quote  Mark this post and the followings unread

Just finished my second take on the kequencer idea. Added fine-control pots, adjustable voltage supply, and a better output module. Full details, samples, etc on my blog if anyone's interested.




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