Joined: Nov 10, 2011 Posts: 878 Location: Lancashire, England
Audio files: 14
Posted: Sat Jan 21, 2012 7:34 am Post subject:
I will be adding more to this, so far it's basically MK2's circuit but with potentiometer control instead of light sensitive resistor control and switches on the 4051's binary control inputs.
The slacker melody generator acctually divides the initial frequency into a reverse harmonic series, a non-standard scale. So you can't play tunes based in the standard western scale but you can make new tunes with it!
P.S. You may recognise a small riff I was able to figure out _________________ As a mad scientist I am ruled by the dictum of science: "I could be wrong about this but lets find out"
Joined: May 18, 2010 Posts: 308 Location: Oak Park, IL
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Posted: Sat Jan 21, 2012 8:17 am Post subject:
Pretty cool set up . I like the push buttons on the controller inputs; I might have to consider adding those to my 4051. That is, when I get the time to finish my lunetta rehouse ! _________________ Zontar Prevails!
Joined: Nov 10, 2011 Posts: 878 Location: Lancashire, England
Audio files: 14
Posted: Sat Jan 21, 2012 8:48 am Post subject:
Go for it! It's really easy to get the hang of playing it, to learn all you really need is the truth table and pinouts from a datasheet for the 4051 http://www.alldatasheet.com/datasheet-pdf/pdf/173652/UTC/4051.html (see page 5) _________________ As a mad scientist I am ruled by the dictum of science: "I could be wrong about this but lets find out"
Joined: Jun 09, 2009 Posts: 132 Location: Honolulu HI
Audio files: 48
Posted: Sat Jan 21, 2012 8:21 pm Post subject:
Those some reused cat-5 twisted pairs I see? Approved.
Incidentally, if you go with a vco, it's possible to get something quite playable using a four button "binary" keyboard (four momentary switches either going straight to voltage dividers or a cmos analog switch with the outputs of the voltage dividers going to a summing circuit). It requires some practice to get the hang of the chording system for progressing along notes but it's kind of neat to be able to play tunes without moving your hand.
Joined: Nov 10, 2011 Posts: 878 Location: Lancashire, England
Audio files: 14
Posted: Sun Jan 22, 2012 5:59 am Post subject:
sizone wrote:
Those some reused cat-5 twisted pairs I see? Approved.
I once raided a skip outside a computer shop which was closing down
sizone wrote:
Incidentally, if you go with a vco, it's possible to get something quite playable using a four button "binary" keyboard (four momentary switches either going straight to voltage dividers or a cmos analog switch with the outputs of the voltage dividers going to a summing circuit). It requires some practice to get the hang of the chording system for progressing along notes but it's kind of neat to be able to play tunes without moving your hand.
A neat idea indeed I have worked on something similar which I will post in my weekend of weirdness thread; instead of four buttons I used four oscillators and an R2R ladder which controlled a VCO.
With four buttons though one could ass potentiometers to each to tune them to different notes
oh that reminds me, I have a half dead 555 synth I made which used a similar system; combinations of the four keys produced different notes as the frequency determining resistors were all in parallel.
Such a good idea that I had it several times myself _________________ As a mad scientist I am ruled by the dictum of science: "I could be wrong about this but lets find out"
Joined: Jan 15, 2020 Posts: 52 Location: wisconsin
Posted: Fri May 15, 2020 6:18 am Post subject:
Re: Lumelodyertron (based on a 4051 multiplexer) Subject description: current version: MK-4ish I think
JingleJoe wrote:
I was talking about this in another thread. It's not entirely original but here it is, the Lumelodyertron. (see attachment for circuit diagram) The other designs I have seen for a similar circuit didn't use a VCO and didn't use a 4093 for the oscs.
You could have different 4093's gated by the 4051 instead of the voltage divider, the possibilities are great, I'll certainly be making modifications to this design.
The binary input oscillators are controlled by LDR's which change the tune depending on the light level. I used a bunch of random resistors in my divider so mine sounds a bit erratic, however I put them in order of size and ended up with a logarithmic voltage increase, like a hertz per volt keyboard of ye olde korgs.
I also considered driving the resistor chain with another LFO or some crazy waveform, however I ran out of gates on the 4093 chip, maybe next time I will use two for added madness
P.S. video to come soon.
I realize this is an old post, but it's a very interesting circuit. I'm a newb, so forgive me, but I don't understand how the lower left oscillator is a voltage controlled oscillator? It's voltage controlled via the 4051 output? Or via some externally applied voltage?
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. I like the push buttons on the controller inputs; I might have to consider adding those to my 4051. That is, when I get the time to finish my lunetta rehouse 
!
I have worked on something similar which I will post in my weekend of weirdness thread; instead of four buttons I used four oscillators and an R2R ladder which controlled a VCO.
