electro-music.com   Dedicated to experimental electro-acoustic
and electronic music
 
    Front Page  |  Articles  |  Radio
 |  Media  |  Forum  |  Wiki  |  Links  |  Store
Forum with support of Syndicator RSS
 FAQFAQ   CalendarCalendar   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   LinksLinks
 RegisterRegister   ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in  Chat RoomChat Room 
Live streaming at radio.electro-music.com

  host / artist show at your time

poster

Please visit the chat
 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Melody Generator XL
Post new topic   Reply to topic Moderators: mosc
Page 1 of 2 [46 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Goto page: 1, 2 Next
Author Message
PHOBoS



Joined: Jan 14, 2010
Posts: 4106
Location: Moon Base
Audio files: 607

PostPosted: Sun Sep 07, 2014 8:59 pm    Post subject: Melody Generator XL
Subject description: more bits and a chromatic version
Reply with quote  Mark this post and the followings unread

While I was experimenting with the melody generator I started thinking, why not make it larger with a 16 step counter instead of 10 ?!

The first version I drew up [1.0] uses a CD4029 (binary counter) + CD4514 (4-TO-16 decoder) to create a 16 step counter,
replacing the CD4017 in the orginal melody generator, followed by a CD4067 (16 channel mux) replacing the CD4051.
I don't have a CD4514, so the next version [1.1] uses another CD4067 as a decoder instead.

Although I have a couple of those CD4067's I rather use them for something else instead. So the next version [2.1]
uses 4x CD4051 (got a bunch of those) to replace the CD4067's.


note, these are all untested.


Melody Generator XL - V1.0.gif
 Description:
Melody Generator XL - V1.0
 Filesize:  63.4 KB
 Viewed:  817 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

Melody Generator XL - V1.0.gif



Melody Generator XL - V1.1.gif
 Description:
Melody Generator XL - V1.1
 Filesize:  64.14 KB
 Viewed:  384 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

Melody Generator XL - V1.1.gif



Melody Generator XL - V2.1.gif
 Description:
Melody Generator XL - V2.1
 Filesize:  88.4 KB
 Viewed:  473 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

Melody Generator XL - V2.1.gif



_________________
"My perf, it's full of holes!"
http://phobos.000space.com/
SoundCloud BandCamp MixCloud Stickney Synthyards Captain Collider

Last edited by PHOBoS on Sat Sep 27, 2014 9:44 am; edited 2 times in total
Back to top
View user's profile Send private message Visit poster's website AIM Address Yahoo Messenger MSN Messenger
PHOBoS



Joined: Jan 14, 2010
Posts: 4106
Location: Moon Base
Audio files: 607

PostPosted: Sun Sep 07, 2014 9:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

While looking at the schematics it seemed kinda ridiculous to have 2 4-bit binary to decimal converters in there.
And thinking a bit more about it I realized that I only have to compare the 4 bits and if they are the same reset the counter.
Well, I recently done something similar creating a 4029 preset counter with bounce.

So I tested it [V3.0] and it works Very Happy. however there are 2 problems with doing it binary instead of decimal.
As you can see in the previous circuits the in-/outputs of the converters aren't lined up but shifted one step
(2 steps in the original design). If you don't do this the counter won't count when the CTRL inputs are 0000 & 0001
and furthermore it can only count 15 steps max instead of 16.
Adding a step in binary is a bit more complex. It could be done with a full adder which seems to exist as a CD4008,.. if you can find it.
I did however make it possible to get 16 steps by adding the E input, when low the CD4029 doesn't get reset and counts from 0 to 15

Then there is another problem; threre is no step 0 to use as the output. I solved this by detecting when all outputs are low,
using a 4-input OR gate (diodes + resistor) followed by a transistor inverter.
But I didn't really like the transistor on the output in [V3.0] so I drew a version [V3.1] which uses a CD40106 inverter instead,
And I also used one to invert the E input which makes more sense to me. Which leaves 4 gates unused,..
If you don't have the CD4077 (quad XNOR) but do have the CD4070 (XOR) you could use it together with those inverters [V3.2].
Or make 4 oscillators and attach them to the CTRL inputs Very Happy


Melody Generator XL - V3.0.gif
 Description:
Melody Generator XL - V3.0
 Filesize:  61.59 KB
 Viewed:  403 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

Melody Generator XL - V3.0.gif



Melody Generator XL - V3.1.gif
 Description:
Melody Generator XL - V3.1
 Filesize:  67.09 KB
 Viewed:  370 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

Melody Generator XL - V3.1.gif



Melody Generator XL - V3.2.gif
 Description:
Melody Generator XL - V3.2
 Filesize:  66.01 KB
 Viewed:  407 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

Melody Generator XL - V3.2.gif



_________________
"My perf, it's full of holes!"
http://phobos.000space.com/
SoundCloud BandCamp MixCloud Stickney Synthyards Captain Collider
Back to top
View user's profile Send private message Visit poster's website AIM Address Yahoo Messenger MSN Messenger
synaesthesia



Joined: May 27, 2014
Posts: 275
Location: Germany
Audio files: 85

PostPosted: Tue Sep 09, 2014 8:26 am    Post subject: Reply with quote  Mark this post and the followings unread

Cool circuit PHOBoS. Took me a while to understand how it divides by 1, but I think I got it. With each clock it counts to 1 and immediately resets, producing a brief low pulse at the output.

However, thinking about a melody generator built with this, one thought struck me. The circuit will generate 16 frequencies, with a ratio of 1:16 between the lowest and the highest tone. That's 15 octaves apart...
It would be nice to have a circuit that uses 16 different dividers, but in a way so that the maximum ratio between lowest and highest frequency is something between 1:2 and 1:4. For example, if it would divide by 16,17,18,...31.

I tried to come up with a circuit for that and the closest I found is below. It uses Johnson counters and divides in 15 steps between 10 and 40. Too bad that the dividers are not sorted and that the division by 24 appears twice, haven't found an easy way around that yet.


divider10to40.PNG
 Description:
 Filesize:  28.11 KB
 Viewed:  359 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

divider10to40.PNG


Back to top
View user's profile Send private message
synaesthesia



Joined: May 27, 2014
Posts: 275
Location: Germany
Audio files: 85

PostPosted: Tue Sep 09, 2014 9:23 am    Post subject: Reply with quote  Mark this post and the followings unread

Right after posting this it struck me that it could be done exactly like PHOBoS did, but with a longer counter. One could use a 4040 for example and a magnitude comparator. My circuit library doesn't have the 4063 or 4585, so I used the 74LS85. This circuit should divide by 16,17,18,...31 if I got it right. Drawback is, however, that the resulting note frequencies wouldn't match the tones in a Just Scale too well.


Divider16to31.PNG
 Description:
 Filesize:  23.08 KB
 Viewed:  237 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

Divider16to31.PNG


Back to top
View user's profile Send private message
synaesthesia



Joined: May 27, 2014
Posts: 275
Location: Germany
Audio files: 85

PostPosted: Tue Sep 09, 2014 9:51 am    Post subject: Reply with quote  Mark this post and the followings unread

Found a better CMOS library for Kicad meanwhile. Maybe it could even be done like this, but the resulting output pulses from the comparator would always be really short.
Nevertheless, I would expect that the Johnson counter version sounds better because of the dividers it uses.


Divider16to31V2.PNG
 Description:
 Filesize:  17.54 KB
 Viewed:  308 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

Divider16to31V2.PNG


Back to top
View user's profile Send private message
PHOBoS



Joined: Jan 14, 2010
Posts: 4106
Location: Moon Base
Audio files: 607

PostPosted: Tue Sep 09, 2014 1:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

synaesthesia wrote:
The circuit will generate 16 frequencies, with a ratio of 1:16 between the lowest and the highest tone. That's 15 octaves apart...

It divides by 2,3,4,5,6,7,8,9,10,11,12,13,14,15,16.
/2 = 1 octave, /4 = 2 octaves, /8 = 3 octaves and /16 = 4 octaves (max)
But the pulsewidth stays the same (1 CLK cycle) so it's not a 50/50 output (except for the /2). (see diagram)

The last version you drew [Divider16to31V2] is pretty similar to the one I made. I wasn't familiar with the 4063/4585 so I used the XNOR's,
but that makes it even easier. I don't see a need for using the Q4 output though.

Quote:
Took me a while to understand how it divides by 1, but I think I got it. With each clock it counts to 1 and immediately resets, producing a brief low pulse at the output.

Actually the /1 isn't possible with my circuit because I don't use the reset pulse which as you already mentioned would be very short.
I think you could add a S/R flip flop to it so it's the same length as the CLK input, but that's more chips which I tried to keep at a minimum.
What I did is use the first step, when all outputs are 0, as the output. just as in the original melody generator.

I also thought about using the 4040, but it has that inverted CLK input so I used the CD4029 instead.
However you could use the 4040 with more comparators for an XXL version Very Happy (go crazy and chain a couple of 4040's Shocked)
You could also use a 4040 in the original circuit instead of the 4017. That would give you different octaves out at audio
frequencies, which isn't too interesting, but with an LFO it's nice as a CLK source for a sequencer/rhythm generator. Cool


Melody Generator XL - V3 timing.gif
 Description:
Meoldy Generator XL V3 timing diagram
 Filesize:  36.38 KB
 Viewed:  287 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

Melody Generator XL - V3 timing.gif



_________________
"My perf, it's full of holes!"
http://phobos.000space.com/
SoundCloud BandCamp MixCloud Stickney Synthyards Captain Collider
Back to top
View user's profile Send private message Visit poster's website AIM Address Yahoo Messenger MSN Messenger
synaesthesia



Joined: May 27, 2014
Posts: 275
Location: Germany
Audio files: 85

PostPosted: Tue Sep 09, 2014 2:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

You are correct about the octaves of course. My bad math. Embarassed
With regard to the /1 operation, you are using PRESET ENABLE with J1 to J4 wired to 0V. Wouldn't that have the same effect as an asynchronous reset?
Back to top
View user's profile Send private message
PHOBoS



Joined: Jan 14, 2010
Posts: 4106
Location: Moon Base
Audio files: 607

PostPosted: Tue Sep 09, 2014 3:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

synaesthesia wrote:
With regard to the /1 operation, you are using PRESET ENABLE with J1 to J4 wired to 0V. Wouldn't that have the same effect as an asynchronous reset?

yes it does, and you just made me realize something (maybe that's what you're getting at)
Quote:
As you can see in the previous circuits the in-/outputs of the converters aren't lined up but shifted one step
(2 steps in the original design). If you don't do this the counter won't count when the CTRL inputs are 0000 & 0001
and furthermore it can only count 15 steps max instead of 16.
Adding a step in binary is a bit more complex. It could be done with a full adder which seems to exist as a CD4008,.. if you can find it.

There is no need to shift all the 4 bits with an adder, just delay the comparator output with 1 CLK cycle.
does that happen when using a 4040 ? I'll have to experiment a bit more with it,..

_________________
"My perf, it's full of holes!"
http://phobos.000space.com/
SoundCloud BandCamp MixCloud Stickney Synthyards Captain Collider
Back to top
View user's profile Send private message Visit poster's website AIM Address Yahoo Messenger MSN Messenger
PHOBoS



Joined: Jan 14, 2010
Posts: 4106
Location: Moon Base
Audio files: 607

PostPosted: Sun Sep 14, 2014 6:18 pm    Post subject: Chromatic Melody generator
Subject description: 12 notes, 8 octaves
Reply with quote  Mark this post and the followings unread

I designed a chromatic version with 12 notes and 8 octaves Laughing
It's basically a combination of the standard melody generator and the Top Octave Generator by Analog Custom*
Posted Image, might have been reduced in size. Click Image to view fullscreen.
*which was posted here by RichardC64, but probably originated from this TOG thread

The original melody generator works by using a mux [CD4051] to reset a counter [CD4017] to create different divisions
of the original frequency, resulting in different notes. The TOG also works by resetting a counter [CD4040] (when all the
outputs that have diodes connected to them are high) except it doesn't have a mux but uses a seperate counter for
each note (it's polyphonic). So to create the chromatic melody generator I only used 1 counter, with a diodematrix to
create the 12 divisions and a mux [CD4067] to select which one to use.

I first translated the 4040 pinout chromatic values to the Q outputs (2..9) which resulted in the following table:
Code:
   | C# D  D# E  F  F# G  G# A  A# B  C 
----------------------------------------
Q2 | x  x  x  x  x  x  x              x
Q3 |             x     x  x  x  x  x  x
Q4 |    x     x        x  x  x  x  x  x
Q5 |       x  x     x  x     x     x
Q6 |    x     x  x     x  x        x  x
Q7 | x        x  x  x              x  x
Q8 | x  x  x                       x  x
Q9 | x  x  x  x  x  x  x  x  x  x
----------------------------------------


I then spend about 2 days trying to figure out if it was possible to reduce the amount of diodes by combining some
of the AND functions (the diodes and pullup resistor make up a multi input AND gate) by using actual AND gates.
I did get it reduced to about 50% using 8 AND gates instead, but it's easier (and probably even cheaper) to just
use diodes and solder it on some stripboard.

The last 3 outputs of the mux [I/O13...I/O15] don't have anything connected to them, so when selected there
won't be any sound. The 'C' is connected to both I/O0 and I/O12 but when I/O0 is selected it will be 1 octave
lower, more on that later Wink

The reset pulse needs to be divided by 2 to make a 50/50 squarewave which in the TOG is done by another
counter [CD4024], this also provides the different octaves. I used a CD4040 instead and added a mux to
select beween 8 octaves.

As mentioned when I/O0 of the CD4067 is selected the 'C' note will be one octave lower. This way the keyboard
starts with a C instead of C#. In the TOG this is achieved by using one more counter [CD4024] to create the extra C.
But since the melody generator isn't polyphonic I needed a counter and some sort of switch to select it when that C
is selected. I could add another mux but that seemed a bit overkill so I looked for a way to do it with one chip.
I first puzzled around for a while using a CD4013 which contains 2 D-type flipflops with S/R inputs. One to divide by 2
and then the other to switch,.. except I didn't get that part work.

So I thought about what other counters/dividers I had,.. 4017 ? hmm,.., 4029 with it's jam inputs ? hmmmmm,..
Well that actually worked Very Happy. Used as a counter the Q1 output is one octave lower then the input frequency. And by
connecting the input to the corresponding jam input (J1) aswell the output will be that same frequency when the preset pin
is high. It only needs to divide for that lower C which is when the ABCD note select inputs are all low. So by using an
OR gate the preset pin will be high when the ABCD inputs aren't all low.

I haven't tested it yet, except for the CD4029 octave switch and that seems to work, I just don't have enough
diodes left Rolling Eyes (there are 57 in the matrix). Well actually I do have ±500 1N4007's but they are too large to fit
next to each other and besides that I don't have any stripboard which will make it easier to put together.
But diodes and stripboard are ordered Cool


edit: fixed link for TOG thread


Chromatic Melody Generator.gif
 Description:
Chromatic Melody Generator circuit diagram
 Filesize:  94.59 KB
 Viewed:  539 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

Chromatic Melody Generator.gif



_________________
"My perf, it's full of holes!"
http://phobos.000space.com/
SoundCloud BandCamp MixCloud Stickney Synthyards Captain Collider

Last edited by PHOBoS on Fri Sep 19, 2014 11:21 am; edited 2 times in total
Back to top
View user's profile Send private message Visit poster's website AIM Address Yahoo Messenger MSN Messenger
synaesthesia



Joined: May 27, 2014
Posts: 275
Location: Germany
Audio files: 85

PostPosted: Tue Sep 16, 2014 2:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

Wow. That's a nice piece of work, PHOBoS. Very Happy Looking forward to hear it.
Back to top
View user's profile Send private message
PHOBoS



Joined: Jan 14, 2010
Posts: 4106
Location: Moon Base
Audio files: 607

PostPosted: Wed Sep 17, 2014 9:37 am    Post subject: Reply with quote  Mark this post and the followings unread

so do I Very Happy

I'm first testing a smaller version, which I'll post more info on later, but I ran into a weird problem.
It needs a divider on the output to turn the reset pulse into a squarewave and create the octaves.
On the small version I'm testing I used a CD4520 to which I could add resistors like the Gong Drone has Wink.
I build it straight onto some perf without breadboarding it first but it doesn't work.

I thought it might be a bad chip, bad solder connection or short, or something else like that.
However I'm testing it on breadboard and apparently using the CD4520 just doesn't work,
if I replace it with a CD4040 or CD4029 it works fine. Confused
(so now I have some resoldering to do)

_________________
"My perf, it's full of holes!"
http://phobos.000space.com/
SoundCloud BandCamp MixCloud Stickney Synthyards Captain Collider
Back to top
View user's profile Send private message Visit poster's website AIM Address Yahoo Messenger MSN Messenger
synaesthesia



Joined: May 27, 2014
Posts: 275
Location: Germany
Audio files: 85

PostPosted: Wed Sep 17, 2014 10:19 am    Post subject: Reply with quote  Mark this post and the followings unread

Strange. As you pointed out, one difference is that the 4040 counts on the negative edge, and the 4520 counts on the positive edge. The other difference is that the 4520 is a synchronous counter, while the 4040 is a ripple counter. Maybe that makes a difference here.
Back to top
View user's profile Send private message
PHOBoS



Joined: Jan 14, 2010
Posts: 4106
Location: Moon Base
Audio files: 607

PostPosted: Wed Sep 17, 2014 2:33 pm    Post subject: Reply with quote  Mark this post and the followings unread

synaesthesia wrote:
one difference is that the 4040 counts on the negative edge, and the 4520 counts on the positive edge.

That's why I also tested with a CD4029 although I don't think that would really matter. But I was just looking
at the datasheet and the 4520 can be both positive and negative edge triggered, depending on using the Clk or Enable input.
So I tried both but it doesn't work. I also tested putting an inverter in series (CD40106 & CD4069) but then even the
CD4040 doesn't work. Haven't tested with a CD4049 yet.

_________________
"My perf, it's full of holes!"
http://phobos.000space.com/
SoundCloud BandCamp MixCloud Stickney Synthyards Captain Collider
Back to top
View user's profile Send private message Visit poster's website AIM Address Yahoo Messenger MSN Messenger
PHOBoS



Joined: Jan 14, 2010
Posts: 4106
Location: Moon Base
Audio files: 607

PostPosted: Thu Sep 18, 2014 1:19 pm    Post subject: Reply with quote  Mark this post and the followings unread

PHOBoS wrote:
Haven't tested with a CD4049 yet.

I did and that works, but I'm using a CD4040 now anyway.

So the mini version,.. which actually somewhat inspired by the Gong Drone Wink
I thought it might be nice to use notes from a chord, which it will step through like a little arpeggiator.
I first wanted to do 4 notes for a major 7 chord,. but since a minor chord is only one different note, and I'm using an 8 input mux
I decided to add that aswell. So ABC = xx0 plays the major7 notes and xx1 plays the minor7.
Next I made a list of all the chords and which diode connections I would need for the different notes.
And from this list I choose the one with the least amount of diodes which turned out to be F#.

I put it together and after having replaced the CD4520 with a 4040 it worked, however it sounded a bit off. Confused
So I checked if I had the correct notes and corresponding diode connections which all seemed to be OK.
But I then recalculated the divisions, comparing them with the numbers from the TOG and noticed something.
The list of divisions and corresponding diode connections of the TOG isn't complete; Q1 is missing
(without it you can't get any odd divisions) so here is the updated list:
Code:
   | C  C# D  D# E  F  F# G  G# A  A# B  C
------------------------------------------
Q1 |    x        x        x  x        x  x
Q2 | x  x  x  x  x  x  x  x              x
Q3 | x              x     x  x  x  x  x  x
Q4 | x     x     x        x  x  x  x  x  x
Q5 | x        x  x     x  x     x     x   
Q6 |       x     x  x     x  x        x  x
Q7 | x  x        x  x  x              x  x
Q8 | x  x  x  x                       x  x
Q9 | x  x  x  x  x  x  x  x  x  x  x     
------------------------------------------


After I'd added the diodes it sounds a lot better, so I'm glad I tested this first before trying the large one.
Speaking of which I think you can just make the lower C by /478 instead of doing the octave down shift
with the CD4029 afterwards. (added those connections too)

some more info about the schematic
All the notes needed a connection to Q9 of U1, so I only used 1 diode and connected it straight to the reset input.
The connection bewteen Q9 and the reset input of U2 is just for easy soldering.

I should probably record something although it's not that interesting right now,.


miniARP.gif
 Description:
 Filesize:  66.49 KB
 Viewed:  401 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

miniARP.gif



_________________
"My perf, it's full of holes!"
http://phobos.000space.com/
SoundCloud BandCamp MixCloud Stickney Synthyards Captain Collider
Back to top
View user's profile Send private message Visit poster's website AIM Address Yahoo Messenger MSN Messenger
PHOBoS



Joined: Jan 14, 2010
Posts: 4106
Location: Moon Base
Audio files: 607

PostPosted: Mon Sep 22, 2014 5:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

I build the Chromatic Melody Generator. Cool

I started with soldering just the 4040 and diodematrix so I could test if the notes sounded correct.
Well they didn't. Some seemed ok,. but a couple were way off (like an octave higher). So I added another CD4040
(on breadboard) in parallel with the CLK and Reset lines and connected some LED's on the outputs so I could see how far
it counted. They were all wrong so I did some measurements and found a short between two tracks. I couldn't really see
anything but after some cleaning with a brush most of the notes were ok. However there were still 2 notes off and the weird
thing was that there was a reset pulse at the right time but the counter didn't reset, instead it skipped a couple of steps. Confused
I coudn't really find anymore shorts and I wondered if having the other CD4040 connected might have omething to
do with it. So I disconnected it and that worked. Very Happy

The next thing I added was an oscillator. I used a CD4046 in the same way as in the TOG schematic, but left
the tuning adjust trimpot and vibrato out. And then carried on soldering the rest of the circuit before testing it.

On the first test I didn't get any sound out. The oscillator was working, the divider was counting but something wasn't
working correct. I took the CD4067 out and tried making connections manually to select the different notes.
And after swapping out some CD4040's I got that part functioning correct too. In the meantime I had added a larger
timing capacitor to the oscillator so I could listen to all the outputs of the CD4040 that produces the notes, but when I
removed that some notes didn't work anymore. It did when I lowered the supply voltage. And after spending some
time trying to figuring out what might be the problem I got the idea of reducing the value of the pullup resistor
on the reset line. I was using 10K and it is 4k7 in the TOG. but I replaced it with a 2K2 just to be sure Wink
And that did it! Laughing

That was probably the reason why I had to swap some of the 4040's, they did seem to count correct when
tested on breadboard but didn't work in the circuit. And it might also be the same problem I had with the CD4520's
So I have to do some more tests with that one.


The Lower C works correct so no need for an extra divider. The only thing that is bugging me a little bit now is that
there is no sound when I/O13, I/O14 or I/O15 of the CD4067 is selected. Not that silence is bad but because it's all
grouped at the end it's very noticable when the D note select input is high. So now I'm thinking of reordering the notes
and leave I/O7, I/O11 and I/O15 unconnected. I'm also thinking of adding switches for each note so 'wrong' notes
can be turned off.


Below is a short range demo using a binary counter to increase both notes and octaves.
it's has a very wide range Shocked


PHOBoS - Chromatic Melody Generator - range demo.mp3
 Description:
PHOBoS - Chromatic Melody Generator range demo

Download
 Filename:  PHOBoS - Chromatic Melody Generator - range demo.mp3
 Filesize:  1.59 MB
 Downloaded:  694 Time(s)


_________________
"My perf, it's full of holes!"
http://phobos.000space.com/
SoundCloud BandCamp MixCloud Stickney Synthyards Captain Collider
Back to top
View user's profile Send private message Visit poster's website AIM Address Yahoo Messenger MSN Messenger
PHOBoS



Joined: Jan 14, 2010
Posts: 4106
Location: Moon Base
Audio files: 607

PostPosted: Mon Sep 22, 2014 5:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

and here's the updated schematic. Cool

note there is an error in the schematic, there shouldn't be a connection between pin 11 of U1 and pin 8 of U5.
pin 8 (and everything to the left of it) should of course be connected to GND. (updated schematic on page 2 of this thread)



Chromatic Melody Generator V2.gif
 Description:
Chromatic Melody Generator v2
 Filesize:  100.67 KB
 Viewed:  457 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

Chromatic Melody Generator V2.gif



_________________
"My perf, it's full of holes!"
http://phobos.000space.com/
SoundCloud BandCamp MixCloud Stickney Synthyards Captain Collider

Last edited by PHOBoS on Thu Jan 22, 2015 7:17 pm; edited 2 times in total
Back to top
View user's profile Send private message Visit poster's website AIM Address Yahoo Messenger MSN Messenger
Blue Hell
Site Admin


Joined: Apr 03, 2004
Posts: 22598
Location: The Netherlands, Enschede
Audio files: 224
G2 patch files: 319

PostPosted: Tue Sep 23, 2014 11:56 am    Post subject: Reply with quote  Mark this post and the followings unread

Shocked you will end up building a micro processor in CMOS and then execute programs on that .. when you go on like this Laughing

Nice generator!

_________________
Jan
Back to top
View user's profile Send private message Visit poster's website
DUBmatze



Joined: Feb 18, 2013
Posts: 150
Location: south Germaica (schwabilon)

PostPosted: Tue Sep 23, 2014 12:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

Blue Hell wrote:
Shocked you will end up building a micro processor in CMOS and then execute programs on that .. when you go on like this Laughing

so true...
Very Happy
i like it .....
Back to top
View user's profile Send private message Visit poster's website
PHOBoS



Joined: Jan 14, 2010
Posts: 4106
Location: Moon Base
Audio files: 607

PostPosted: Tue Sep 23, 2014 2:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

Here's the stripboard layout for the tone generating section. The rest is mostly point to point wiring so not much use in drawing that.
You could also just add a divider and some switches to make a simple keyboard.

I don't know why it only lists the first 7 diodes, but the rest are 1N4148 aswell, not that it matters much what you use.


Chromatic Melody Generator stripboard.jpg
 Description:
 Filesize:  809.89 KB
 Viewed:  311 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

Chromatic Melody Generator stripboard.jpg



_________________
"My perf, it's full of holes!"
http://phobos.000space.com/
SoundCloud BandCamp MixCloud Stickney Synthyards Captain Collider
Back to top
View user's profile Send private message Visit poster's website AIM Address Yahoo Messenger MSN Messenger
Cynosure
Site Admin


Joined: Dec 11, 2010
Posts: 949
Location: Toronto, Ontario - Canada
Audio files: 82

PostPosted: Fri Sep 26, 2014 7:51 am    Post subject: Reply with quote  Mark this post and the followings unread

Wow Phobos! this is really impressive! Amazing work yet again Smile
Back to top
View user's profile Send private message
PHOBoS



Joined: Jan 14, 2010
Posts: 4106
Location: Moon Base
Audio files: 607

PostPosted: Sat Sep 27, 2014 3:18 am    Post subject: Reply with quote  Mark this post and the followings unread

I've been making some lists to see if I can produce notes of a chord, like the miniARP but with less than 9 bits.

I'm using the following ratio list from this page, focusing on the just scale.
Code:
|------------------+----------------------+----------------------|  |------|
|    Interval      | Ratio to Fundamental | Ratio to Fundamental |  | note |
|                  |     Just Scale       |  Equal Temperament   |  |      |
|------------------+----------------------+----------------------|  |------|
| Unison           |              1.0000  |        1.0000        |  |  C   |
| Minor Second     |      25/24 = 1.0417  |        1.05946       |  |  C#  |
| Major Second     |        9/8 = 1.1250  |        1.12246       |  |  D   |
| Minor Third      |        6/5 = 1.2000  |        1.18921       |  |  D#  |
| Major Third      |        5/4 = 1.2500  |        1.25992       |  |  E   |
| Fourth           |        4/3 = 1.3333  |        1.33483       |  |  F   |
| Diminished Fifth |      45/32 = 1.4063  |        1.41421       |  |  F#  |
| Fifth            |        3/2 = 1.5000  |        1.49831       |  |  G   |
| Minor Sixth      |        8/5 = 1.6000  |        1.58740       |  |  G#  |
| Major Sixth      |        5/3 = 1.6667  |        1.68179       |  |  A   |
| Minor Seventh    |        9/5 = 1.8000  |        1.78180       |  |  A#  |
| Major Seventh    |       15/8 = 1.8750  |        1.88775       |  |  B   |
| Octave           |              2.0000  |        2.0000        |  |  C   |
|------------------+----------------------+----------------------|  |------|


and this list of chords from wikipedia
Code:
|-------------------------+-------------|
|    Chord                |   notes     |
|-------------------------+-------------+
| Diminished triad        | C  D# F#    |
| Minor      triad        | C  D# G     |
| Major      triad        | C  E  G     |
| Augmented  triad        | C  E  G#    |
|-------------------------+-------------|
| Diminished      seventh | C  D# F# A  |
| Half-diminished seventh | C  D# F# A# |
| Minor           seventh | C  D# G  A# |
| Minor major     seventh | C  D# G  B  |
| Dominant        seventh | C  E  G  A# |
| Major           seventh | C  E  G  B  |
| Augmented       seventh | C  E  G# A# |
| Augmented major seventh | C  E  G# B  |
|-------------------------+-------------|


I then converted them to get the divisions needed when using a counter to produce the right notes.
this resulted in the following list for the triads:
Code:
|----------------------------|
|   Diminished triad:        |
| C   1/1  = 90 /90  1011010 |
| D#  6/5  = 90 /75  1001011 |
| F# 45/32 = 90 /64  1000000 |
|----------------------------|
|   Minor triad:             |
| C   1/1  =  6 /6       110 |
| D#  6/5  =  6 /5       101 |
| G   3/2  =  6 /4       100 |
|----------------------------|
|   Major triad:             |
| C   1/1  = 15 /15     1111 |
| E   5/4  = 15 /12     1100 |
| G   3/2  = 15 /10     1010 |
|----------------------------|
|   Augmented triad:         |
| C   1/1  = 40 /40   101000 |
| E   5/4  = 40 /32   100000 |
| G#  8/5  = 40 /25   011001 |
|----------------------------|

the one that immediately stood out for me is the minor triad that can be made by dividing a frequency by 4, 5 and 6.
Which is part of what the original melody generator does. Very Happy
the major triad is also interesting with only 4 bits but I'll come back to that one with the seventh list.

The notes of both Major and Minor triads can be made with 5 bits
Code:
|------------------------|
| Major + Minor Triads:  |
|------------------------|
| C  1/1 = 30 /30  11110 |
| D# 6/5 = 30 /25  11001 |
| E  5/4 = 30 /24  11000 |
| G  3/2 = 30 /20  10100 |
|------------------------|



Here's the list for the sevenths:
Code:
|-----------------------------|
|   Diminished seventh:       |
| C   1/1  = 270 /270         |
| D#  6/5  = 270 /225         |
| F# 45/32 = 270 /192         |
| A   5/3  = 270 /162         |
|-----------------------------|
|   Half-diminished seventh:  |
| C   1/1  =  90 /90  1011010 |
| D#  6/5  =  90 /75  1001011 |
| F# 45/32 =  90 /64  1000000 |
| A#  9/5  =  90 /50  0110010 |
|-----------------------------|
|   Minor seventh:            |
| C   1/1  =  18 /18    10010 |
| D#  6/5  =  18 /15    01111 |
| G   3/2  =  18 /12    01100 |
| A#  9/5  =  18 /10    01010 |
|-----------------------------|
|   Minor major seventh:      |
| C   1/1  =  30 /30    11110 |
| D#  6/5  =  30 /25    11001 |
| G   3/2  =  30 /20    10100 |
| B  15/8  =  30 /16    10000 |
|-----------------------------|
|   Dominant seventh:         |
| C   1/1  =  45 /45   101101 |
| E   5/4  =  45 /36   100100 |
| G   3/2  =  45 /30   011110 |
| A#  9/5  =  45 /25   011001 |
|-----------------------------|
|   Major seventh:            |
| C   1/1  =  15 /15     1111 |
| E   5/4  =  15 /12     1100 |
| G   3/2  =  15 /10     1010 |
| B  15/8  =  15 /8      1000 |
|-----------------------------|
|   Augmented seventh:        |
| C   1/1  = 360 /360         |
| E   5/4  = 360 /288         |
| G#  8/5  = 360 /225         |
| A#  9/5  = 360 /200         |
|-----------------------------|
|   Augmented major seventh:  |
| C   1/1  = 120 /120 1111000 |
| E   5/4  = 120 /96  1100000 |
| G#  8/5  = 120 /75  1001011 |
| B  15/8  = 120 /64  1000000 |
|-----------------------------|


Most interesting to me is the Major seventh which, like the Major triad, can be made with 4 bits.
And you could add an A to the notes aswell.
Code:
| A   5/3  =  15 /9      1001 |

The Dimished and Augmented seventh chords need 9 bits so that's not an improvement.

with 5 bits you can make the following notes:
Code:
|-----------------------------|
|   5 bit chord notes:        |
| C   1/1  =  30 /30    11110 |
| D#  6/5  =  30 /25    11001 |
| E   5/4  =  30 /24    11000 |
| G   3/2  =  30 /20    10100 |
| A   5/3  =  30 /18    10010 |
| B  15/8  =  30 /16    10000 |
|-----------------------------|

and a bit less accurate the following notes too, but they may sound bad:
Code:
|-----------------------------|
| F# 45/32 ±  30 /21    10101 |
| G#  8/5  ±  30 /19    10011 |
| A#  9/5  ±  30 /17    10001 |
|-----------------------------|

_________________
"My perf, it's full of holes!"
http://phobos.000space.com/
SoundCloud BandCamp MixCloud Stickney Synthyards Captain Collider

Last edited by PHOBoS on Sat Sep 27, 2014 12:38 pm; edited 3 times in total
Back to top
View user's profile Send private message Visit poster's website AIM Address Yahoo Messenger MSN Messenger
PHOBoS



Joined: Jan 14, 2010
Posts: 4106
Location: Moon Base
Audio files: 607

PostPosted: Sat Sep 27, 2014 3:21 am    Post subject: Reply with quote  Mark this post and the followings unread

Here's a circuit that should play the notes of a Major seventh chord Cool
Code:
|-----------------------------|
|   Major seventh:            |
| C   1/1  =  15 /15     1111 |
| E   5/4  =  15 /12     1100 |
| G   3/2  =  15 /10     1010 |
| B  15/8  =  15 /8      1000 |
|-----------------------------|


note: the CD4520 does indeed work when using a smaller pullup resistor.


microARP.gif
 Description:
PHOBoS - microARP
 Filesize:  17.91 KB
 Viewed:  396 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

microARP.gif



_________________
"My perf, it's full of holes!"
http://phobos.000space.com/
SoundCloud BandCamp MixCloud Stickney Synthyards Captain Collider
Back to top
View user's profile Send private message Visit poster's website AIM Address Yahoo Messenger MSN Messenger
DUBmatze



Joined: Feb 18, 2013
Posts: 150
Location: south Germaica (schwabilon)

PostPosted: Sat Sep 27, 2014 7:26 am    Post subject: Reply with quote  Mark this post and the followings unread

OH SHIT -
now you got my attention....

i was trying to build a "Three-toed sloth"-mashine with 4 chords. But i give it up the tuning is hard. (4cords [C,F,G,Dm] == 9 notes, -> 10 Trimpots, 3*4093) and i killed the old guitartuner while i had it on breadboard, seems he dont like the 5V Square....


a cool option for the (nonchords) melodygenerator will be a pentatonic switch (only C D E G A)....
Back to top
View user's profile Send private message Visit poster's website
PHOBoS



Joined: Jan 14, 2010
Posts: 4106
Location: Moon Base
Audio files: 607

PostPosted: Sat Sep 27, 2014 9:30 am    Post subject: Reply with quote  Mark this post and the followings unread

DUBmatze wrote:
a cool option for the (nonchords) melodygenerator will be a pentatonic switch (only C D E G A)....


Code:
|-----------------------------|
|   Pentatonic:               |
| C   1/1  =  45 /45   101101 |
| D   9/8  =  45 /40   101000 |
| E   5/4  =  45 /36   100100 |
| G   3/2  =  45 /30   011110 |
| A   5/3  =  45 /27   011011 |
|-----------------------------|


or a less accurate 4bit version:
Code:
|-----------------------------|
|   4bit Pentatonic:          |
| C   1/1  =  15 /15     1111 |
| D   9/8  ±  15 /13     1101 |
| E   5/4  =  15 /12     1100 |
| G   3/2  =  15 /10     1010 |
| A   5/3  =  15 /9      1001 |
|-----------------------------|


you might want to take a look at this thread.

_________________
"My perf, it's full of holes!"
http://phobos.000space.com/
SoundCloud BandCamp MixCloud Stickney Synthyards Captain Collider
Back to top
View user's profile Send private message Visit poster's website AIM Address Yahoo Messenger MSN Messenger
DUBmatze



Joined: Feb 18, 2013
Posts: 150
Location: south Germaica (schwabilon)

PostPosted: Sat Sep 27, 2014 9:53 am    Post subject: Reply with quote  Mark this post and the followings unread

PHOBoS wrote:
you might want to take a look at this thread.

... that was the day when is start this thing but no counters or dividers in stock .... and after that long time i still have 380 x 4093 in my box.
Shocked
Back to top
View user's profile Send private message Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic Moderators: mosc
Page 1 of 2 [46 Posts]
View unread posts
View new posts in the last week
Goto page: 1, 2 Next
Mark the topic unread :: View previous topic :: View next topic
 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
e-m mkii

Please support our site. If you click through and buy from
our affiliate partners, we earn a small commission.


Forum with support of Syndicator RSS
Powered by phpBB © 2001, 2005 phpBB Group
Copyright © 2003 through 2009 by electro-music.com - Conditions Of Use