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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
PHOBoS' Modular Lunetta
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PHOBoS



Joined: Jan 14, 2010
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PostPosted: Sat Dec 08, 2012 6:26 pm    Post subject: PHOBoS' Modular Lunetta`
Subject description: [4017 DECIMAL COUNTER] Module
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next:

4017 DECIMAL COUNTER

Don't think I need to mention anything about this one, except for using the CLK INH pin to hold/run the counter,
either with a switch or remotely.


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Last edited by PHOBoS on Sat Dec 08, 2012 6:57 pm; edited 1 time in total
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PHOBoS



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PostPosted: Sat Dec 08, 2012 6:39 pm    Post subject: PHOBoS' Modular Lunetta`
Subject description: [4043 NOR R/S LATCH] Module
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and the last of the 3:

4043 NOR R/S LATCH

It's Alive!, ALIVE!
well ok it's not really alive (yet) but it can remember some bits now. I also added an extra input for a total memory
wipe, and a switch so it can sleep sleeping but still remember the bits when it wakes up.


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PostPosted: Sat Dec 08, 2012 8:03 pm    Post subject: Reply with quote  Mark this post and the followings unread

Absolutely fantastic machine being built Cool ! With two kids and a wife to make happy, I'm lucky to have thrown together what I have. This however is frickin' awesome. Great job on the design of the modules; both in their technical capabilities and graphic design as well.

Looking forward to the completion of your "Death Star".

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PostPosted: Sun Dec 09, 2012 5:21 am    Post subject: Re: PHOBoS' Modular Lunetta
Subject description: [Flame-LED Oscillators] module
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PHOBoS wrote:

I soldered the LED's to the back of the front facing outwards, so they shine through the perfboard.
yes, I have a digital fireplace in my lunetta. Twisted Evil

Holy flurking snit. That's the best thing I've ever seen on a modular ever.
The only thing which could beat that is no less than 3 analogue meters each showing different LFOs and/or control voltages and/or frequencies.

Sounds great too, I'll have to read the rest of this when I'm not in the middle of building something Laughing

P.S. Before I forget, Mr Phobos, I have a serious offer to make if you're in the UK (for postage reasons). If you want some cheap narner sockets, I have experimented with all the best sockets for sale on rapid and I know which are the best of the best (none of those shitty ones with weak threads and flimsy nuts) so if you want some, we could co-purchase some when I buy them in bulk meaning they will be cheaper-per-socket.

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PostPosted: Sun Dec 09, 2012 5:47 am    Post subject: Reply with quote  Mark this post and the followings unread

Shocked Shocked Shocked

Cool

Embarassed

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PostPosted: Wed Jul 10, 2013 7:31 am    Post subject: Re: PHOBoS' Modular Lunetta`
Subject description: [4093 GATED OSCILLATORS] Module
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Thanks PhoBoS for all these great circuits and ideas you have posted. Much appreciated.

I have been playing around with this circuit and rather like it. But I have been wondering about the the reverse log pots for the frequency control. What are advantages in using these pots?


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

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PostPosted: Wed Jul 10, 2013 7:40 am    Post subject: Re: PHOBoS' Modular Lunetta`
Subject description: [4093 GATED OSCILLATORS] Module
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rumblin_cynth_rampo wrote:
I have been playing around with this circuit and rather like it. But I have been wondering about the the reverse log pots for the frequency control. What are advantages in using these pots?


I had the same thought, so I'm also interested in the answer. Also, does the double 4093 design help to eliminate thumps? I built some very simple 4093 single gate oscillators and they do tend to produce a thump when gated on or off.

Thanks,

Gary
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PHOBoS



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PostPosted: Wed Jul 10, 2013 11:23 am    Post subject: Re: PHOBoS' Modular Lunetta`
Subject description: [4093 GATED OSCILLATORS] Module
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rumblin_cynth_rampo wrote:
..,I have been wondering about the the reverse log pots for the frequency control. What are advantages in using these pots?
With reverse pots the circuit of course works exactly the same but the control is much nicer. With a linear pot the higher frequencies are kinda
clumped together on one side of the pot, so you have a lot of change with a slide adjustment on that side, while the lower frequencies are more
smeared out. With a reverse log pot it more evenly spread across the whole range. You could use a normal log pot, but then you have to wire
it so that if you turn it clockwise the frequency gets lower.
(I have to warn you though,. once you start using reverse log pots you might not want to go back to linear and they can be a bit pricey, at least they are for me Rolling Eyes )

analog_backlash wrote:
..,does the double 4093 design help to eliminate thumps? I built some very simple 4093 single gate oscillators and they do tend to produce a thump when gated on or off.

I don't know if the double design eliminates thumps, I haven't really noticed it though. Usually it is good practise to use an extra gate to
buffer these simple oscillators (same with CD40106), because the load can have an influence on the frequency. So having an extra gate adds
some stability. (Also making 4 oscillators out of one 4093 or 6 out of one 40106 could cause some problems with oscillators interfering with eachother).
However in this case I just used it to invert the output, so it is low when the oscillator is turned off. (inverted output is high of course Cool).

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PostPosted: Thu Jul 11, 2013 1:02 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Phobos,

I had kinda worked out what the reverse log pots were doing but wasnt too sure my thinking was right. Turns out it was reverse of what I thought. Good job I asked.

Non of the big UK suppliers (RS Rapid) seem to stock reverse log pots. Farnells do but it is one of their special order items and there is a 15 UKP handling charge and they dont seem to have a big selection. Mouser sells them but again they have a big old handling charge.

As to the "thumps" I havent noticed any. It is good to buffer things though and I do like the idea of being able to use an inverted signal if I want to.

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PostPosted: Thu Jul 11, 2013 1:50 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks also PHOBoS.

I may have slightly exaggerated with the word "thumps". It's a noticeable noise when they are gated on or off and yes, I have 4 oscillators on one 4093, so that may be adding to the problem. If I have other noises going on at the same time, I tend not to notice it so much anyway. I'll try using the extra gate for future circuits.

Rumblin... one place I know that does reverse log pots is Tayda Electronics:

http://www.taydaelectronics.com/potentiometer-variable-resistors/rotary-potentiometer/anti-log-reverse.html

These are based in Thailand, but I haven't had any problems with them (yet) and I know that other people on the site order from them. The only problem is the wait can be a bit long (about 7-10 days in my experience), unless you want to pay the extra for DHL. I'll probably order some reverse log pots myself soon, as I don't have any.

Gary
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PostPosted: Thu Sep 19, 2013 11:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

Really inspiring work PHOBoS, bravo!. How's it coming along?
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PostPosted: Tue Sep 24, 2013 7:29 am    Post subject: Reply with quote  Mark this post and the followings unread

garcho wrote:
Really inspiring work PHOBoS, bravo!. How's it coming along?

Thanks garcho. Very Happy
I haven't done anything on it for a while, when I started I was waiting for parts for another project so I made a start on the modular lunetta. I didn't
plan on making so many modules right away but once I got into it it went pretty quick. I do have some ideas for new modules, so maybe I'll work a
bit on it in the winter. But right now I got a couple of other synths I have to finish first Cool

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PostPosted: Sat Apr 19, 2014 6:03 pm    Post subject: 4015 Shift Register module Reply with quote  Mark this post and the followings unread

it's been a while but I added another module, nothing special but very useful:
a 4015 shiftregister with a switch to select between 2x4 or 1x8 Cool


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PostPosted: Wed Apr 23, 2014 7:49 am    Post subject: Reply with quote  Mark this post and the followings unread

Nice! I have a 4015 as well as a 4094 in my big machine. Shift registers help mangle up the order of things and are simple to wire up. You really can't go wrong building a lunetta based on just a few oscillators, maybe a divider or 2, some shift registers and and r/2r to mix them up. The rest is just gravy Laughing !
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PostPosted: Thu Apr 24, 2014 1:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

Draal wrote:
Nice! I have a 4015 as well as a 4094 in my big machine. Shift registers help mangle up the order of things and are simple to wire up. You really can't go wrong building a lunetta based on just a few oscillators, maybe a divider or 2, some shift registers and and r/2r to mix them up. The rest is just gravy Laughing !


Well said.

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PostPosted: Fri May 02, 2014 3:21 pm    Post subject: Reply with quote  Mark this post and the followings unread

Draal wrote:
Nice! I have a 4015 as well as a 4094 in my big machine. Shift registers help mangle up the order of things and are simple to wire up. You really can't go wrong building a lunetta based on just a few oscillators, maybe a divider or 2, some shift registers and and r/2r to mix them up. The rest is just gravy Laughing !


I would add some XOR's to that. But yeah with that alone you can already get a wide range of sounds Very Happy.

I wanted some more dividers/counters and was originally thinking of using a CD4520 dual 4-bit binary counter, but I went for a CD4029 instead. Besides
being able to count up and down it also has 4 preset inputs, which can be used as a digital 4-bit S&H. And with nothing connected to the inputs it works
as a reset. I just finished it (solder is stil hot Wink)


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PostPosted: Fri May 02, 2014 5:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

current status Cool


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modular lunetta (May, 3, 2014)
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PostPosted: Sat May 03, 2014 4:39 am    Post subject: Reply with quote  Mark this post and the followings unread

PHOBoS wrote:
...I would add some XOR's to that..... I went for a CD4029 instead


if you use a XNOR (4077) instead of the XOR(4077) and 4 diodes in wired-AND style you could probably us it as a logic comparator to generate a preset pulse. So you have 2 4bit inputs that define start & end value of the counter, right ? if this works, let us know. Smile

I use 4516 instead of 4029, because it has an extra reset pin.

have a nice solder weekend, u~
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PostPosted: Sat May 03, 2014 5:50 am    Post subject: Reply with quote  Mark this post and the followings unread

elektrouwe wrote:
if you use a XNOR (4077) instead of the XOR(4077) and 4 diodes in wired-AND style you could probably us it as a logic comparator to generate a preset pulse. So you have 2 4bit inputs that define start & end value of the counter, right ? if this works, let us know. Smile

scratch Shocked
yep I think that works. If you make two of those comparator circuits (I like them already) connected to a flipflop controlling the up/down pin you
should be able to make it bounce between 2 set points. I'll do some tests.

Quote:
I use 4516 instead of 4029, because it has an extra reset pin.

Wasn't familiar with that one, but just looked it up and it's actually a nicer version of the 4029. I don't really care for the DEC/BIN option and would
rather have a reset pin instead which is exactly what the 4516 has. Thanks for mentioning it Very Happy

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PostPosted: Sat May 03, 2014 2:06 pm    Post subject:   Reply with quote  Mark this post and the followings unread

posted a schematic here
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PostPosted: Wed May 07, 2014 5:21 am    Post subject: modular lunetta interface module
Subject description: 16 in/outs
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I made an interface module. I was originally thinking of adding 8 inputs with pulldow resistors and 8 outputs with LED's. But I might want to use it for
midicontrol to it in which case it would be nice to have 16 outputs. So I added pulldown resistors and a LEDs to every connection. As LED drivers I used
the ULN2804, which is a bit overkill but has a very practical pinlayout and 8 buffers so I only needed 2 chips.

The interface connector is a 25p sub-D connector with 2 pins removed so I can also plug in a 9p connector (8 in/out & -). The 25p connector has 3 pins
connected to + and 4 to -. One thing I'll probably make for it is a box with 16 1/4" connectors, 8 inputs with comparators and 8 buffered outputs.

edit: just found out that the extra mounting hole I added at the bottom doesn't line up with any of the holes in the mounting strip doh.
I could 'fix' it by hacking a piece of the strip and using 2 seperate nuts instead but I'll have to unscrew all the modules and remove the side from
the case to do that. And I first have to locate those nuts (if I have any left). It seems to be strong enough with out it so I could glue in a fake
screw instead (don't tell anybody).


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Modular Lunetta Interface module
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Modular Lunetta Interface module
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PostPosted: Wed May 07, 2014 10:46 am    Post subject: Reply with quote  Mark this post and the followings unread

Phobos, can you explan why you using the Diodes at the outputs of the shiftregisters and the counters. I use the diodes only at the input of the r2r ladders. I have some (odler) modules (like drumish sounds) that dont work with just a Voltage in, they need a change from low to high. Is this a pulldown resistor issue? (i dont have my hands a long time on this circuits..... i just patch them....)
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PostPosted: Wed May 07, 2014 11:22 am    Post subject: Reply with quote  Mark this post and the followings unread

I use the diodes on outputs so I can connect multiple signals to one input (it'll form an OR gate), so far I haven't really made a lot of use of that though.
And it can actually be a bit annoying sometimes when trying to connect it to something else, because you have to add a pulldown resistor. But the
interface module can take care of that. Cool

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PostPosted: Sat May 10, 2014 4:38 pm    Post subject: Modular lunetta dual mux module
Subject description: CD4052
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And another one finished, a 4052 dual mux. I added another mux that is just used as a bin2dec decoder to control the LED's. Since this is the same for
both halves (X,Y) I only used 4 LED's and mounted them between the X,Y in/outs.


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Modular Lunetta 4052 Dual Mux module
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Modular Lunetta 4052 Dual Mux module
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PostPosted: Mon Jun 23, 2014 4:14 am    Post subject: modular lunetta XNOR Comparator module
Subject description: 4 bit
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I have room for 3 more modules, 2 regular sized and 1 larger one the same size as the interface. I want to use the large one for a mixer so that
leaves me with 2 modules left. Some extra inverters are useful and some XOR gates aswell and if you make one input of an XOR high it functions
just like an inverter. But because I have diodes on all the outputs I can't use pullup resistors (the input would never go low). I could use a
patchcable though to make one input high if I want to use an XOR as an inverter.

But instead I choose to use XNOR gates, these work as an inverter when one input is low instead of high. And can be used like an XOR be it that
the output is inverted (I can invert it with a second XNOR gate to get a regular XOR). I also added diodes and a pullup resistor, buffered by a
transistor, as suggested by elektrouwe so the module also functions as a 4 bit digital comparator. Very Happy


modlun - 4077 XNOR comparator.gif
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Modular Lunetta 4077 XNOR Comparator schematic
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modlun - 4077 XNOR comparator.gif



modlunetta 4077 XNOR Comparator - 01.jpg
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Modular Lunetta - 4077 XNOR Comparator module
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modlunetta 4077 XNOR Comparator - 01.jpg



modlunetta 4077 XNOR Comparator - 02.jpg
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Modular Lunetta - 4077 XNOR Comparator module
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modlunetta 4077 XNOR Comparator - 02.jpg



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