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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Let's see your Lunetta!
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commathe



Joined: Jul 26, 2013
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PostPosted: Sun Aug 25, 2013 6:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

Noob question: What is with the external ground connections I keep seeing on a lot of people's output mixers?
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macumbista



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PostPosted: Mon Aug 26, 2013 4:18 am    Post subject: Reply with quote  Mark this post and the followings unread

commathe wrote:
Noob question: What is with the external ground connections I keep seeing on a lot of people's output mixers?


It's a good question to ask! If you have a coupe different cases, run on a couple different power supplies, you would need to connect their grounds together somehow in order for them to pass signals between each other.

If both cases are connected to the same audio mixer via a grounded jack cable, for example, problem solved. However, maybe one case doesn't have jack outputs, perhaps because it's only a sequencer without audio output. Dedicated ground connections would be handy in such a situation.

This is pretty much a banana-specific thing, EuroRack and other formats solve it by (redundantly) grounding every single cable.

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commathe



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PostPosted: Mon Aug 26, 2013 6:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

Fantastic! I had been really confused about this but it now makes so much sense. I was just seeing a jack that had nothing it could connect to and getting confused but I didn't think about having more than one modular playing nice together.
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granoj



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PostPosted: Wed Aug 28, 2013 5:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

this is so EPIC, love the use of piezos
sndbyte wrote:
There is no amp in this video, just 2 piezo discs, so use headphones.

2 LFOs made with a 4069 CMOS IC. One is driving a photocell which is connected to a 40106 oscillator. This is then gated using a 4066 CMOS analogue switching IC (the other LFO is controlling the gate). The output is then sent to 2 piezo discs which is why the volume is so low.

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Dogenigt



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PostPosted: Thu Jan 16, 2014 7:17 am    Post subject: Reply with quote  Mark this post and the followings unread

ARISTOTELES - work in progress. more to come in near future at www.dogenigt.com

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

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PHOBoS



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PostPosted: Thu Jan 16, 2014 8:28 am    Post subject: Reply with quote  Mark this post and the followings unread

looks great Very Happy
I like the combination of the type of knobs, banana jacks and those lovely red pushbuttons you used.

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JingleJoe



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PostPosted: Wed Jan 22, 2014 3:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

I have an observation of a problem I would like to share: this thread is depriving this forum of lots of new topics, the very lifeblood of a forum, because the purpose of the lunetta forum is basically to see your lunettas.
The above lunetta-synth is a perfect example, it could have it's own thread with lots of discussion about the circuits, which would be more easy to find but instead it's hidden away in this thread, much harder to find than a dedicated topic an as such it'll probably go unseen by many who'd like to see it.
TL;DR this thread is pointless because one of the purposes of the already existing lunetta forum, is to show people your lunetta.

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wackelpeter



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PostPosted: Thu Mar 20, 2014 11:53 am    Post subject: Reply with quote  Mark this post and the followings unread

well this is nothing special just a 4093 schmitt Trigger giving the main clock signal then divided via 4024 and then several Outputs fed into another schmitt trigger again to trigger my ms20, 2 other outputs into an 4030 OR gate feeding with its output together with a divided sequence of the clock a 3rd schmitt trigger thus controlling the LPF and and other divided clock signal controlling the HPF...

makes a nice and cheap (3-4 Euro for electronic components, the pot is the most "expensive" component there) pattern Generator... then with a second clock input things become more chaotic... i'm thinking of building this into a box and keeping it almost patchable including spdt to bybass one source on the schmitt Triggers Inputs...

another nice thing would be converting these signals to triangle or ramp for filter Controlling...

here's a short sample...
simply White noise & squarwave... other Outputs could also control the s&h function... no effects and sorry for the bad Quality it's recorded through the microphone input of my laptop..


cmos_0.mp3
 Description:
simple cmos pattern generator

Download
 Filename:  cmos_0.mp3
 Filesize:  1.75 MB
 Downloaded:  85 Time(s)


cmos2_0.mp3
 Description:
another sample of this simple pattern generator

Download
 Filename:  cmos2_0.mp3
 Filesize:  1.34 MB
 Downloaded:  70 Time(s)

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Dogenigt



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PostPosted: Sun Apr 06, 2014 4:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

JingleJoe wrote:
I have an observation of a problem I would like to share: this thread is depriving this forum of lots of new topics, the very lifeblood of a forum, because the purpose of the lunetta forum is basically to see your lunettas.
The above lunetta-synth is a perfect example, it could have it's own thread with lots of discussion about the circuits, which would be more easy to find but instead it's hidden away in this thread, much harder to find than a dedicated topic an as such it'll probably go unseen by many who'd like to see it.
TL;DR this thread is pointless because one of the purposes of the already existing lunetta forum, is to show people your lunetta.


Sure, I'll definately give her a thread of her own she's done! Smile

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mosc
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PostPosted: Mon Apr 07, 2014 2:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

JingleJoe wrote:
I have an observation of a problem I would like to share: this thread is depriving this forum of lots of new topics, the very lifeblood of a forum, because the purpose of the lunetta forum is basically to see your lunettas.
The above lunetta-synth is a perfect example, it could have it's own thread with lots of discussion about the circuits, which would be more easy to find but instead it's hidden away in this thread, much harder to find than a dedicated topic an as such it'll probably go unseen by many who'd like to see it.
TL;DR this thread is pointless because one of the purposes of the already existing lunetta forum, is to show people your lunetta.


That's a great point! Closing the thread is probably not the best way to handle this problem. I suggest that people who post here do create another topic for their Lunettas. People that see an interesting Lunetta an request that a dedicated topic be posted with more details and the opportunity for more discussion.

Just my thoughts...

thanks

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transponderfish



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PostPosted: Sun May 04, 2014 11:20 am    Post subject: Reply with quote  Mark this post and the followings unread

I've been lurking an learning here for a very long time, thank you all for sharing so much Very Happy
At last, I have a device which qualifies as a Lunetta: built into an antique violin case (pre WW1, I guess). It is far, far away from being finished, but as you can hear and see, it can produce nasty noises Twisted Evil



You hear a 4093 quad NAND, a 40106, a 4011 Ring mod and a 4051 multiplexer through a mini-mixer, a 386 amp and an old car bass-speaker (the silver circle to the left).

I will open an own thread soon, for sharing my insights on the construction, my stripboard layouts and to ask you all these little questions. Smile
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mosc
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PostPosted: Mon May 05, 2014 12:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

transponderfish wrote:

At last, I have a device which qualifies as a Lunetta: built into an antique violin case (pre WW1, I guess).


I love it. Great idea...

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chuck stephens



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PostPosted: Thu Jul 10, 2014 7:22 pm    Post subject: Here's what I got... Reply with quote  Mark this post and the followings unread

Hey guys! I've been lurking here for the last year trying to wrap my head around all of this information. With lots of inspiration from this community I've finally built something that I'm somewhat satisfied with. I used 4" PVC fence posts cut down to size as my panels and the whole thing is built into a 12"x38" gun case. I don't have any pics up yet but I just finished a video to give you an idea of what it sounds like-

Here's what I've got-
3 frequency multipliers
3 dividers
12 switches
8 LFOs
6 inverters
1 multiplexer
2 slacker melody generators
2 8 bit shift registers
3 decade counters
2 4 bit optical DAC (LEDs spaced along the inside of a tube with photoresitors at each end)
2 6 bit DACs
6VCOs
1 atari punk console
2 FM VCOs
2 3 channel passive resistor mixers
1 4 channel active mixer/pre amp
1 quad NOR filter
4 1/4" in/out jacks
various logic gates
2 mini space rocker drum modules w/ DIY capacitor cartridges to change drum sounds
1 Arduino random drum generator (GASP! give me some slack- it's a stand in until I find a good cymbal and snare circuit)

I'm really into the idea of generative music and my Lunetta has made me very happy. It's my favorite thing I've ever built and I've built a lot of things!
Thanks to everyone here! You have answered questions you never heard me ask.


my lunetta.jpg
 Description:
Here's a pic of my Lunetta noise machine as of 7/14
 Filesize:  1.27 MB
 Viewed:  34 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

my lunetta.jpg


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Blue Hell
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PostPosted: Fri Jul 11, 2014 2:12 am    Post subject: Reply with quote  Mark this post and the followings unread

I've no idea what happened in the above post - bit it didnt like the vimeo bits very much, had to edit those out to get the text visible .. sorry for that.
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commathe



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PostPosted: Fri Jul 11, 2014 2:21 am    Post subject: Reply with quote  Mark this post and the followings unread

Awesome build! I like it a lot!
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synaesthesia



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PostPosted: Fri Jul 11, 2014 8:08 am    Post subject: Reply with quote  Mark this post and the followings unread

Wow! Very nice, makes me want to build one too. I like the way you used screws as connectors. I guess you connect those with alligator clips.
Reading through your list of ingredients, I see that you mention 3 frequency multipliers. Would you share how you built those?
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PHOBoS



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PostPosted: Fri Jul 11, 2014 8:53 am    Post subject: Re: Here's what I got... Reply with quote  Mark this post and the followings unread

very nice, and it looks like a useful collection of circuits you got in there. Very Happy

chuck stephens wrote:
I used 4" PVC fence posts cut down to size as my panels"

that's an excellent idea! Shocked

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chuck stephens



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PostPosted: Fri Jul 11, 2014 10:13 am    Post subject: Rate multipliers Reply with quote  Mark this post and the followings unread

I was having trouble getting the text body of my posts here to show up. Does this site not get along with Firefox?

synaesthesia wrote:
Wow! Very nice, makes me want to build one too. I like the way you used screws as connectors. I guess you connect those with alligator clips.
Reading through your list of ingredients, I see that you mention 3 frequency multipliers. Would you share how you built those?


Interesting story- I had no intention of using rate multipliers or even much of an idea of what they are. I ordered some 4572 hex gates from my distributor and they sent 4527 rate multipliers instead. When I notified the vendor they said to keep the multipliers and they'd send the hex gates ASAP. Not being one to let anything go to waste I downloaded the data sheet and was intrigued by the chip. It has a a clock input, 4 bit BCD input, an inhibit pin, a clock input and a standard and inverted output. It multiplies the clock input by 1/10th of the BCD input (by dividing by 1/10th it is actually a divider but who am I to quibble?). The interesting thing was the timing diagram. My initial plan was to use it as an arpeggio generator but it really shines when you input audio frequencies to the clock pin. It works in a similar fashion to the Slacker melody gen but with only one chip. I liked it so much I built three! The construction is basically pin to post with pull down resistors where appropriate.

PS After pricing banana plugs and jacks screw posts and alligator jumpers were a no brainer. I'm all about thrift!


cd4527be datasheet.pdf
 Description:
Check out the timing diagram.

Download
 Filename:  cd4527be datasheet.pdf
 Filesize:  421.45 KB
 Downloaded:  29 Time(s)


Last edited by chuck stephens on Fri Jul 11, 2014 10:23 am; edited 1 time in total
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chuck stephens



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PostPosted: Fri Jul 11, 2014 10:21 am    Post subject: Re: Here's what I got... Reply with quote  Mark this post and the followings unread

PHOBoS wrote:
very nice, and it looks like a useful collection of circuits you got in there. Very Happy

chuck stephens wrote:
I used 4" PVC fence posts cut down to size as my panels"

that's an excellent idea! Shocked


PVC fence posts are an awesome material! I use it to make project boxes. One 8 foot post makes 4"wide boxes at 8.5 cents per inch of length! I use scraps of Centra- a vinyl used in the sign industry- to make ends and thin plywood for the bottom. Super cheap and easy to cut, drill and customize.
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chuck stephens



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PostPosted: Fri Jul 11, 2014 11:01 am    Post subject: Audio Reply with quote  Mark this post and the followings unread

Let's try this in Explorer. Here's a video link-
http://vimeo.com/100467031
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chuck stephens



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PostPosted: Fri Jul 11, 2014 11:04 am    Post subject: And another Reply with quote  Mark this post and the followings unread

http://vimeo.com/100383138
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chuck stephens



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PostPosted: Fri Jul 11, 2014 11:10 am    Post subject: mp3 Reply with quote  Mark this post and the followings unread

OK let's try an mp3-


MAKESHIFTMORGUE.mp3
 Description:
Makeshift Morgue by nepchune

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 Filename:  MAKESHIFTMORGUE.mp3
 Filesize:  17.71 MB
 Downloaded:  33 Time(s)

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synaesthesia



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PostPosted: Fri Jul 11, 2014 1:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

Very nice. I didn't know the 4527 rate multiplier chip yet, but that's exactly what I needed. Added to my shopping list.
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Dogenigt



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PostPosted: Mon Jul 14, 2014 9:25 am    Post subject: Reply with quote  Mark this post and the followings unread

By request, I've made a dedicated topic of its own for my lunetta (WIP):
http://electro-music.com/forum/topic-62324.html

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

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