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. _________________ Esoteric drones and nonlinear distortion
Custom/handmade experimental instruments
macumbista.net
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.
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.
Joined: Nov 10, 2011 Posts: 878 Location: Lancashire, England
Audio files: 14
Posted: Wed Jan 22, 2014 3:11 pm Post subject:
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. _________________ As a mad scientist I am ruled by the dictum of science: "I could be wrong about this but lets find out"
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..
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! _________________ www.dogenigt.com
Everything should be made as simple as possible, but no simpler. - Albert Einstein
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.
Joined: Feb 09, 2012 Posts: 17 Location: 3rd from the sun
Posted: Sun May 04, 2014 11:20 am Post subject:
I've been lurking an learning here for a very long time, thank you all for sharing so much
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
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.
Posted: Thu Jul 10, 2014 7:22 pm Post subject:
Here's what I got...
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:
448 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.
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. _________________ Jan
also .. could someone please turn down the thermostat a bit.
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?
Posted: Fri Jul 11, 2014 10:13 am Post subject:
Rate multipliers
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!
Posted: Fri Jul 11, 2014 10:21 am Post subject:
Re: Here's what I got...
PHOBoS wrote:
very nice, and it looks like a useful collection of circuits you got in there.
chuck stephens wrote:
I used 4" PVC fence posts cut down to size as my panels"
that's an excellent idea!
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.
hi i'm new here. going to start building a modular lunetta soon once some more CMOS chips and more banana jacks come in...hopefully next week.
i'm going to have tons of questions and probably bug all of you.
textual wrote:
been a while since I began this guy.. its been done though since May.
textual wrote:
Thanks for the comments, here is a recording from recent.. [url][/url][/code]
this is beautiful build and patch in the soundcloud link textual. i would love for an overlay graphic with text over each module, as I begin to pick what modules i want to end up making. i have 13 pages of lunetta forum to scour. there's so much on here!
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