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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
An A4 PCB covered in lunetta circuits
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mike page



Joined: Sep 26, 2016
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Location: norwich, uk

PostPosted: Wed Feb 01, 2017 3:50 am    Post subject: Reply with quote  Mark this post and the followings unread

PHOBoS wrote:
yes that works. However don't use resistors to mix, but diodes like it is done in the baby 10.
Posted Image, might have been reduced in size. Click Image to view fullscreen.


out of interest why diodes rather than resistors?
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PHOBoS



Joined: Jan 14, 2010
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PostPosted: Wed Feb 01, 2017 9:00 am    Post subject: Reply with quote  Mark this post and the followings unread

If you use resistors you create a voltage divider since all the outputs that aren't 'active' will be low so pretty much 0V.
(even if the outputs of the chip would be floating you'd still have the pots connected to GND) By using diodes you will
block these and only the voltage from the active output will end up on the output.

If you ignore the pots and just connect the outputs together by 100K resistors and the voltage is 12V than you have
1 100K resistor connected to 12V and 9 resistors in parallel (11.1K) conected to 0V. this means that the output voltage
would only be 1.2V. With pots it gets a bit more complicated because all the resistors are variable.

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mike page



Joined: Sep 26, 2016
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Location: norwich, uk

PostPosted: Wed Feb 01, 2017 10:26 am    Post subject: Reply with quote  Mark this post and the followings unread

Thats what i was thinking. I guess I was just thinking about how audio is passively mixed
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mike page



Joined: Sep 26, 2016
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PostPosted: Mon Mar 20, 2017 10:53 am    Post subject: Reply with quote  Mark this post and the followings unread

Here is a video of it pretty much finished :

https://vimeo.com/209123093
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Grumble



Joined: Nov 23, 2015
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PostPosted: Mon Mar 20, 2017 12:56 pm    Post subject: Reply with quote  Mark this post and the followings unread

interresting! Rolling Eyes
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synaesthesia



Joined: May 27, 2014
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PostPosted: Tue Mar 21, 2017 11:23 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Mike, that looks and sounds fantastic! Do you use additional external oscillators or is everything generated on the board?
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PHOBoS



Joined: Jan 14, 2010
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PostPosted: Tue Mar 21, 2017 2:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

you've done a great job on that, it came out very nice!
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mike page



Joined: Sep 26, 2016
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PostPosted: Sat Mar 25, 2017 1:45 am    Post subject: Reply with quote  Mark this post and the followings unread

thanks guys, its mostly 4 of those R2R steppy triangle oscillators. The top board is a bunch of modules designed by peter edwards (casperelectronics), the signal is going through the vcf then into that electro harmonix pedal that is giving the droney reverb noise.

As always as soon as its done an improved design is starting to take shape in my mind...

If I make a video describing all the functions i'll post it here Smile
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droffset



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PostPosted: Mon May 01, 2017 2:56 am    Post subject: Reply with quote  Mark this post and the followings unread

Hello!
That looks really amazing, congrats. Smile

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Check out the FREE Intro to Lunettas Document
https://docs.google.com/Doc?docid=0AZIwOP-PR9sSZDlidzgzbV8wY3RjenJqanY&hl=en

Edit: Spelling mistakes.
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tjookum



Joined: May 25, 2010
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PostPosted: Mon May 08, 2017 12:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

Rolling Eyes it's been a while..

Really nice work mike page! I think the artistic flowing style really suits the lunetta design. I have tried something along those lines a few years ago but never got around to finishing it. Your machine is looking great, I would love to see a more detailed overview. Here are some things I picked up on my failed attempt, maybe they are of use to you.

I used the cheap uninsulated 4mm banana sockets or eBay special ones with the plastic removed straight through the pcb, with or without soldering. And to keep it nice and cheap I used 16mm pots mounted through the pcb with the pins soldered to pads on the bottom. One of the reasons it never really got off the ground was probably the well known feature creep Laughing . I never seemed to be able to cram enough in and outputs into a reasonable space. I need my 4040 with Blinky lights Very Happy .

Basically it boiled down to cost per connection, 4mm banana's are a way better connector but header pins are just so cheap small and convenient Embarassed

The other thing I was limited by was board space, I was planning on getting them made in china. They generally charge double or more for the bigger sizes. Really good job on the A4 home-made pcb's, any more info on your methods?

Twisted Evil how many header pin lunetta circuits would fit on 1 A4 of copper clad....

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mike page



Joined: Sep 26, 2016
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PostPosted: Mon May 29, 2017 1:24 am    Post subject: Reply with quote  Mark this post and the followings unread

Heya. Yeah I find the spraypaint-lasercutter PCB process really effective and fun to do.

I use emachineshop free software to design DXFs

Then spray paint a piece of copper clad board (Ive found bits of A4 for £2 a pop on aliexpress)

Then I use the laser cutter where I work to cut the DXF line into the layer of spray paint (acrylic engrave settings are appropriate)

Next scrub it gently with a green scourer until the gaps in the paint are shiny copper

Then dunk it in ferric chloride, and leave it and agitating it and examining it. Sometimes it helps to give it a quick wash to examine it properly as the ferric chloride is dark. If you hold the board up to a light source you can see clearly where the copper has been removed.

Thats it really, it takes a bit of practice getting the laser settings just right and the amount of spray paint but its not difficult. Its good to get everything setup before you begin somewhere with a tap. Obviously be careful with Ferric Chloride! Wear rubber gloves and goggles and wash your hand thoroughly and regularly whilst working. It will eat through clothing too so best to wear an apron also.

heres a video of it bleeping :

https://www.instagram.com/p/BUCX4xAF0SB/?taken-by=bastlinstruments&hl=en
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mike page



Joined: Sep 26, 2016
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PostPosted: Mon May 29, 2017 2:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

i made a whacker out of a HD for it today too : https://vimeo.com/219427829
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MusicMan11712



Joined: Aug 08, 2009
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Location: Out scouting . . .

PostPosted: Mon May 29, 2017 4:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

mike page wrote:
i made a whacker out of a HD for it today too :
I love the use of the HDD. Wild!
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dougseidel



Joined: Feb 10, 2010
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Location: NJ

PostPosted: Tue May 30, 2017 5:37 am    Post subject: Reply with quote  Mark this post and the followings unread

Mike: that wacker is fantastic - a great drummer and looks good too.
Thanks for showing and i want to hear more music from it

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mosc
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PostPosted: Wed May 31, 2017 1:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

Congrats, Mike. Brilliant. Keep posting those videos.
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Top Top



Joined: Feb 02, 2010
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PostPosted: Thu Jun 22, 2017 10:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

Just noticing this project. Interesting to see someone else planning on magnets for patching!

Would love to hear more in action.

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mike page



Joined: Sep 26, 2016
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PostPosted: Fri Aug 04, 2017 10:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

my lunetta talking to my tricked out ciat lonbarde gerrasic organ...

GERASSIC from michael page on Vimeo.

[/code]
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stolenfat



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PostPosted: Sun Aug 06, 2017 2:32 am    Post subject: Reply with quote  Mark this post and the followings unread

very cool!

Is there a filter in there or maybe an adsr?

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mike page



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PostPosted: Sun Aug 06, 2017 1:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

the gerassic organ makes sort of plucked tones with clever simple triangles through a simple clever transistor vca. thats going into a resonant filter with the cutoff frequency being sequenced in time with the note trigger data. Oh also the decay of the vca is being poked at to vary the note sustain a bit.
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Blue Hell
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PostPosted: Mon Aug 07, 2017 5:03 am    Post subject: Reply with quote  Mark this post and the followings unread

Very nice organ!
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mosc
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PostPosted: Sat Aug 19, 2017 1:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yup, I like it.
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mike page



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PostPosted: Sun Oct 29, 2017 6:13 am    Post subject: Reply with quote  Mark this post and the followings unread

here is a recording of a nice patch on my lunetta. Im also using an autotune pedal make the notes nicer, a resonant filter and EHX super ego pedal to do the sustained notes:

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PHOBoS



Joined: Jan 14, 2010
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PostPosted: Wed Nov 01, 2017 8:21 am    Post subject: Reply with quote  Mark this post and the followings unread

nice one Very Happy
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mike page



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PostPosted: Thu Feb 08, 2018 1:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

Another jam on my lunetta with an autotune pedal and ehx super ego

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PostPosted: Fri Feb 09, 2018 8:23 am    Post subject: Reply with quote  Mark this post and the followings unread

Cool builds! They look and sound great.
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