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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Suitcase lunetta tour/AD generator
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heim



Joined: May 13, 2018
Posts: 1
Location: City
Audio files: 1

PostPosted: Sun May 13, 2018 11:49 am    Post subject: Suitcase lunetta tour/AD generator Reply with quote  Mark this post and the followings unread

Hello,

I've been reading this forum for around a year and built my lunetta with your help, however I never got around to registering and posting something. Sooo, here's the suitcase lunetta, audio sample attached (EQ and a bit of reverb added).

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

I don't have exact schematics for it, but here are the resources I've used to build it, hope it will be useful to someone.

1) 4067 based 16 step sequencer.
Mostly relied on this schematic but used 4067 instead of 4051: https://hackaday.com/2015/02/23/logic-noise-the-switching-sequencer/. The outputs from 4040 to 4067 can be patched. Also there is a clock output to drive the second sequencer or something else. For 40106 range 20K pots and 1uF caps were used, it sounds a bit nicer that way.

2) 4051 based 8 step sequencer.
Same as 1)

3) Passive 6 channel mixer.
Nothing special about this one, just pots to output

4) 4 octave synth with vibrato
Pretty much relied on this schematic: http://www.electro-music.com/forum/topic-45583.html. Used 4068 instead of diodes to form AND gates. I recall reading somewhere that diode AND gates might be a bit unstable. For vibrato more simple circuit was used - filtered 40106 square wave to resemble a sine instead of generating an actual sine

5) 40106 x 6 oscillators
Just simple oscillators. 3 x audio range and 3 x LFO

6) R-2R ladder
Used this website to build it:http://castlerocktronics.com/modular.html. I thought that it could make cool waveshapes, but after building it I discovered that it does divides the frequency greatly, but it can be used to drive a VCO or modulate oscillators/sequencers.

7) 4015 shift register
Wires hooked up to an IC

Cool 4040 dividers
Wires hooked up to an IC

9) 4093 NAND gate
Wires hooked up to an IC

10) 4070 XOR gate
Wires hooked up to an IC

11) Audio to logic
This one is quite interesting. Got the idea from https://www.parasitstudio.se/building-blog/cmos-workshop-part-2-square-wave-fuzz. It amplifies signals to logic levels and the cleans up the wave with 40106.

12) 40106 x 6 oscillators
Same as 5) but added option to modulate the waves through a cap or a pot. There's a nice video about it on youtube: https://www.youtube.com/watch?v=FaoJaLmZaL4

Found another suitcase near the dumpster outside my house, so I'll make another one Very Happy

The actual question I have is regarding attack/decay generation for a sequencer. It has a clock output, so I think I could use it as gate/trigger (I still don't fully understand this) for VCA, but the schematics are a bit too difficult for me. Are there any resources for this or simpler schematics?


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Steveg



Joined: Apr 23, 2015
Posts: 98
Location: Perth, Australia

PostPosted: Sun May 13, 2018 4:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

Well done. A very nice machine.
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PHOBoS



Joined: Jan 14, 2010
Posts: 4089
Location: Moon Base
Audio files: 605

PostPosted: Mon May 14, 2018 10:25 am    Post subject: Reply with quote  Mark this post and the followings unread

Excellent build with a nice selection of modules. I like that you put a 4 octave synth with so many buttons in there. Laughing
Your post gave me a boost to continue with my own lunetta in a suitcase.

Quote:
The actual question I have is regarding attack/decay generation for a sequencer. It has a clock output, so I think I could use it as gate/trigger (I still don't fully understand this) for VCA, but the schematics are a bit too difficult for me. Are there any resources for this or simpler schematics?

Do I understand it correct that you want to use an AD generator + a VCA clocked by the sequencer ?
If you a refering to the sequencer from hackaday than you can use any output from the 4040 but most likely
you want to use output Q4, at least if you connected it in the same way.

If you only want to use squarewaves the VCA part can be very simple and an AD generator can be built easy too with a 555.

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mosc
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Joined: Jan 31, 2003
Posts: 17894
Location: Allentown, PA
Audio files: 146
G2 patch files: 60

PostPosted: Mon May 14, 2018 11:15 am    Post subject: Reply with quote  Mark this post and the followings unread

Very nice Lunetta. Congratulations...

I like the sound of your sample recording too.

Thanks for finally signing up and posting. welcome

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hexagon5un



Joined: Apr 10, 2009
Posts: 37
Location: Munich, Germany
Audio files: 1

PostPosted: Tue May 15, 2018 1:52 am    Post subject: Reply with quote  Mark this post and the followings unread

Fantastic work!
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