Suitcase lunetta tour/AD generator

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

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).

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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?

020_1.mp3

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