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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
New CMOS experiments - "TOUCH TONES" - touch harmony organ
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Joined: Feb 02, 2010
Posts: 249
Location: California

PostPosted: Wed May 22, 2019 12:07 pm    Post subject: New CMOS experiments - "TOUCH TONES" - touch harmony organ Reply with quote  Mark this post and the followings unread

This is two 40106 oscillators, with frequencies switched to harmonically tuned notes (roots and thirds) via 4051 1 of 8 switches. 4040 provides divisions for lower octaves. Not shown in the video, but I also added a 4070 faux ring modulator, cross modulating the two tuned 40106 oscillators, for extra fun.


I came up with a basic 40106 touch sensor circuit using 3 inverter gates, which I am still refining a little bit for reliability (I found it works better when my feet are on the concrete floor of my workshop, even with shoes on! so it is probably a grounding contact issue). Can post a schem if anyone is interested in that part.

The signals are gated with a two diode "VCA" for each octave with a square gate from each touch switch. One thing I am getting that I am not crazy about is a big pop when switching those VCAs on, and another when switched off (positive spike at the start, negative spike at release). I'm going to try resistors between the touch gates and the VCA CV inputs, as right now it's just straight from the 40106 outs.



The touch plates are just a temporary test thing, and you can see below that I've cleaned them up a little bit. Once I get all the kinks worked out, this will eventually go into some sort of pretty looking box for use as a performance device.


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Last edited by Top Top on Fri Jun 07, 2019 4:06 pm; edited 1 time in total
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dougseidel



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PostPosted: Thu May 23, 2019 5:03 am    Post subject: Reply with quote  Mark this post and the followings unread

that's great! i like the clicky attack also.
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Joined: Feb 02, 2010
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PostPosted: Sun May 26, 2019 4:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

dougseidel wrote:
that's great! i like the clicky attack also.


Thanks.

I actually like the sound of the clicky attack as it comes across in that video, but it got a bit much with lots of fast key action. It also sounds worse direct than through a mic like in the video.

I refined the touch sensor a little by adding ground contact, and eliminated the click for the most part by putting a 10k resistor between the gate output and the "VCA" CV input. Oddly, that also brought up the level of the audio from the oscillators and dividers. I have a bit to understand about how those two diode VCAs are actually working I guess.

This video shows off the ring mod, which the other video didn't show.


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PostPosted: Thu Jun 06, 2019 4:15 pm    Post subject: Reply with quote  Mark this post and the followings unread



Needs some cosmetic work, but functionally functional.

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Grumble



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PostPosted: Thu Jun 06, 2019 11:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

Nice Laughing
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AlanP



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PostPosted: Fri Jun 07, 2019 3:06 am    Post subject: Reply with quote  Mark this post and the followings unread

Oh wow, that looks fun Smile your left hand changed what key your right hand was playing?
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PostPosted: Fri Jun 07, 2019 11:32 am    Post subject: Reply with quote  Mark this post and the followings unread

AlanP wrote:
Oh wow, that looks fun Smile your left hand changed what key your right hand was playing?



Yes, left hand basically selects a chord position, 1 through 8 (combo of two tuned notes) using 3 bit selection, and the right hand gates what octave(s) of those two notes will sound.

If you think of it like a guitar (sort of), left hand selects chord position and right plucks the appropriate strings.

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PostPosted: Fri Jun 07, 2019 4:02 pm    Post subject: Reply with quote  Mark this post and the followings unread



Here is the same tune/pattern with some automatic accompaniment provided by another synth I built called the "Harmony Oracle." There's more about that in the thread about the "Melody Oracle" as well as the communication protocol that I use to get them to play together. ( http://electro-music.com/forum/topic-68735.html )

It is all CMOS logic gates and triggers, run in parallel, 3 bit for note selection, 3 bit for octave selection. Triggers for playing the harmony auto-accompaniment (set on the harmony oracle) can come from any of the pads, but are set in this video to come from two of them on the right hand.

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mike page



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PostPosted: Sun Sep 01, 2019 11:58 am    Post subject: Reply with quote  Mark this post and the followings unread

nice! would love to see a schematic Razz
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