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Repeater
Joined: Mar 19, 2011 Posts: 13 Location: Rochester
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Posted: Thu Aug 28, 2014 10:18 am Post subject:
Eunuch Selector and Touch Envelope |
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Hey there. I'm back to thinking about these sorts of circuits again after a long break and figured I'd share a schematic for something I was working on called the Eunuch Selector. I named it that because it has no knobs and makes arbitrary cuts. It is inspired by the Doepfer A-152, Ciat Lonbarde analog organs and my Skeevy family of random voltage generators.
It is a touch-controlled random signal router (analog multiplexer) and random CV generator. Flesh is used in place of clock signals. You touch the electrodes to make it scan. Sometimes it has stable resting states, other times it runs amok. Withholding coupling capacitors increases the erratic behavior. The CV generator is also clocked by one’s flesh and runs in parallel with the multiplexer. There is a ring of 6 LEDs that indicates the logic states of the innards. Read the notes on the schematic for some information about mods that can be done. Some applications may require adding buffers.
I'm interested in adding lots of touch control options to my hypothetical Lunetta, as this is something I don't see very often in these sorts of designs. Here's another Lunettaesque circuit (excuse the NPNs) along those lines that may prove useful to some of you:
Try 'em out. Let me know what you think. I'm hoping to resume work on my own Lunettaesque synth once I get back from tour so I'll be more active here soon. |
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PHOBoS
Joined: Jan 14, 2010 Posts: 5591 Location: Moon Base
Audio files: 705
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Posted: Thu Aug 28, 2014 10:58 am Post subject:
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nice, I've been thinking about some touch controlled circuits so this is inspirational
just one note, you don't need to use all the pulldown resistors.
They're only needed on inputs that are connected to a switch or connector or something else which can cause them to float.
If you want to make them low/high permanently you can just connect them directly to GND/Vcc. And there's no need for them
when an input is connected to an output either. So normally you'd have to use some pulldown resistors on the CLK inputs
in your circuit, but in this case that might work counteractive. _________________ "My perf, it's full of holes!"
http://phobos.000space.com/
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Repeater
Joined: Mar 19, 2011 Posts: 13 Location: Rochester
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Posted: Thu Aug 28, 2014 11:36 am Post subject:
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PHOBoS wrote: | just one note, you don't need to use all the pulldown resistors. |
You're right. The Eunuch Selector was part of a larger design and I leave pulldown/up resistors on most inputs out of habit in case I want to interrupt signal flow or add in logic from other places. |
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mike page
Joined: Sep 26, 2016 Posts: 134 Location: norwich, uk
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Posted: Thu Jul 06, 2017 2:14 pm Post subject:
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i like it |
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