My science fair synth project
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karl welty
Sep 14, 2016, 5:53:36 PM9/14/16
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A first test flight of all the major components. Sequencer,
Synchronously Controlled Oscillator and Filter. The neon logic board
(NE-2's) routes controllable voltages to a master oscillator which
drives the synchronous oscillator (XC-18). The passive filter has
frequency and resonance controls. The range is well over several
octaves and the device can be adjusted to musical relevance in tuning
and intervals, and a myriad of patterns and cyclic variations. Proof
of concept, now to study its behaviour before building a larger one
and bask just a little. Also... since it doesnt come with an owners
manual I am still learning my way around the controls, but am very
glad I put all those potentials for variation in the build.
https://youtu.be/XTTd_fAIayQ
Synchronously Controlled Oscillator and Filter. The neon logic board
(NE-2's) routes controllable voltages to a master oscillator which
drives the synchronous oscillator (XC-18). The passive filter has
frequency and resonance controls. The range is well over several
octaves and the device can be adjusted to musical relevance in tuning
and intervals, and a myriad of patterns and cyclic variations. Proof
of concept, now to study its behaviour before building a larger one
and bask just a little. Also... since it doesnt come with an owners
manual I am still learning my way around the controls, but am very
glad I put all those potentials for variation in the build.
https://youtu.be/XTTd_fAIayQ
Dylan Distasio
Sep 14, 2016, 7:07:21 PM9/14/16
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I love it! Can you share any documentation on it?
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karl welty
Sep 14, 2016, 7:50:48 PM9/14/16
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Once I have some, absolutely. Currently its subsections on scraps of
paper. Nothing in file formats I can post yet. The "computomatic"
schematic covers the basis of the switching system, the master vco is
my own adaptation of an OpAmp circuit, and the XC-18 portion is a
circuit I put together a few months ago. Lemme see... there were also
alot of mods and added functions from switches and pots, when I pull
all that together I'll try and post some of that too. The XC18 circuit
may look familiar, as I stole a transistor circuit and applied it.
paper. Nothing in file formats I can post yet. The "computomatic"
schematic covers the basis of the switching system, the master vco is
my own adaptation of an OpAmp circuit, and the XC-18 portion is a
circuit I put together a few months ago. Lemme see... there were also
alot of mods and added functions from switches and pots, when I pull
all that together I'll try and post some of that too. The XC18 circuit
may look familiar, as I stole a transistor circuit and applied it.
Dylan Distasio
Sep 15, 2016, 5:20:34 PM9/15/16
to neoni...@googlegroups.com
Thanks!
On Sep 15, 2016 5:15 PM, "karl welty" <toa3...@gmail.com> wrote:
The most recently updated docs for the XC18 circuit.
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karl welty
Sep 26, 2016, 1:10:41 AM9/26/16
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@Dylan - This video gives more of a peek at the things, from barely
working to functional. The video description goes into more detail
about the circuit. Youtube length restrictions on the description
forced me to edit the text, lemme know and I can email the full text
to you or post it.
Lots of sound samples along the way as well.
https://youtu.be/K-f_d1ayj0A
@Grahame Marsh - I have been going back over your rather detailed PDF
on the trigger tube clock, as well as the J B Dance info. Downloaded
the stuff over a year ago, making much more sense these days. The
split resistors after the cathode are really rather critical, as I now
see and have more personal experience hands-on with the circuits. That
voltage divider is really keen.
Also of note is the enclosed rather stunningly clever patent document
from 1938. Negative bias to the grid, or in this case trigger input.
My head is spinning and various bits are starting to assemble into a
clearer picture, though not quite all clear and focused yet.
Been a good weekend for wrapping my head around stuff.
working to functional. The video description goes into more detail
about the circuit. Youtube length restrictions on the description
forced me to edit the text, lemme know and I can email the full text
to you or post it.
Lots of sound samples along the way as well.
https://youtu.be/K-f_d1ayj0A
@Grahame Marsh - I have been going back over your rather detailed PDF
on the trigger tube clock, as well as the J B Dance info. Downloaded
the stuff over a year ago, making much more sense these days. The
split resistors after the cathode are really rather critical, as I now
see and have more personal experience hands-on with the circuits. That
voltage divider is really keen.
Also of note is the enclosed rather stunningly clever patent document
from 1938. Negative bias to the grid, or in this case trigger input.
My head is spinning and various bits are starting to assemble into a
clearer picture, though not quite all clear and focused yet.
Been a good weekend for wrapping my head around stuff.
Grahame
Sep 27, 2016, 9:53:16 AM9/27/16
to neoni...@googlegroups.com
Karl,
Don't be tempted to build a clock based on the XC18 tube as it will
prove very unreliable in the dark.
Nowadays I use the Z700U trigger tube as it has a primer electrode so
works in the dark. Plenty available from a UK seller.
Grahame
Don't be tempted to build a clock based on the XC18 tube as it will
prove very unreliable in the dark.
Nowadays I use the Z700U trigger tube as it has a primer electrode so
works in the dark. Plenty available from a UK seller.
Grahame
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