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 Forum index » DIY Hardware and Software » Stickney Synthyards
What's he building in there ?
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PHOBoS



Joined: Jan 14, 2010
Posts: 3869
Location: Moon Base
Audio files: 574

PostPosted: Tue May 10, 2016 5:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

Razz Thanks guys!


So what's in the Asylum ?
starting on he bottom row from left to right:
- Chromatic Melody Generator. The SAW output is connected to the mixer, so now you know what that was doing on the inputs/mixer panel.
- Skrogger. Indicated with the little sheep on the panel. I guess it's a bit of an inside joke and for the same reason I used the blue wooly fabric, but I am pretty sure Dave will appreciate it Laughing
- Bay-B-Key. Indicated by the yellow with red stripes and small colored keyboard.

In the center on top of the Skrogger my:
- Yellow Case PWM Lunetta. It is connected to the internal mixer but because it already has it's own build in stereo mixer there are no seperate level/pan controls for it.
and next to it on top of the Bay-B-Key:
- Lun-A-Key. Indicated by the light blue with small white keyboard.

Then there are two towers on either side with some lunetta modules. These where originally CD storage systems in which I
mounted some wooden rails and I used some thick solid core copper wire to create some busbars for power distribution.
On the left side from top to bottom:
- Master Clock Divider.
- Fibonacci Sequence Generator.
- Morse Code Generator.

The Master Clock Divider and The Morse Code Generator where originally mounted in the other tower but I wanted them on the left side.
Because the CD storage systems have some inwards sloped sides (which are now top and bottom since I put them on there sides)
and the Master Clock Divider module has a rather large PCB mounted on the top I had to leave some space above it for another module.

On the right side from top to bottom:
- Double Pulse Swing Divider. (2x)
- 4089 Rhythm Generator.
- 8bit random generator.
- "Little gate" Sequencer.

And the centrepiece is my:
- Modular Lunetta. This one also has it's own little mixer so doesn't have seperate level/pan controls.
(there are 2 panels on both sides of it but I will explain some more about that tomorrow)

And located on the top on the left side:
- RGB Shroom Synth.
and on the right side:
- RGB Shroom Drums.
Outputs of both of these are also connected to the mixer.


And here are some more photos.


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Cfish



Joined: Feb 24, 2016
Posts: 451
Location: Indiana

PostPosted: Tue May 10, 2016 6:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

Really love how you did this project. Was a lot of fun. Turned out beautiful.

you should do a YouTube video with that. Seeing and hearing it made me think of this video (A profectionist at work)

https://youtu.be/IvUU8joBb1Q
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AlanP



Joined: Mar 11, 2014
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PostPosted: Tue May 10, 2016 10:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

Brilliant execution, both in end result, and playing with the forumites! Smile
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RingMad



Joined: Jan 15, 2011
Posts: 349
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PostPosted: Wed May 11, 2016 3:06 am    Post subject: Reply with quote  Mark this post and the followings unread

Meh... there's no swimming pool.


Hahaha, no, seriously... a great bit of engineering and construction of a PHOBoPHOniC meta-synth!

Thanks for the fun ride.

.:James:.

P.S. What are the approximate dimensions of this thing?
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PHOBoS



Joined: Jan 14, 2010
Posts: 3869
Location: Moon Base
Audio files: 574

PostPosted: Wed May 11, 2016 8:52 am    Post subject: Reply with quote  Mark this post and the followings unread

Cfish wrote:
you should do a YouTube video with that. Seeing and hearing it made me think of this video (A profectionist at work)

https://youtu.be/IvUU8joBb1Q

that's incredible, almost looks and sounds to good to be true. But the prologue and how it works videos were interesting
and explain some things.


RingMad wrote:
P.S. What are the approximate dimensions of this thing?

Width = 82cm
Depth = 45cm
Height = 57cm + 19cm for the ' interdimensional portals'

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Skrog Productions



Joined: Jan 07, 2009
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PostPosted: Wed May 11, 2016 10:37 am    Post subject: Reply with quote  Mark this post and the followings unread

FANTASTIC Very Happy

Great work Phobos , i can see this appearing on the summer solstice gig and more Smile .

Heheheh , sheep panel legend , Very Happy

Nice blue lining too Wink

Dave

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PHOBoS



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PostPosted: Wed May 11, 2016 11:06 am    Post subject: Reply with quote  Mark this post and the followings unread

POWERSUPPLY

The main transformer I used was something I got many years ago but I don't have any info on it, or if I do I don't know where it is.
It has a lot of connections (on 2 sides) so I started measuring all the different voltages between them. For a stable 12V DC voltage
I'd need about 12VAC and I found 12,6VAC between two of the connections, they also had the thickest wires attached to them.
To be sure it would be able to supply enough current I attached a low resistance high wattage resistor and measured the voltage to
see if it would drop. It didn't seem to drop at all so those are the connections I used. Although the total power consumption isn't
very high all the digital circuits can be rather noisy, so for that reason I used 5 seperate 12V voltage regulators (the amount I had left).
fun fact: I ordered 10m cable to make the power connections and used all of it.

I wanted to use a seperate transformer winding for the Console Light (there where more than enough anyway) so I looked for another
suitable voltage. I found two sets of connections but one of those dropped to 0V when I attached a resistor to it, the other one seemed
stable and gave an output voltage of 8.75VAC which results in 10V DC. For the Console Light dimmer I used a variable current source
using a circuit I found here. The LED I used is a Nichia NSDL570GS-K1 which is a warm white (2700K) 23lm 140º 5mm LED with a current
rating of 70mA (but I stayed a bit below that). The light is not as warm as I had hoped it would be but it is bright enough.

For the mixer section I wanted a dual supply and I used a seperate transformer. I had a salvaged one that has an output voltage
of 2x 10VAC and by using some adjustable regulators turned it into a nice dual 9V supply.

Both transformers are connected to 1 switch and 1 protective fuse, but I noticed they also both have a built in thermal fuse.


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"My perf, it's full of holes!"
http://phobos.000space.com/
SoundCloud BandCamp AcidTrasH Stickney Synthyards
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PHOBoS



Joined: Jan 14, 2010
Posts: 3869
Location: Moon Base
Audio files: 574

PostPosted: Wed May 11, 2016 12:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

SIDEPANELS



so what are the 2 panels next to the modular lunetta for ?
The left one holds the console light and the dimmer for it.
Below that are the connections for the RGB Shroom Synth:
- Data in
- CLK in
- Audio (square) out
- Data out
- CLK out
And below that are the 4 Note Select connections for the Chromatic Melody Generator, so that I don't need to run patch cables
all the way down to it, although I still can.

The right panel has a wooden dowel rod to store headphones or patchcables.
Below that are the connections for the RGB Shroom Drums:
- Data in
- CLK in
- High Bongo trigger in
- Low Tom trigger in
- Bass Drum trigger in
And below that the 3 Octave Select inputs for the Chromatic Melody Generator + the square output.

The other 10 colored connections on both panels are for what I call "The Rainbow Bridge" and they are just connected together to
make patching between the left and right side easier.

I mounted a 9p Sub-D connector on the Chromatic Melody Generator to make all the connections and for the RGB Shrooms I used
M3 solder tags. All the wiring is guided through some plastic tubing which was a bit of a challenge by itself.


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PHOBoS



Joined: Jan 14, 2010
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Audio files: 574

PostPosted: Wed May 11, 2016 5:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

robsol wrote:
The sounds were great too. Moar please! Very Happy

ok geek

(the background noise you can clearly hear at the beginning was somehow added by my computer during recording, the output of the mixer is actually very clean)


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Last edited by PHOBoS on Wed May 11, 2016 7:29 pm; edited 1 time in total
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Cfish



Joined: Feb 24, 2016
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PostPosted: Wed May 11, 2016 5:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

Very cool.
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Blue Hell
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PostPosted: Thu May 12, 2016 2:37 am    Post subject: Reply with quote  Mark this post and the followings unread

Nice summer track :-)
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Grumble



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PostPosted: Thu May 12, 2016 3:00 am    Post subject: Reply with quote  Mark this post and the followings unread

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

Rolling Eyes Laughing
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MusicMan11712



Joined: Aug 08, 2009
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PostPosted: Thu May 12, 2016 8:22 am    Post subject: Reply with quote  Mark this post and the followings unread

Very nice Kolorful Kaleidoscopic Kaliope music!
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1:11



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PostPosted: Thu May 12, 2016 3:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

Shocked OMG Shocked
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robsol
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PostPosted: Thu May 12, 2016 4:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

Amazing track! Love it!! Very Happy
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PHOBoS



Joined: Jan 14, 2010
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PostPosted: Mon May 16, 2016 3:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks guys Razz

You are all an inspiration to me and although I built it for myself to play with it wouldn't be so much fun without you!




MIXER

The mixer has 9 inputs: 6 of them are mono channels with panning and level control, 2 of them are stereo channels without any controls
and there is one input that can be used both as a stereo or mono input with level control.

All the inputs have AC coupling and a preset level control because there is some variation between the levels of the different synths.
They are also buffered to get a stable signal for the rest of the mixer circuit. I used NE5534 low noise opamps because I had a bunch
of those which I got years ago but never used. I did some calculations for the panning section and if I did them correct than it should
be -3dB at 50% ('constant power' law). It also adds a log responce to the Level pot.

The level/panning control inverts the signal which is needed for the summing mixer so for the other 3 channels I added an inverting
amplifier. The 11K resistors parallel to the level pot of the mono/stereo channel are added to give it a log responce as well. The mixer
itself is just a basic summing amp. I used the 16K resistors because I had ordered 100 of them for the panning section.

After the mixer the signal is split 4 ways:
- the main output which has level control and output buffers.
- the monitor output which has output buffers but no level control.
- the VU meters.
- the Headphones amplifier.

For the VU meters I did some calculation to get close to the levels of -10dB (consumer line level), 0dB, +4dB (pro line level)
and clipping at 7.5V. The headphones amplifier is pretty much the ciruit that I found here, but with less gain and only
one (stereo) output.

Although the stereo/mono in/outputs work fine I realized too late that because I combined mono with the Left channel and Stereo
with the Right channel the channels are reversed when using a stereo (TRS) connector.


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_________________
"My perf, it's full of holes!"
http://phobos.000space.com/
SoundCloud BandCamp AcidTrasH Stickney Synthyards
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AlanP



Joined: Mar 11, 2014
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PostPosted: Mon May 16, 2016 10:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

Careful not to clip your alligator clips onto your mixer pots!
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