Joined: Mar 20, 2012 Posts: 2177 Location: Chicago
Audio files: 16
Posted: Sat Jul 21, 2012 11:49 am Post subject:
I found a weird shaped surround sound speaker, stripped the cloth covering, and spray painted it. The crackling was accidental, but I decided I liked it so I didn't strip it and start over. I've tried to find more of this model speaker, but they can't seem to be found. In fact there was only this one at the thrift where I found it....
Hi there
Finished a mfos WSG build for a friend & added some mods.
i used a 9v battery tray / holder round the back for easy bat changing, i used Ray's cv & gate input mods from the mfos website , also put 2 lfo timing cap's on a dp/dt toggle switch to give high / low speeds.
I included a switch on each of the 4 oscs to select between external cv in / center off / osc master sweep dial , the osc sweep is really a pot voltage divider which sweeps any or all of the 4 oscs ( sounds good through a delay fx ) .
Squeezed into a 140mm x 170mm sloped project box.
Dave.
mfos wsg & mods.JPG
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Spent quite a bit of July working on this chopper with a student from Spain. He didn’t quite finish it… a problem if you’re a Spanish dude in your early 20’s with too many friends around I suppose. Synth building is a solitary pursuit. So consider this a work in progress.
Tech details: line input, mic input, 2 x line outputs, dual VCA, 2 x VCO, dual VC Slope, Utility LFO, DC Mixer, Steiner VC Filter, Wave Multiplier. All PCBs by Ken Stone/CGS. _________________ Esoteric drones and nonlinear distortion
Custom/handmade experimental instruments
macumbista.net Last edited by macumbista on Thu Aug 02, 2012 2:44 pm; edited 1 time in total
Oooof... just finished another one-off electronic sound box... this time, a customized version of my Spacial Percussionizer [ http://www3.bell.net/james.schid/schidlowsky_esb.html#spacialperc ] for a sound-maker friend. He wanted a grey box with 4-channel output instead of 2, as well as all the trigger and spatializing oscillators voltage controlled. The power jack & switch and output jacks are on the back side.
At the heart of it, a CMOS NAND gate “percussion”/noise generator with 4052 spatializers (with 4 positions per pair of channels), both of which Inventor came up with.
This was my biggest box project yet... in terms of number of chips and panel hardware. Each time I build something, I learn stuff, and still make new mistakes.
James.
Quad Spacial Percussionizer box3b-sm.jpg
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Joined: Nov 10, 2011 Posts: 878 Location: Lancashire, England
Audio files: 14
Posted: Thu Aug 02, 2012 2:33 pm Post subject:
sonicwarrior wrote:
@RingMad:
At first I thought that was a cake and got an appetite for it.
How did you even make that mistake!? In what way does that look like a cake!? _________________ As a mad scientist I am ruled by the dictum of science: "I could be wrong about this but lets find out"
Ha, good one Les, but the friend I built it for has it now and is working on a composition that will use it. I'm eager to hear what he will do with it, but also a little worried about if I messed up and it breaks down in the middle of the concert.
note the Extremely High Tech® pcb mounting method - it's a euro pcb, and has no conventional mounting holes, so I got these really cool nylon pcb mounting thingies, but the existing holes (borrowed from hardware I didn't use on the pcb) weren't big enough, so I had to X-acto the nylon grabber things down to a size that would fit, but then they wouldn't hold the pcb in all the needed directions, so I slapped a bit of super sexy cable tie around the whole mess. Problem solved.
I slapped a bit of super sexy cable tie around the whole mess. Problem solved.
Very nice. If you would have used just an ordinary cable tie instead of the super sexy one, the project would not be nearly as nice. _________________ --Howard
my music and other stuff
Joined: Sep 21, 2009 Posts: 122 Location: Bloomington, IN
Posted: Wed Aug 08, 2012 6:54 pm Post subject:
New proto-PCBs in for three new designs! I guess this isn't technically a build photo, but I'm just really excited to be getting new stuff done. I got them done by OSH Park and it was the fastest turnaround on protoPCBs I've had, and at a reasonable price.
Left is the Voltage To Rhythm converter. Center is a little utility module that's an attenuater/amplifier/offsetter with LEDs for indicating if you're over or under a certain voltage. Right is the rotating Track And Hold, which can also function as a standard sequential switch. I'll be writing more about these/gauging interest when I make sure I've got all the bugs out of the system.
Joined: Jan 14, 2010 Posts: 5591 Location: Moon Base
Audio files: 705
Posted: Thu Aug 09, 2012 2:21 pm Post subject:
ADRAIN 8 Subject description: vintage drumbox
While I was cleaning up a bit I stumbled on an old (1977) book I got some time ago, on how to
build your own electronic organ. The circuits are pretty outdated and all transistor based but
there's also a section in it with percussion circuits and from what I understand they are the
circuits from the Thomas Bandmaster.
So I breadboarded them and was pretty happy with the sound considering they are mostly very simple
1 transistor circuits. Most of them are actually exactly the same except for component values. The
brush cymbal, snaredrum and hi-hat also share a noise section and the snaredrum has an AMV for
drumrolls. I couldn't build the crash cymbal since it needs a 1H inductance, which is a bit hard
to find and expensive. I did get the right inductance for the brush cymbal (well almost). but
somehow it causes noise to bleed through without being triggered. So at the moment I have that
desoldered which makes it sound more similar to the snare/hi-hat.
(I might get that fixed somehow someday)
There wasn't really a hi-hat circuit in the book, so I adapted the crash cymbal circuit a bit for
that. Originaly the tone pots where trimpots parallel to a smaller resistor, so I increased the
resistance of those and added some real pots instead. I also added extra switchable caps to the
snare/brush/hi-hat for longer decay times, and changed some of the component values.
Each drumsound has a gain circuit added to get it to a decent line level and then goes to an
EFX S/R jack (shorted when nothing is plugged in). The snaredrum has this for both the snare and
drum section. After that the signals go through a level pot, pan pot and are mixed together.
(as a bonus I can also use it as just a mixer, by plugging something into the EFX Return)
The trigger inputs all have comparators and a simple on/off switch. The interface connector.
has all the 9 trigger inputs (8 sounds + drumroll) and power (2 pins for +12V, 1 pin for -12V,
and 3 pins for GND) It has a build in PSU and I put a XLR connector on the side with the RAW DC
voltage to power my other synths from it. So 'next' will be a controller, probably something PIC-
based or maybe pure CMOS. And I could also make a drumpad for it
For the case I used a vintage 70's breadbin (one of those eureka! shower moments).
O and did I mention that it has nice colorful LED's
so may I present to you:
ADRIAN 8
and for those wondering what ADRIAN might stand for (Analog, Drum, Interface, ehm,.. )
no, it doesn't mean anything (yet), but is a reference to Adrian from the movie Liquid Sky.
ok. let me shut up now and show you some pics and a demo:
(front is not fully attached yet with all the screws in case I need to change something)
ADRIAN8 - 01.jpg
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ADRIAN 8
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ADRIAN8 - 02.jpg
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Money shot
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ADRIAN8 - 03.jpg
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trigger section
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ADRIAN8 - 04.jpg
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some LED action
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wow , what a fantastic drum box, phobos , really well laid out and those s/r fx jacks are a great idea , did you have to put a stomp box level converter circuit in or are fx pedals ok with the instrument levels ? .
sounds great too , i was thinking Fad Gadget / the Normal , early mute records , Excellent build
Joined: Jan 14, 2010 Posts: 5591 Location: Moon Base
Audio files: 705
Posted: Sat Aug 11, 2012 6:42 am Post subject:
Thanks Howard, elmegil, Dave
Skrog Productions wrote:
..,did you have to put a stomp box level converter circuit in or are fx pedals ok with the instrument levels ?
I don't have any pedals myself only effects that are build for line level use so I adjusted it for that.
But if I'm correct most pedals have a input level attenuator so that should work. Actually I see them
being used for line level signals all the time _________________ "My perf, it's full of holes!" http://phobos.000space.com/ SoundCloudBandCampMixCloudStickney SynthyardsCaptain ColliderTwitchYouTube
Joined: Mar 20, 2012 Posts: 2177 Location: Chicago
Audio files: 16
Posted: Sat Aug 11, 2012 7:24 am Post subject:
El Cerrito
Here's my El Cerrito build, just finished. Working on VCA/VCF so I can actually "play" it, but I've messed around with it some and like it a lot so far.
Horizontal mounting is to help with my space constraints, I have a directive from above to keep myself within the space of a single shelf (which makes me consider switching to Euro format, but...I don't like little knobs and jacks, so not yet).
El Cerrito Panel.jpg
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El Cerrito Soldered.jpg
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El Cerrito Wired.jpg
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El Cerrito in context.jpg
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Quite a tricky build as this isnt from standard parts. Actually a present from my girlfriend and I built it quickly. I will post a link if anyone likes it. And sorry one picture is upside down
photo.JPG
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photo-1.JPG
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