Tuesday, 18 December 2012

NoizeMaschin #18

A nice pic of my 3 panel NLC at NM#18.
Thanks Skot
Playing as part of noise supergroup Sub Ordnance

Sunday, 18 November 2012

board order

sent this off tonight.
note the power distro boards with space for Euro connectors.......Dan!
Also has more Korg 800dv ext input PCBs, dual VCA/panners, Envelope followers/LFOs and Vox filters/LFOs. I like LFOs.

Sunday, 11 November 2012

vocal filter

This board contains 4 LFOs, with individual and summed outputs. Plus a set of four parallel fixed and variable bandpass filters with VC Q and a VC notch filter to form a vocal effects animator. This was inpired by the Vocal Effects Waveform Animator in Electronotes, but has been changed to give more functions, use available smd ICs and to make it ridiculously complex. Each of the variable filters has an individual output, the filters are also summed and passed thru a notch filter to get the vocal effects.
The summed LFO outputs are all different, each draws the outputs of three of the four LFOs, so summed outs consist of signals from LFOs 123, 234, 341 & 124.

There is a spare OTA stage which I may implement as a VCA, but not sure if I can be bothered at this point. This design has taken nearly 3 months to complete.

It will take up 6 columns on a NLC panel, thankfully no wiring to do.

Friday, 9 November 2012

Neuron / Difference Rectifier PCBs

 AU$8 each (+ shipping AU$5 per order) 

From thread on muffwiggler:

I keep getting asked about these so have sent off a design for a pcb containing 1 of each of these circuits. 

The Difference Rectifier has 4 inputs (two + & two -) and two outputs. The Neuron has two inputs and one output. There is a pad labelled 'ext' where extra inputs can be added if desired (use a 100k resistor attached to the jack). 

All inputs for both circuits can be wired to attenuating pots if required. The two pots on the PCB are the critical Offset and Invert controls for the Neuron. The Offset is slightly modded from the previous Double Neuron PCB as it now ranges between +V and -V and its effect is halved by the 200k resistor to give greater useful range.
Schematics and demos - Difference Rectifier and Neuron

Build manual pdf 

The PCB is small so will suit Euro builders. Approx 1.5 by 2 inches.
The 2 board mounted pots (both 100k) are 1 inch apart, the idea is to mount the PCB to the panel with threaded pots. There are 2 mounting holes otherwise if you want to attach the board some other way.


Wednesday, 31 October 2012

new chaos circuit

Playing around with a new type of chaos circuit. It is an extension of the Muthuswamy/Chua 3 component chaos circuit (which has just an inductor, capacitor and a memristor). In this one I developed a circuit to mimic a complex memristive system. Whether it makes it into a synth module or not is uncertain, it needs five AD633s at $8 each. For now it is just some good pictures.

Friday, 26 October 2012

update from post on 28/4/2012:
 A utility PCB, no pots, just jacks. Moog fixed filters - brass, vibes, humana, funk, harpsichord another fixed parallel BP voice filter (called gargle).
 These can of course be used with any audio or noise source but are intended primarily as filters for the extra outputs on the Veena.

 Also has white noise, pink noise, random vibrato, slow random, chunder (roar), two difference rectifiers and a 4046 phase locked loop circuit.

 Somewhat pleased to find everything worked very nicely. I tweaked a couple of resistor values to get the white noise level off the rails and get the LED brighter and flashing more often. Otherwise it is fine.

One nice feature is to daisy chain the filters to get new sounds.
The 4046 PLL was a bit of a gamble but it sounds great, adds a bit of distortion and spits, screams and fizzes as it tries to track the incoming signal. I built the proto-type with nearly all ceramic caps, figuring that will be the worst it can sound, but it actually sounds good. the original Moog passive filters, that these are based on, were likely built with ceramics anyway.

Monday, 15 October 2012

Filter Panel

This one has
"it's 555..." resonator/drone/noise source with CV control of pulse width for all five stages (plus a CV all input)

"Bleeding Gates" VC Slew: double module each has three individual channels giving 6 in all.

"Double Jerkoff" two chaos generators based on Sprott's jerk circuit. Each has X, Y & Z outputs and inputs. the input signal can be used to get the outputs to sync (when it feels like it) with everything else

"Spam filter" transistor ladder VCF

VCF - filter based on Arp and Electronotes designs.

"Divine CMOS" sub-oscillator, harmonic divider/mixer, harmonic ring-modulator, pattern generator, sequencer....

The user manual can be found  HERE

 These bottom three vids are by Jono

Monday, 24 September 2012

CMOS panel

Ready to be shipped, these cost US$1200 btw, 6 left Contains Great Divide, 8 bit Cipher, 4X4 Logic, 4 stage sample & hold, 4 stage thru & hold, 2 Bi-directional switches, CMOSC - 12 oscillator drone module.
The user manual can be found HERE.
If you want to see some up-close shots of the panel and PCBs, have a look at this PDF

Friday, 14 September 2012


A new circuit to go into panel #7
blurb (from http://www.sdiy.org/pinky/data/arseq.html) - This circuit is quite simple but an excellent envelope generator.
It has a counter, four attack release generators (ARgen) and a mixer.
It was originally intended to be a sequencer with controllable slew on each stage,
but it only took an extra pot and two diodes on each stage to turn it into what it is now.
The ARgen circuit is pretty common, I have seen at least 6 variations of the circuit around the net.
Most likely it evolved from the old diode function generators of analogue computer days.

Each stage takes two clock signals, the 1st starts the attack slope.
If the slope is steep enough the output will reach the sustain value set by the level pot for that stage.
The next clock signal puts that stage into release mode and the output starts to drop.
The 3rd clock signal starts the attack on the next stage, if the previous is still 'releasing'
the signals from each stage will sum in the output mixer.

LEDs indicate the envelope of each stage, so more than one LED may be lit at once,
indicating the output signal is a mix of two or maybe more stages.

Thursday, 28 June 2012

a demo showing how the jerkoff responds to different inputs. The X, Y & Z outputs are all shown responding to a variety of square wave, sawtooth and gate inputs. The input level, jerk and wiggle pots are all adjusted to demonstrate the different signals this circuit produces. The 'jerk' and 'wiggle' stages of each cycle are easy to recognise in the final section of the vid, when the 'scope is set to X-Y mode. The size of the jerk is controlled by the jerk pot and the degree of wiggle is controlled by ......

Saturday, 5 May 2012

filter and CMOS panels in

just picked these up yesterday
the metal fab place did the holes too small on the double CMOSC oscillators, so will drill them out. At least they didn't do them too large. Otherwise another fantastic job by Print N Etch - http://www.printnetch.com.au/

Saturday, 28 April 2012

kind of a utility PCB, no pots, just jacks.
Moog fixed filters - brass, vibes, humana, funk, harpsichord
another fixed parallel BP voice filter (called gargle)
These can of course be used with any audio or noise source but are intended primarily as filters for the extra outputs on the Veena.
Also has white noise, pink noise, random vibrato, slow random, chunder (roar)
2X difference rectifiers
4046 phase locked loop circuit

Friday, 27 April 2012

difference rectifier

this circuit is very simple, just one op amp stage, but when fed 2-4 CV signals it produces a wonderful array of complex envelopes. In the vid, the blue and yellow traces are the inputs, the pink one is the output. It starts off fast but slows down after a minute, so it is easier to see what the cct is doing.

Monday, 30 January 2012

Flamingo Situation A - live at Noize maschin!! Artifactory

thanks to Skot for recording
Sam for mastering

Monday, 23 January 2012

thru&hold sample&hold bidirectional switch

This module has 10 circuits: 4 thru&hold, 4 sample&hold and two bidirectional switches.
The thru&H and S&H all work off the same CV signals (or noise or whatever else applied to the input) but each stage is independently gate controlled.
The bidirectional switches are, of course, inspired by the early Serge modules of the same name and have the same functionality. Either feed an input signal and use a gate to choose whether the input goes to output A or B, or feed two input signals into A and B, then use a gate to decide which gets fed to the output. This design differs from the Serge (which uses 4007 CMOS) as it uses DG411 analogue switches and can pass any signal between +/-12V. It can also operate at audio frequencies so some fun can be had using 3 audio signals to switch between each other.

Friday, 20 January 2012

Korg 800DV CV/gate mod PCBs - $20 including shipping

These PCBs are for Korg 800dv synths. Each has two CV channels and two gate channels, based on the schematics from e-lab. You only need one.

Check this thread on Muffs for more info