Saturday, 11 March 2017

Superbooth 17 Berlin 20-22 April

Nonlinearcircuits Null-A will be at Superbooth 17, Booth E273. The booth was booked by Gareth of Oscillosaurus, who kindly offered to share the space to help promote other Australian Eurorack manufacturers.



btw - cellF will be performing in Berlin on May 12, 13 at HKW

Friday, 10 March 2017

NULL-A................2



Null-A2 is an all-in-one analogue synth packed into 42HP. 
PCB set (2) - USD50
Panel - USD50 
'B-stock' aluminium panels with free scuff marks - USD40
Shipping for these will be USD20 (includes tracking & signed delivery)

I will start selling assembled units from late May, expect USD550.

It features:


2 VCOs
1 state variable VCF
1 ladder VCF
1 VC Delay
3 VCAs
2 LFOs
Mixer
Headphone amp
Sequencer
Clock Divider
Sample & Hold (S&H)
Sloth chaos generator


It does not feature MIDI, micro-processors or any software. 

Current draw:
+12V rail - 135mA
-12V rail - 90mA

There are several presets that run between the switches of the jacks. If you insert a patch-cable into either jack the preset is disconnected.



The interesting one is the signals from the Sequencer, Sloth chaos and Tri from LFO2 are mixed and fed to the S&H sample input. This means it is continually generating stepped and smooth CVs (for there is a Slew pot) that are different but related to everything else that is going on.

The Clock Divider gives divisions of /2, /8, /32 and /128. 

The Sequencer has 4 stages but the direction control can be used to make it count forwards and backwards enabling more complex sequences. In normal operation, the ‘x’ output gives the CV generated by the stages 1 thru to 4, meanwhile the ‘y’ output will give a CV signal generated by stages 4 thru to 1.

The VC Delay can be used to generate reverb type sounds but can also be pushed into making all sorts of unexpected zipper noises and effects when the Time and Feedback pots are turn high.

The third VCA is built into the input of the Ladder VCF. If nothing is patched into the ‘CV VCA’ input, the VCA is always on. 

The Sloth Chaos is a very slow CV generator, it can be used to liven up a patch and create slowly evolving sounds. It cannot be controlled, it does what it wants.

I have a batch of aluminium panels that have minor scratches or scuff marks on them, usually just a couple and not particularly bad, so these are available for USD40 until sold out. Please specify 'B-stock panel' when ordering.













Envelope Follower

This Envelope Follower PCB was developed for use in the cellF synth, it is based on the design in the Buchla Easel. Obviously it has a few changes; a gain pot rather than a hi/lo switch and a gate output. It is a wonderfully sensitive and expressive EF, that works nicely with regular microphones and guitars.
The 1/4" jack connects to the switch of the 3.5mm input jack, the outputs are pre-amp (20x gain), envelope and gate. The LED indicates when the gate is on.



PCB - USD8
Panels - USD20