Wednesday, 8 October 2014

A visit to Non Linear Circuits - Perth, Western Australia

While on a recent trip to Perth I dropped by to visit my friend Andrew F of  Nonlinear Circuits.


I got to meet Pinky :-)


This is "Synth Porn"

And even more famous than Pinky are Randy & Bill
Randy is on the left. Bill who is only 4 months old is on the right.



Back to the synths:
This is all Eurorack format, consisting of :
2 tri-core VCOs 
2 LFOs 
2 LPGs 
3 VCAs 
VC spring reverb 
diff-rectifier 
jerkoff chaos 
2x  Buchla inspired 281 EGs 
Sauce of Unce (SOU). Based on the Buchla 265
A new NLC Serge format Panel.

This comprises:
Two VCOs
diff-rectifier 
Vibes (a collection of fixed filters) 
VCA
Mixer



This is part of an electronic analog computer which Andrew rescued many years ago.  It's programmed using patchcords that connect op-amps, capacitors, resistors, etc. to carry out calculations.



                                A adder circuit. It's a lovely illustration of how the Op amp's
                                    negative feedback can be used to do computations.

 This circuit adds the 3 inputs.
Vout = -R4[V1/R1+V2/R2+V3/R3]


                                                                     The integrator.
This op-amp circuit performs the mathematical operation of Integration. 


 The output voltage is proportional to the integral of the input voltage. (ie: the size of the output is controlled by the length of time a voltage is present at its input). This is determined by the negative feedback capacitor which charges/discharges.


I'm not sure of the age of this computer. Maybe 1950s /  1960's ????
It's beautiful though. 



 Pieter Brugel-the-elder, "The Triumph of Death"

  c. 1562. The original can be found in the Museo del Prado, Madrid 

Skeletons hauling a wagon full of skulls.
Death is indiscriminate. We will all have to face it one day.

An early valve synth



All pics are reproduced with the kind permission of NLCs.

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