Friday 16 February 2024

NLC - This 2 shall pass - passive analogue XOR - build notes


These are my build notes for the Nonlinear Circuits "This 2 shall pass" module
It's a eurorack format 2HP module.


Should be a simple build ... It's a passive analogue XOR circuit

No CMOS ... which is different & nice to see.
How to build a logic gate with transistors is a basic circuit which is a handy piece of knowledge.



There are 2 ways to use this:
1. If you want to get close to XOR behaviour, use the top and bottom inputs, leave the middle one empty. 
2. if you want a voltage controlled “XOR”  feed your signals to the top and bottom
     inputs and a CV signal to the middle input.



Feed it anything: CV, audio rate, gates, mix them up. Generally with audio signals it sounds like a Ring Modulator, adding CV to the middle input (but feel free to experiment) it sounds like a VC Ring Modulator.

Links
+ BOM

XOR Gate (Exclusive OR gate)
Will only output a high signal when one input is high and the other is low.
It allows the signals to pass Except when they happen simultaneously.
It's like when 2 people try to squeeze through a narrow door at the same time.
(use this for your two snare drums - to prevent them triggering simultaneously)




 In1 In2 Out
 0         0 0
01 1
 1 0 1
 1 1 0


......
Parts:
1k 2 0805
4k7 6 aka 4.7k 0805
22k 2 0805
BC847 6 sot23-3
3.5MM SOCKET 8 Tayda: A-2563



The red tape is to prevent any shorts



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You can find more NLC builds here.
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