NLC - Digital Filter Simulator - Build notes - part 1

 These are my build notes for the NLC Digital Filter Simulator.

 

It's a nonlinear circuits eurorack module.

12HP wide

It's mostly an analog circuit using CMOS and op-amps.

Audio is fed into a 4-bit A/D (analog to digital) converter section and then passed through shift registers.

 

It's then converted back to analog with a D/A (digital to analog) converter.

The output is then fed back into the input.

The module requires a clock.

You can also input CV instead of audio, to create interesting patterns.

 

 

 

Some more pics of the unpopulated PCBs

NLC words of wisdom

The 4015s

Mfr. Part No.

MC14015BDR2G

Description:Counter Shift Registers 3-18V Dual 4-Bit CMOS Static Shift

 

You need 2 of these.

It's the only CMOS section of the module.

The rest of the ICsare mainly op-amps

LL4148 diodes

The power rectifier (you can use a 10R resistor)... to protect the module if it's accidentlyplugged in backwards.

Get those 100k resistors on first.there are 36 of them.

Resistors marked 100k* on the input and output stages can be adjusted for better balance between inverted and non-inverted signals, try 51k. 

The two 470k* on the bottom PCB can also be adjusted to a lower value to get these stages hotter in the mix. They will cause the module to lock up at some settings and you will need to adjust the Range pot to suit, no biggie, nothing gets hurt. 

I'm using a 4.7K resistor for the RL  

To be continued...

Part 2 is here:

Digital Filter Build - NLC - Part 2

Links

+ NLC Wiki

+ NLC official BOM and build guide

+ youtube

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You can find more NLC builds here.

http://djjondent.blogspot.com.au/2015/03/non-linear-circuits-ncl-index.html

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