Tuesday, 11 July 2017

NLC 32:1 - build notes

This is a Driscoll/Warren Burt inspired Eurorack module.

I am lucky to have the original Driscoll module on which this is based
so am keen to compare the two.

 The 32:1 can split 1 input into 32 outputs or vice versa.

This uses two CMOS analog multiplexers.
Mouser Part No:
A multiplexer is a device that can select from several different input signals
and transmit either one or more output signals
The DG506B is a 16-channel single-ended analog multiplexer designed to
connect one of sixteen inputs to a common output as
determined by a 4-bit binary address (A0, A1, A2, A3).

It also uses two CMOS up/down counters.
Mouser Part No:

 The CD4029 is a presettable up/down counter which counts in either binary or decade mode depending on the voltage level applied at binary/decade input.
When binary/decade is at logical ``1'', the counter counts in binary, otherwise it counts in decade. Similarly, the counter counts up when the up/down input is at logical ``1'' and vice versa.

The inputs consist of a clock (15), Carry In (5), Binary Decade (9), UpDown(10), Preset Enable(1)
and 4 individual jam signals.
The outputs : Q1,Q2,Q3,Q4 and a Carry Out (7).

 Some NLC words of wisdom.
PCB 1.
I accidently removed a trace from thr PCB connecting to one of the multiplexers. Thus the addition of that green wire.

The second mistake I made was adding the jacks before putting on the headers.

I used 1K LED resistors

"The LEDs count in binary, so just 5 of them...rather than 32".
I'm guessing they count from Zero to 31 ??
Decimal "32" is Binary "100000".................to display this would require 6 LEDs
 To convert decimal 32 to binary is easy as 32 is already in the table.

I just confirmed with Andrew F that the module does indeed count from 0-31.
"As the old joke goes : There are 10 kinds of people. Those who read binary, and those who don't"

* Build notes & BOM
* NLC Blog
* Youtube
You can find more NLC builds here.


  1. Hi Jon!

    I'm assembling one of these modules, but some specifications are missing from the PCB. Which kind of resistors are the two in the top-left corner of the 32B part?

    Also... I'm struggling to understand what RL means.

    Thanks if you can help, keep up with your great blogposts!

    1. If you look closely at the PCB, it says 470R x 10.
      There are 8 directly above this. The other two are I think the ones you are referring to. RL = Resistor of the LED.
      Its value depends on the brightness of the LED you have chosen. Hope this helps. Jon