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.

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