intellijel designs Plog User Manual

Plog rev 1.0 MANUAL

Plog rev 1.0 MANUAL

Overview

The Intellijel Plog is a voltage controllable digital logic
device designed for musical applications. It is primar­ily intended to create controllable patterns from gate/
pulse sources like clocks and sequencers.
It has many other applications other than to simply
mutate drum patterns. What you will use it for is up to
your imagination!
It contains four major blocks of logical operations.
These blocks are normalled in such a way that all the
blocks can be used together with minimal patching.
The Plog comprises two - triple input boolean logic

sections (with CV over type), a toggle ip op and a
data ip op.
The Toggle ip op can also be turned into a tap

tempo clock source.
The normals of the Plog can all be broken via the
switching jacks or in the case of theToggle input by a
jumper on the rear panel.
The Plog has been realized with a micro controller
that allows us to have features such as CV over logic
type and memory recall of initial logic state. The digi­tal design of the Plog also means it is very shallow
behind the panel.

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Plog rev 1.0 MANUAL

Front Panel

1 - TYPE (LOAD)

This button selects the logic type for the
selected channel, A or B. It also acts as
the starting point when under CV con­trol. Press and hold this button for one
second to load the stored preset from
memory.

2 - These two mini knobs attenuate the
CV coming into their respective CV in­puts labeled Type A and Type B.

3 - Type A/B bipolar CV input for logic
type of channel A/B. You will see the
logic type LEDs move when CV is pres­ent and SELECT is on A/B.

4 - X Input X for logic operator

5 - Y Input Y for logic operator

6 - Z Input Z for logic operator.

This is a switching jack with Input Y nor­malled to it unless patched.

The X and Y inputs for Logic block A are
normalled to the X and Y inputs of B.

7- OUT A /B is the output of the logic
operation.

8 - SELECT (SAVE)

Pressing this button selects between
logic A or B for the display of the yellow

LED logic type and the operation of the TYPE button. Pressing and holding this button for more than
one second will save the logic type selections into non-volatile memory.

9- TRIGGER button is normalled to the TOGGLE input below. When pressed it will send a trigger

to the toggle ip op. Press and hold on this button for one second and it will become a simple tap

tempo clk generator. Once in TAP MODE, start clicking the button in time with the tempo you would
like to set. To return to T-Flip-Flop mode simply hold the same button again for 1 second.

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Plog rev 1.0 MANUAL

Front Panel - cont’d

A - TOGGLE input to the toggle ip op. The TRIGGER button is normalled to this input with a

switching jack.

NOTE: There is a jumper on the back of the Plog module that connects the output of logic B to the
normalled input of T.

B - OUT T this is the output of the toggle ip-op. If in tap tempo mode this becomes the tempo

clock output (unipolar square pulses)

C - CLK clock input to the data ip-op. OUT T is normalled to here with a switching jack.

D - DATA data input to the data ip-op

E - OUT D output of the data ip op

NOTE: All of the logic and trigger inputs are expecting 0-5V signals (i.e. logic level pulses/gates/
clks). However the inputs all have negative and over voltage protection. Also each input employs
a comparator with a threshold of approximately 3V. This means you can still use non-square wave
signal sources as long as they exceed the comparator threshold (i.e. the positive excursion of a
triangle wave from a VCO/LFO).

Boolean Logic Blocks

The PLOG contains two - three input Boolean logic processing blocks. These are fundamental
building blocks of all logic systems and you are encouraged to check out some of the many excel­lent tutorials available on the web.

Althought the logic blocks are three input, the third input (Input Z) is normalled to the second input
(input Y). This allows for a the three input devices to behave like two input logic devices if you only
use the X and Y inputs. Also the X and Y inputs of logic block B are normalled to the X and Y inputs
of logic block A. This creates the option to generate outputs from two logic blocks at the same time
with only one pair of inputs.

The truth tables for operating each of the logic blocks as a three input or two input device are in the
diagrams below. On this module a logic input of 0V or GND is the equivalent of a logic LOW or ‘0’
on the truth table.
An input of 5V is the equivalent of a logic HIGH or ‘1’ on the truth table.

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