Finally getting this Klee sequencer built.
The Klee sequencer is an exercise in the unpredictable.
It can be used just like a normal linear step sequencer but that would negate all the complicated circuitry inside.
Klee patterns are like "loose clay". That's one of the reasons for its name.
That, and I suspect it may also be in honor of the artist Paul Klee, who's abstract paintings reflect this unconventional type of programming.
I think I purchased the kit in 2016 but you can still buy these from Synthcube
This is Rev 1.22D
These are the virgin PCBs
It looks like one of the main differences between the Klee and a standard step sequencers is that the Klee can have more than one step running at a time.
You need to load the steps you wish to use. Loading just 1 step (actually a bit) will approximate a standard sequencer.
Links
The LED driver circuit
You can load up to 16 steps or bits before you run your sequence.
(You do this by flicking the switch above the step "up" and pressing the LOAD button).
The output voltage of each of these bits are added together.
There are 3 CV outputs:
CV A Output: The output voltage of all the steps in the "A"
section
CV B Output: the output of all the steps in the "B" section
CV A+B Output: the combined outputs of all the steps together
Getting back to the build:
Need 16 of these to match the sliders (8 on each side)
Slider LEDs in sync with bits:
Cut/strip the included purple wire
into the appropriate lengths and
place them into the Step spaces
The board is divided between digital and analog sections.
Start with the IC sockets
Analogue side first
25 x 100K resistors first.
R1 to R 25
They are all on the left of the board
These 100K resistors have a tolerance of 0.1%
These are involved in mixing the voltages from the programming pots.
Their tolerance will play a role in how accurately this is accomplished.
100ohm next
R49 to 57
Diodes
There are three varieties of diodes to deal with on the Analogue Board. The 1N4148
diodes could be substituted with 1N914 diodes. The 1N4001 could be substituted by any
other high power rectifier diode (such as 1N4002, etc). The BAT85 could be substituted
by any low voltage Schottky diode (such as a BAT42), but be very careful that it does not
exceed 400 mV at 10 mA.
There are 28 x 1n4148 signal diodes
D1-D28
UA78L10ACLP Voltage Regulator
The 1n4001 diode
Cap - Film Capacitors 63volts 0.33uF 5% - C9
Electrolytic Cap 4.7uF - C11, 12, C10 ??
The 104 caps - 0.1uF
There are 14 of these
I think these are just for decoupling
C1 - C8 & C13 to C18
Resistors
The default value for R33 is 1K – it is used if the standard 8V fixed range is selected as
the function of position 8 of the rotary Range Switch.
R33 is going to
determine the maximum voltage that can be “dialed in” with the Variable Range Control.
100K OHM TRIMMER POTENTIOMETER CERMET 25 TURNS
3296W
These are marked 104
R42, R43
Range Switch Position / Maximum Pot Range Voltage/Interval (V/Oct)
1 0.333V, Major 3rd Interval
2 0.4167V, Perfect 4th Interval
3 0.583V, Perfect 5th Interval
4 0.666V, Minor 6th Interval
5 1V, One Octave
6 2V, Two Octaves
7 4V, Four Octaves
8 8V, Eight Octaves
Fortunately, these values are adjustable using the trim pots.
With the standard values,
ranges 1 through 3 are adjustable from 0V through 0.625V.
Range 4 is adjustable
through 1.28V with the standard values.
Ranges 5 through seven are adjustable through
5V
Range 8 is adjustable through 8.1V.
If one changes any
of the divider resistor values for these ranges (R26 through R33),
it is possible to exceed
these ranges.
BAT85 Diode -- D30
D30
provides protection from any negative voltages that may be applied to the External
Variable Range jack. This jack directly feeds the input of U7, which is a CD4051. The
CD4051 cannot accept a voltage lower than 0.5V below its supply rail. D30 is a BAT85
Schottky diode that will prevent voltages 0.4V below ground from being applied to U7.
These 8 trimmers are marked 103
10K Vertical 20 Turn 3296W
Their designators are R34 to R41
These 10K trimmers are used for calibration of the Range Switch voltages.
The trim pot on the bottom left (R41) in the pic needs to be removed.
So really you only need to install 7 of these
Some notes re the GATE BUS
As I'm building this kit, im reading the manual..... so this may change as I learn more.
Please shoot me an email if i'm in error.
It seems that the gate switches work on a similar principle to the CV section.
There are 3 gates/triggers which trigger when the switches for each step are in the up position...
ie when the steps are illuminated.
Gate bus 1 corresponds to sequence A
Gate Bus 3 corresponds to sequence B
Gate bus 2 is kind of a merge of both sequencers.
The centre gate bus 2 is a logical NOR function of Bus 1 and Bus 3.
That is, it will only trigger if bus 1 & bus 3 don't trigger (light up).
To be continued .......
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