Some notes to build a simple sequencer for the AE modular.
I started building a simple GATE sequencer then turned it into a melodic one.
This is my 3rd AE modular project ... the first was a LPG followed by a series of clock sources and LFOs
this project uses the CMOS CD4017 chip.
Its a 10 step counter.
The AE modular uses +5V so its perfect
The 4017 has 10 outputs that go high everytime the clock input receives a gate/trigger.
Use something like a pulse from a LFO.
The outs are labelled 0 to 9
12 = carry out
this “carries out” the clock input to an additional counter
13 = clock enable
When it is “0” logic, the clock will get enabled, and the
counter advances one count for each clock pulse. But when “1” logic,
the clock input is stopped, and the counter will do nothing even
when a clock pulse arrives.
14 = clock in
15= clock reset
Normally, it is “0” logic.
When made “1” logic, the counter is reset to “0”.
16 = power (+3V to +15V
8 = gnd
---------------
Pins 13 and 15 must be connected.
They can't be left floating.
Connect these to ground (with pull down 100k resistors).
Parts
+ CD4017
+ 100k resistor x 2 - for pins 13 & 15
+1N4148 diode to protect the clock input and allow only +ve voltages to pass into the chip.
+ use between 1K & 10K resistors to protect the LEDs from burning out.
------------------------------------
I built the sequencer on the same board that I was using for the 6 LFOs
The LFO on the right is the clock source.
Its plugged into Pin 14 of the 4017.
Pins 13 and 15 must be connected.
They can't be left floating. This is very impt !!!!
Connect these to ground (with pull down 100k resistors).
Initially I just connected the outputs of the pots (pin 2) to a mult.
and then connected this to the VCOs CV input.
Seems to work OK but its actually a bit shoddy as current can flow back into the pot and interfere with the other outs. The fix is of course to add some diodes.
Choice of chip driving the LED vs Transistor.
Transistor is preferable since there is less load on the IC.
Use a 1k resistor and a NPN trannie ... 2n3094
One final thing, .... buffer the output with an op-amp
I'll use a TL 072
-------------------------------
Alternatives of 4017 are as follows:
IC-4060 — 14-Stage Ripple-Carry Counters/Dividers with Oscillators
IC-4020 — Binary Ripple Counter/Dividers, 14-Stage with oscillators
IC-4040 — 12-Stage Ripple-Carry Counters/Dividers
IC-4022 — Divide by 8 Counter IC
------------
to be continued....................