This is my blog index for all things ARP
I'll try to keep this updated.
You can always find the link to this page on the right of the blog home page.. Under "Blog Index"
ARP as the master .
It sends a 8V clock.
The 1027 sequencer also outputs 10V pulses from the "position gates"
As a master its easy. esp with a modular synth like the TTSH or a 2600
This also works quite well with my eurorack.
Use the clock out.
It's a 8V pulse per step.
ARP as a slave.
I'm again using the ARPs clocked sequential module ... the 1027 .
It's a 10 position sequencer.
The step input.
Electrical specs:
According to the manual, the perfect input for step, repeat, on & off is +8.0V.
The 1027 sequencer however, outputs 10V pulses from the "position gates"
and the manual suggests connection the "s" input to the "position gates" ... so I think 10V pulses should be safe to use.
Another way to sequence the sequencer is via the "VC frequency".
... this controls the clock frequency
----------------------------------------------------
I've found 3 methods that work.
The first two use a clock signal that triggers the step input on the 2500.
So the ARP 2500 is the slave.
The first uses a Kenton Pro solo Mark 2
I used a Deluge as the master Midi module ... sending midi clock to the Pro solo.
The settings are as follows:
This also works for Buchla.
Method 2 Elektron Analog Keys.
The A4 should work the same.
Go into your global settings and set CV C or CV D to Clock.
If you only have a standard mono cable use CV C as this sends the clock to the tip.
(CV D sends it to the ring)
tHE length of the pluse can vary. My 2500 responds well to 24ms length, but its also ok up to 32.
8V pulses work fine. Probably 10V will be ok ??
These are my build notes for the nonlinearcircuits Dual LFO/VCO module.
Its Eurorack format.
These are the virgin PCBs
icS first
I'm waiting on some parts.
The LM13700 is a general purpose op-amp.
The DG202 is a CMOS switch. Its a quad SPST switch.
The DG 212 should also be ok to use.
The "DG " stands for double gate. Double Gate CMOS (DG)
Traditional CMOS technology is approaching physicial limitations was we approach the nanoscale regime.
One such solution is the double gate transistor, proposed in the 1980s.
"Multigate transistors are one of the several strategies being developed
by CMOS semiconductor manufacturers to create ever-smaller
microprocessors and memory cells, colloquially referred to as extending Moore's law."
If you don’t really care about 1V/oct tracking then you do not need
to install 1k tempcos but you must install the 1k 0805 resistors on the bottom side of the PCB.
the 3mm LEDs are bipolar. They are 2 pin.
If red/green use 1k for RL. If red/blue use 4k7 for RL
What is this?
It's a combination of 2 words .... Algorithm & Rave.
"An algorave is an event where people dance to music generated from algorithms, often using live coding techniques.Algoraves can include a range of styles, including a complex form of
minimal techno, and the movement has been described as a meeting point
of hacker philosophy, geek culture, and clubbing.
Although algorave musicians have been compared with DJs,they are in fact live musicians or improvisers, creating music live,
usually by writing or modifying code, rather than mixing recorded music."
(Wikipedia)
Basically, artists code live on computers.
The code produces music and controls visuals.
The visuals usually include the code itself, so the audience can see the music as it evolves and is written.
The software is free & opensource. Much of it will run on really basic computers (eg a raspberry pi ) making this form of music easily accessible to everyone.
Their logo is a Spirangle.
It's a cross between a triangle & a spiral.
Currently, there is live performance of artists coding and performing all around the world.
It's taking place today, March 20.
This is also known as the March Equinox ... actually it occured a 2.49pm in Australia.
This marks the arrival of Spring in the Northern Hemisphere & Autumn in the Southern.
with LEDs, usually this holds:
The square pad represents POSITIVE
The round pad represents NEGATIVE
Anode - positive, long lead
Cathode - flat side, short lead
The light dependent resistors
Tayda: A 1851 --- linear B 100K
Calibration:
The CV drive is an anti-log circuit, it works a little differently as
both the CV and phase pots must be adjusted to find the sweet spots.
If one of these pots is at zero, the other will not have any effect.
The In2 pot is 0 at centre, the incoming signal is inverted below that.
it is intended as a feedback input for one of the stage outputs, but
shove in whatever you want of course.
There are 2 trimpots .. feedback & range
"The 1M feedback trimpot pot should be set so the circuit just starts to scream when the panel pot is at max. This can vary a lot depending upon the signal source and its frequency.
Best to leave it in the middle to start and adjust if your module is too squeaky.
The 1M range trimpot sets the operating range for the CV and Phase panel
pots. Again leave it in the middle to start and adjust if you find the
panel pot operating range is t
oo narrow or wide. You may need to adjust
the 470k* resistor sitting next to the trimpot as well. Generally it is
Building the lyra is very different from what I'm used to.
It's a bit like soldering an SMD board with through hole parts.
The pots and switches are wired to pads, .... not into holes in the PCB as you would usually see if you were building a Eurorack module.
The separation of the synth into a control pcb & the main PCB should make trouble shooting easier. I first started connecting the pots to the PCB with left over resistor wire, but in hindsight, insulated wire would be better. ... less chance of shorts.
Lots of cleaning up to do post soldering.
This is the keyboard.
Closeup of the rear of the keyboard section.
Connecting the upper and lower boards.
I'm using insulated ribbon cable and making my own headers.
Make nine 12 pin ribbon cables.
and one 5 pin cable (for the in-out board.
Lot's and lots of wire stripping. :-)
There are 3 boards to connect ... don't forget the in - out board.
This connects in two spots . One to the main board, and another to the control / pot board.
tHE shields
tIME TO plug everything in
tHE in/out board connects to your DC power source
tHE case is a bit rough ... just some recycled timber.