Showing posts with label NonLinear Circuits. Show all posts
Showing posts with label NonLinear Circuits. Show all posts

Thursday, 16 July 2015

Korg KPR 77 Drum

The KPR stands for Korg Programmable Rhythm.
She came out in 1983 and was Korg's response to the Roland 606.

It's very underrated.  Each drum sound's level can be individual mixed via the sliders.
The sliders are just like the ones found on the Roland 707.
It's sounds consist of bass, snare, two toms, open and closed hi-hats, accent and (switchable) cymbal/clap.
The bassdrum is a bit weak in my opinion. The Toms aren't too bad.


Sadly no midi or DinSync- It's a Korg sync Korg uses a 48 ppqn (parts per quarter note) DIN standard whereas Roland's is 24 ppqn. For correct tempo match it is possible to use a clock synchronizer like the KMS-30 or an Arturia Beatstep pro.
- 2 trig outputs (pulses +5V)
- start-stop pedalswitch input
- sync IN / OUT
- tape interface - See more at: http://www.polynominal.com/korg-kpr77/#sthash.YA3fG1Gx.dpuf

Runs on 9V DC (original model KAAC 001) or 4 X 1.5V batteries

- tape interface  

Patterns can be saved to magnetic tape if you have to turn off the machine without batteries.


There is a large display: - used for programming like in the Roland 505 & 626.
There are 2 recording modes: realtime record or step.


There is a accent for each instrument.
We have flam repeats for tom1 & 2. There are also 4 different resolutions:
16th, 16th triplet, 32nd and 32nd triplet


The MEMORY has 48 basic rhythm patterns
- 32 steps for each pattern

There are 6 chain banks divided into Chains 1 & 2 & groups A, B, & C.


The Toms are also great triggers for analog gear. The 2 trig outputs are pulses of +5V ... so quite good for triggering EuroRack modules like envelope generators and Korg Volcas.

1 separate out for snare/claps channelThere is 1 separate out for snare/claps channel.

We also have a start-stop pedalswitch input.
There is 1 separate out for snare/claps channel
 start-stop pedal switch input
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For more info on the history of Korg Drum Machines Click Here

+ KORG KPR-77 Drum - getting started tutorial 

 

Wednesday, 15 July 2015

New Sound Waves - Sunday 12th July Meeting

I had the best Sunday ever.
Lot's of synths and good friends.
Above is a Buchla 200/ 200e - Thanks Paul.


 Monome + Euro = :-)

New Sound Waves live at 107 Projects,
Redfern St, Redfern. Sydney, Australia.
We all got to see  the new Roland AIRA Eurorack gear, thanks to Christian Moraga and Roland Australia.





These meetings  are held every 2 months (on average). Subscribe to the NSWaves blog for more details:

First pics of pluto

Oh Oh ........... :-(

Tuesday, 14 July 2015

Kilpatrick Phenol Synth - First Impressions

This just arrived yesterday. So I did a few quick videos
This second video uses a NLC (NonLinearCircuits) sequencer  - The Bibdubba 1 & 3.

The Phenol is a modular that punches well above it's weight,

 Andrew has done a great job.




The Synthacon - Steiner - Parker

On this page are my blog entries on all Steiner-Parker / Synthacon related subjects.

1. SYNTHACON VCF - CGS 35 build notes
2. Steiner-Parker MicroCon Voice - Eurorack - Build notes

   External Links  
1. Yu Synth VCF
2. Analogue Realities
Steiner Synthasystem DIY
4. The Synthesizer Network


Saturday, 11 July 2015

Buchla 100 - The Lost Frequencies

It's been over a year since the original recording.
Finally getting down to using some of those old Buchla 100 samples.

Some of the original samples were taken in this session.

The piano & drums are obviously sampled externally.

The bass lines are all Buchla 100 & 200.


Serge / NLC Modular - Die Blechtrommel

The tin drum takes its name from the 1959 novel by Günter Grass.


It's also the name given to a NLC drum module featured on this track.

Andrew F of NLC (NonLinearCircuits) tells me that this is based on a early Japanese drum module which he has modified. I think it sounds just awesome.

This minimal patch is self generating - I tweak here and there but if left alone for long enough, it will evolve into new patterns & melodies.

Some really beautiful sounds here. I don't think the video does this justice. I think I'll use some of these sounds in a future track.


Wednesday, 1 July 2015

Santiago de Cuba - Cuba Trip

The news today is all about the thawing of relations between the US & Cuba.
It's about time. I visited Cuba in 2010/11. Lovely people.

Santiago de Cuba was the fifth village founded by Spanish conquistador Diego Velázquez de Cuéllar on July 25, 1515.
The first cathedral was built in the city in 1528. From 1522 until 1589 Santiago was the capital of the Spanish colony of Cuba.

The city was plundered by French forces in 1553, and by British forces under Christopher Myngs in 1662.
Casa de Diego Velazquez - this is the oldest colonial house in Cuba & probably North America.
Address: Francisco Vicente Aguilera, Santiago de Cuba, Cuba
Dating from 1522 - it was the residence of the Island's first Govenor.

 Excellent Beer.

 Dance Classes :-)








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For more Travel Postcards Click Here
For more on Cuba Click Here

NLC JerkOff - Chaos Module - Build notes

This is a really cool chaos module & is super easy to build.  It uses chaotic oscillators based around Jerk Equations. It's a excellent source of CVs - for modulating & controlling filters, VCOs, mixing with envelopes, etc etc

Andrew's build notes for the single Jerkoff module are here:
http://www.sdiy.org/pinky/data/single%20JERKOFF.pdf
Build notes for the double JerkOff are here:
http://www.sdiy.org/pinky/data/DOUBLE%20JERKOFF.pdf

WAMOD - More Notes

Much of the original research & design was done by J. Sprott of the University of Michigan.
You can read his paper (in PDF format) here:
http://sprott.physics.wisc.edu/pubs/paper352.pdf

The circuit consists of two feedback loops. The first involving 3 integrators.
The second uses two integrators and a inverter/diode. (Intergrator's are common to analog computers)
I  understand this is described as a chaotic phase-shift oscillator ... consisting of an inverting amplifier (the 741 opamp??) with its output fed back to its input through a phase-shift network consisting of resistors and capacitors.

Here are some pics of the NonLinearCircuit PCB:
The circuit has 3 outputs: X, Y,  Z and 1 input ‘in’. 
Feeding it gates or triggers should get the output signals to sync with other modules.

Headers first:. Resistors & caps next
Andrew has left this module open to lots of experimentation. Above are the marked caps & resistors.

The rest of the component values are very much up to you to pick. I've decided to use 100K B pots.
It's recommended to use resistors with half the value of the pots.... thus 47K ohms are the closest.

These 3 caps are the ones you choose to set the base frequency. I've picked 1uF.
 The rest of the caps are for decoupling. There are 4 of these. ....any value between 10nf & 100nf is fine. I've used 47nF.

The pots are all 100k Linear.

Time to install the LEDs.
I've placed these on the front panel. These LEDs are the superbright variety though I'm not sure of their exact forward voltage or current so I'm experimenting a bit ....using a 10k resistor for now.
(The LED resistor is marked as RL on the PCB) 

Testing the initial build.

LEDs seem to be working.... haven't burnt out yet. :-)
Decided to leave the LEDs where they are for now. Should have cut the legs longer.




     Useful Links
1. Chaos Theory & Jerk Circuits
2. Mongol/Jerkoff - Youtube Video
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Click here to return to the NLC Build Index:
http://djjondent.blogspot.com.au/2015/03/non-linear-circuits-ncl-index.html

Sunday, 28 June 2015

VCS 3 - Putney

Messing around with the old Putney.
She is beautiful to behold and still sounds incredible after all these years.
Some pics of the patch:
I'm sampling during this video to see what I can come up with.
This is the unedited version.
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