Showing posts with label Eurorack. Show all posts
Showing posts with label Eurorack. Show all posts

Saturday, 7 March 2015

Buchla 223e - Multi-Dimensional Kinesthetic Input / Tactile Input Port

A short video of Paul playing a 223e.
Always amazes me as to how responsive this is.



Some pics of the patch:

The unedited version of the video is here:
http://youtu.be/R02sXnVprvA






Saturday, 14 February 2015

8000 Drums - Roland CR-8000, some Buchla & Euro

Paul A. (aka Cobramatic) has just finished modding his Roland CR-8000
and is justifiably proud. The drum sounds amazing and I want to do this
to mine too.  What better excuse for a jam.










Saturday, 17 January 2015

Bently Rhythm Ace test video

This is a test video of the Bentley Rhythm Ace sync Mod.
Here is my previous post with the mod details:
djjondent.blogspot.com.au/2015/01/bentley-rhythm-ace-fr-8l-roland-tr77.html


The Bentley is almost identical to the Roland TR 77 however its sync input
appears in a different place.



We are testing the drum using a combination of modules: lots of Buchla
for the background sounds but the actual drum is triggered from a Eurorack format Flame Arpeggiator sending +5V clock pulses


Seems to work perfectly. More mods coming soon.



Saturday, 15 November 2014

Roland TR-77 (Bentley Rhythm Ace) drum with Buchla & Euro

A record of last weeks jam with Paul A (Cobramatic).



Playing around with lots of Buchla, Euro modular stuff and attempting to sync with old drum machines. Mainly Roland. The CR 68 has a very nice & useful trigger out which is handy for sync/clocking purposes.
The machine below is called the "Bentley Rhythm Ace FR8L"
 It is actually the model that precedes the Roland TR77. The TR77 is almost identical but has a slightly different layout and features.The TR 77 is a bit older and doesn't have any triggers out or in.

 

Still its a beauty. Incredible lush warmth from the kick. It uses all discrete components & analogue voice circuits to produce its drum sounds. "TR" stands for "transistor rhythm" It was produced in 1972. It was I believe Roland's first drum machine.



 It was one of a trio of drum machines released by Roland that year: the 33,55 & the 77.
 
 The Bentley has what must be one of the sexiest start/stop switches around ..... esp as its from 1972.
Its a touch sensitive metal plate.


We had to pass this through a Buchla 230 to enable clocking. Seems to work OK.

 The Buchla 230 is mounted on its side in this case to save room.


a Short video:
Sorry about the audio quality











Tuesday, 11 November 2014

A Roland CR 68 with a Buchla 200 (and a bit of Euro)

I love these old drum machines. The Roland CR 68 is one of my favourites.




It's sending a trigger out to a Buchla 230 envelope follower.


The 230 is mounted on its side.


A 208r


Wednesday, 8 October 2014

A visit to Non Linear Circuits - Perth, Western Australia

While on a recent trip to Perth I dropped by to visit my friend Andrew F of  Nonlinear Circuits.


I got to meet Pinky :-)


This is "Synth Porn"

And even more famous than Pinky are Randy & Bill
Randy is on the left. Bill who is only 4 months old is on the right.



Back to the synths:
This is all Eurorack format, consisting of :
2 tri-core VCOs 
2 LFOs 
2 LPGs 
3 VCAs 
VC spring reverb 
diff-rectifier 
jerkoff chaos 
2x  Buchla inspired 281 EGs 
Sauce of Unce (SOU). Based on the Buchla 265


A new NLC Serge format Panel.

This comprises:
Two VCOs
diff-rectifier 
Vibes (a collection of fixed filters) 
VCA
Mixer



This is part of an electronic analog computer which Andrew rescued many years ago.  It's programmed using patchcords that connect op-amps, capacitors, resistors, etc. to carry out calculations.



                                A adder circuit. It's a lovely illustration of how the Op amp's
                                    negative feedback can be used to do computations.


 This circuit adds the 3 inputs.
Vout = -R4[V1/R1+V2/R2+V3/R3]


                                                                     The integrator.
This op-amp circuit performs the mathematical operation of Integration



 The output voltage is proportional to the integral of the input voltage. (ie: the size of the output is controlled by the length of time a voltage is present at its input). This is determined by the negative feedback capacitor which charges/discharges.


I'm not sure of the age of this computer. Maybe 1950s /  1960's ????
It's beautiful though. 



 Pieter Brugel-the-elder, "The Triumph of Death"

  c. 1562. The original can be found in the Museo del Prado, Madrid 

Skeletons hauling a wagon full of skulls.
Death is indiscriminate. We will all have to face it one day.



An early valve synth



All pics are reproduced with the kind permission of NLCs.