Sunday, 27 June 2010

Ghetto Sequencer

4 step sequencer with vactrol VCO from concretedog on Vimeo.


So any free time this weekend has been spent creating this..Here we have a 4 step sequencer built from a 30p cd4017 chip and based on this schematic the clock input (tempo control) is provided by an oscillator built on a cd40106. At the moment its controlling a ghetto style VCO (the lower smaller circuit board) which is another oscillator built on a 40106 but being controlled by a hand hack vactrol, basically a light dependant resistor stuck to an led covered in copious amounts of gaffa tape!( I was going to use heatshrink as it is more lightproof but I didn't have any wide enough.) I've kept the different boards separate and have used an old IDE connector with its pins soldered into groups to act as a patch area....this is useful as I plan to build a few different modules and a few more VCO designs and this can serve as a test environment...before ultimately building a bigger sequencer (there's 10 steps available on each 4017!)

I'll post more as I add to it.
(BTW the audio in the vid above is just captured on the mic on my cam)

1 comment:

Palm-Sounds said...

Excellent stuff. I'm really glad you're finding time to keep up the work as I know you're a busy guy these days.