Friday, August 28, 2009

The Cheapo keyboard plays itself !

This is just a little idea I've been playing with that you might enjoy. I'm using Lunetta techniques to help bend a toy. First let's get to know the victim:

It's the simplest keyboard I could find, i think i got it for a dollar. The IC is a blobby one, so i focused on learning the basics of keyboard matrices.

Pretty simple, there are groups of buttons, then items within each group.
When you press a key, you're connecting a group and an item and the blobby IC plays it's note.

So how to hack this baby to make it play itself? Here's the plan:

The main job is done by 4052, which is a dual multiplexer. Its big brother 4051 is used quite often in Lunetta machines but I thought I'd give this one a try. This chip can act as a group of analog switches to connect data lines together. Connect four inputs on each side, use logic signals at the A and B pins to select which channels get to the output for each of the two muxes. Connect those two outputs and you're basically rubbing wires together.

And here's what it sounds like. Because I used just a few ICs it's pretty repetitive, so had to turn knobs and change connections to make it do something interesting.

Need to think of better ways to make the 4052's connections have more variety.

Selfplayingcheapo01 by droffset

Instead of using two halves of a 4052 the setup no has an additional 4051 to handle the note selection, while half of the 4052 is still selecting which group of notes to select from.

Selfplayingcheapo02 by droffset
I think i destroyed the circuit, or at least the built in wiring, need to resolder tons of stuff. The bend circuit is more complex than the little crappy thing it's meant for, but the sounds coming out are pretty cool for what it is.

Posted here

Monday, August 24, 2009

Quad MPS panel mockup 1

quad MPS mockup 1
Originally uploaded by drOffset
Here is a mock-up of some panel design for the quad MPSs based on the four elements. Each 19" panel is 3U tall.

It's really sketchy, will replace that with nice crisp vector graphics when it's all said and done. Will get it printed out on a nice surface. It might be a bit too busy.

Currently going through inner conflict...torn between spending the money on the tiny 9mm pots or going for the bigger ones that are WAY less expensive.

Wednesday, August 19, 2009

DIY Synth Pr0n

DIY Synth Pr0n
Originally uploaded by drOffset
Collection of PCBs for a Drum synth project.

MD24 MIDI to Gate PCB by Highly liquid
2x CGS Gate to Trigger Converters
4x Thomas Henry Mega Percussive Synth
1x Ken Stone CGS Cynare
3x Coron DS8 clones by m.Bareille
2x Thomas Henry UD-1
1 set of Klee Sequencer by Scott Sites

Sunday, August 16, 2009

Gotta love the simplicity of this. Noise is something people usually try to avoid, but it actually has a lot of practical applications, from testing audio gear, to aiding concentration to simulating electronic instruments.

White noise on Wikipedia

Tuesday, August 11, 2009

I was on the radio !

Hey folks, Les is a member of the forum under the name Inventor.  He does a weekly internet radio show hosted by the site and this week he featured the strange CMOS synths called Lunettas.  And two of me pieces were played!  There were also contributions from some of the other members of the forum, you'll be suprised at the variety of sounds available from these little buggers.

Here's a link to the show: