Tuesday, August 14, 2007

Phone and sword sequencer

A space sword and a toy phone are circuit bent and controlled by a simple digital logic circuit. The circuit seems to make the two toys interact in unexpected ways, produced glitchy sort of sounds and unpredictable outcomes. Nonetheless, there is a certain amount of control over the sound, with a relatively wide range of timbres and textures (considering the source material).

URL: http://www.youtube.com/watch?v=j1IQTsfNiEA


misoft said...

Hi! Really nice! I don't understand how it works, how did you plug the digital logic circuit into the toys?

Also, is it a 4093 and the same oscillator circuit we can find in the book of Nicolas Collins?


Sebastian Tomczak said...

Hi Misoft,
Thanks for the comment.

The Nicolas Collins book is a very inspirational read. Very simple and easy to understand, yet includes a vast amount of information.

You can learn a little bit more about digital logic flow here: http://www.milkcrate.com.au/_other/sea-moss/

The basic concept of the sequencer is thus:

One square wave oscillator built from a 4093 controls a clock input of a 4040.

The fastest three outputs of the 4040 (Q1, Q2 and Q3) are then used as a digital control.

We can imagine these three outputs to decode into the numbers 0 - 7 as digital binary logic, like so:

Q1 -_-_-_-_
Q2 --__--__
Q3 ----____
7 0

Hopefully this makes sense.

Then, these three outputs control the address pins of two 4051 8 to 1 analog multuplexers.

Connected between the 8 channels of the two multiplexers are 8 1MΩ pots. The middle leg goes to channel 1 of the first 4051 and the outside leg would go to channel 1 of the second 4051 for instance.

The two common outputs of the 4051 are then connected to either connection point of a simple clock (pitch) change bend. So, this is how the sword is controlled.

On to the toy phone, then.

The clock signal feeding the 4040 from the 4093 oscillator in the situation described above then also feeds the control input of two stages of a 4066 quad bilateral switch IC.

Connected to one of the switch controlled by the clock is the button that triggers the phone sound on the toy phone. Connected to the other switch of the 4066 IC is the same sort of simple clock bend that was also found on the sword. The pitch of the sound is controlled by a 1MΩ pot also. This phone bend / circuit provides a droning sort of sound.

Please reply or email me personally if this is not clear.



misoft said...

Thanks for your quick reply! I will have to read this more than once and study that case a little bit. ;-) I will come back to you if i have some questions. Thanksd a lot!


Sebastian Tomczak said...

No probs, eh.

What i wrote will just give you the overall idea, yeah. So maybe some details are missing.. pin numbering, enable pins etc. So let me know if you have any troubles.

Sebastian Tomczak said...
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misoft said...
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