Picture of Graphite-Controlled Additive Synthesizer
This is an additive synthesizer where you can change the timbre using a mixer made of merely pencil and paper. Why buy variable resisters when you can build one virtually for free?

Step 1: Parts List

Parts You’ll Need:
-3 alligator clips
-22 awg solid core wire
-Solderless breadboard
-9V battery
-battery clip
-7805, Voltage Regulator
-2 Synchronous 4-bit counters (74HC193N)
-7555 Timer
-4 1kΩ resistors
-1 LED
-1 1µF capacitor
-speaker and audio cable or headphones
-graphite pencil and paper
1101Snehil5 months ago

Can u write the code for using the graphite strip with an arduino to play tones from the tones.h library. I will be very thankful to you. Please.

pfred23 years ago
You call that a breadboard? That's not a breadboard, now that's a breadboard!

Check it out, an old light theremin I made. Power was applied at the left, and a speaker goes between ground and some point up by those transistors. By waving your hand over the photocell you change the pitch of the sound.
NYU_MusicTechnology (author)  pfred22 years ago
One of our instructors made a light controlled astable oscillator that was rather extreme in its frequency ranges, and how fast it moved. Perhaps someone could make a dubstep style bass controller this way. 
Orion16153 years ago
Looking at the schematics and the way you connect 2 4bit counters, would it be possible to make a 16-step sequencer by adding 2 more of those 4bit counter modules? Would it be possible to switch between 4, 8 and 16?
NYU_MusicTechnology (author)  Orion16152 years ago
our students make 8 and 16 step sequencers using the 4-bit counter and 8:1 analog multiplexers, similar to these.  hmmm.  time to make another instructable! :)