Pure Data Patch from Scratch: “Complex Oscillator”

A quick and easy Pure Data patch-from-scratch tutorial building a “complex oscillator” with two sine waves cross modulating each others frequency for noisy, sophisticated sounds.

In this patch, we set up a simple FM synthesizer with one sine wave modulating another’s frequency. Then, instead of leaving it there, we take our output and use it to modulate the modulation oscillation, leading some wonderful, unpredictable complex sounds.

There’s no talking on this one, just building the patch, and listening to it go.

0:00 Sine Oscillator
0:42 Simple FM Synthesis
1:50 Cross Modulation
2:37 Commenting the Code
4:11 Exploring the Controls

Pure Data introductory tutorials here.
More no-talking Pure Data jams and patch-from-scratch videos.

Lo-Fi Telephone Microphone

Watch me dissect and old phone and repurpose its carbon microphone.

Constructing a lo-fi microphone from an old telephone’s carbon microphone, and seeing what other parts we can make some sounds with.

I got this old phone at Goodwill for a couple bucks, interested in seeing if it had a carbon microphone that I could salvage. It turns out getting that microphone out was a breeze. Then I started seeing what other parts might be interesting–the keypad, the chip that makes DTMF tones. Finally, I put together the circuit for the carbon microphone, and got it back in the handset, adding a new specialty carbon microphone to my mic locker (such as it is).