S C O T T E R I C P E T E R S E N

Composer, electronic musician, improviser

Modular Synth Components

(top, left to right) Oscillator with voltage divider, low pass filter, white noise generator, amplifier

(top, left to right) Oscillator with voltage divider, low pass filter, white noise generator, amplifier

Last night El MuCo (The Mutagenic Cooptoraptors) accomplished a feat heretofore unimaginable: three circuit projects were undertaken and three projects were completed successfully.  While you may be tempted to think that, with the assistance of a book (Ray Wilson’s Analog Synthesizers) and the vast power of the internet this is not a big deal, you could not be more mistaken. Not only because of our chronic electronic ineptitude, but because even getting all the parts together for this much electronic awesome is daunting.  Of course, we didn’t have all the right parts, but we did it anyway because SCOFFING AT CONVENTION IS OUR BREAD AND JAM™! Read the rest of this entry »

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Filed under: Phase 1, Tutorial / How-to, , , , , ,

Analog Ring Modulation Circuit

Above is a video and below are some pictures of a simple ring mod circuit I whipped up last night. The circuit is the classic circuit, and I’m simply running two oscillators from a hex schmidt 6-oscillator IC through the circuit as the carrier and modulator. The frequencies of the hex schmidt are being controlled by a PSR (photosensitive resistor) and an FSR (force sensing resistor) respectively. The video shows fairly well how the PSR reacts to the light. The function of the FSR is a little less clear visually, but you can hear it pretty plainly. I can throw up (!) a schematic of the circuit if anyone is interested, but you should be able to find one by doing a google search.

The project requires a 5V power source (batteries only!) a bread board or project board, some wire (i prefer solid-core) two diodes, two capacitors (0.1uf), 1 133k (or thereabouts) resistor, one PSR, one FSR, one hex schmitt oscillator (mm74c14n) and an audio cable or female 1/8 audio jack to run into a) an amplifier, b) a mixer, or c) your computer.  In this case I have two alligator clips attached to the cut-off and split end of a 1/8 audio cable, the other end of which is running into a mixer and then out to small speakers.

Next on the agenda I think I’m going to build me an ADSR for it. This site has a really great page on ADSRs with diagrams, circuit board patterns, etc.

Filed under: Current Projects, Miscellany, Phase 1, , , , , , , , , ,

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kane Music of Brian Kane
fritz Hartford Phase Shift
fritz Hartford Sound Alliance
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Lique Music of Matt Sargeant
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uncertainty Uncertainty Music Series

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Handmade instruments by Scott Petersen and Brian Kane at Artspace New Haven