Solar|Audio|Graffiti

Solar-powered two-transistor oscillator art installation made from recycled electronic salvage.

Mims (Forrest) Circuit Scrapbook [Fig 1.8 Light-dependent oscillator]: http://books.google.com/books?id=-sE7JVywygQC&lpg=PA5&ots=pj5Iui6Su8&dq=mims%20transistor%20oscillator&pg=PA7#v=onepage&q&f=false

Dirty Video Sequencer

A 4017 based video sequencer circuit with a transistor at each step to close circuit of one of four composite video input to single composite video output. Also has an RCA input for clock, patched from LFO output of Baby 8 Sequencer.

Installed with a companion Dirty Video Mixer (with low-pass filter) on a Little Helper.

Dirty Video Mixer+

A modified version of Karl Klomp’s Dirty Video Mixer with a low-pass filter to adjust chroma. Installed with a companion 4 channel video sequencer on a Little Helper.

Dirty Video Mixer circuit: http://www.karlklomp.nl/pro/dirtmx/dvmschema.jpg

Low-pass filter circuit: http://en.wikipedia.org/wiki/Low-pass_filter

Vactrola

Circuit bent record player. Replaced the needle catridge with an LDR controlled 555 oscillator and plays records retrofitted with LEDs to work as a vactrol-like sequencer.

Circuit Bent Toys

Circuit bent Animal Band toy with a pitch bend potentiometer, a high/low pitch switch, and 3 loop switches; and ran thru a Voice Changer megaphone circuit installed a cassette tape case with in/out jacks.

Sawpler

Circuit bent SAW III Digital Voice Recorder from AllElectronics.com

Circuit Bending a SAW III Sampler: http://www.getlofi.com/?p=1152

Light Dependent Oscillator / Noise 567

555 Oscillator with light dependent resistor (LDR) run through Noise 567 aka SicBox.

555 Timer circuits: http://www.beavisaudio.com/library/555/555.htm
Noise 567 circuit: http://personal.inet.fi/koti/holmberg/images/noise567.jpg

567 Modulator

Tremolo/ring modulator built from an LM567 Tone Decoder IC.

567 Modulator circuit: http://www.beavisaudio.com/bboard/projects/bbp_567Mod_Rev_1_1.pdf

Dual 555 VCO/LFO Oscillators

A 555 VCO with square/triangle waveform selector driven by a 555 LFO and CV input.

555 VCO circuit (CV pin 5): http://www.seekic.com/uploadfile/ic-circuit/2009624221917817.gif
555 LFO circuit: http://www.ecelab.com/circuit-vco-555.jpg

Atari Punk Console / Baby 8 Sequencer

Stepped Tone Generator (APC) with CV input and 8 step sequencer (Baby 10) with CV/LFO outputs.

APC circuit: http://compiler.kaustic.net/machines/apc.html (CV pins 3 & 11)
Baby 10 circuit: http://www.midiwall.com/gear/babyseq/