The trimin is like a theremin, but in triangle form.  It is a radio instrument- you do not need to touch it- it is a tribute to our souls which have no body. With three antennae, it goes beyond the theremin's simple tone, and develops cross modulations in the radio realm, producing more possibilities for complex timbres. It has three audio outputs, but it also transmits to any AM radio, so you can dial further sound possibilities between the stations.

Christmas Jam 1 - Christmas Jam 2 - Trimin 1 - Trimin 2 - Trimin 3 - Trimin 4 - Trimin 5 - Trimin 6

Experiment done with trimin: wrap a coil of wire around stem of "Wandering Jew Plant" so that it becomes a reflex antenna.  Listen via radio umbilical to reactions to different kinds of colored lights:

The Trimin is a silicon version of research done with the Vacuum Tube Trimin: A New Experiment in Vintage Electronics, The Medieval Age of Tube Radio, crossed with Leon Theremin's zen simplicity.

This Tri-Min has three radio oscillators that control a Green CRT tube. It is very sensitive to human movement, capacitance, and it heavily interacts with a wide range of stations on the AM band. As Shown, it has steel peacocks acting as antennae. It has no "audio out"; it is played by moving portable transistor radios within range. It is solid wood "3rd World resourcefulness", with some clear "That 70s Show" plastic, as well as vintage tubes and knobs. Thanks to Dan Conrad and the Baltimore City Schools for letting me reuse stuff that would be thrown away!

It is quite hard to describe what it does, only that you can dance around it and the green ghost will follow your dance. In the viewing window, you can monitor the red glow of the tubes.

Here is a detail of one side. Note the turned-wood, hand-wound coil in the center. There is an antenna connection as well as modulation output for weaving the signals.

Here is a simplified schematic of the radio circuits. (click for larger view). Each hartley oscillator has a 50:100 coil of fine wire and a variable capacitor. It is buffered by a second triode, which then feeds a mixer pentode (note there should be a 1M resistor on the pentode grid and supressor). The output of each mixer pentode goes to the CRT as X, Y, and Z (intensity). Thus you see a woven pattern based on the interactions of the three radios.

For the CRT tube I used a 5CP1 for which I also salvaged a heavy-ass transformer, which generates the +1500 and -1500 volts for Anode and Cathode, as well as +400 volts for everything else. I have a dream of making such high voltage stuff with silicon solar panels, converting high current to high voltage via switching inductance.

Here is the first prototype, horizontal projecting tri-min. Similar schematic, except the variable capacitors all feed back into each other. Much more chaotic.

Start planting!! Enjoy weeds!! Cactus barbs are sharp!! Relish the romanticism of dinosaurs without burning their bodies!!