THE THEREMIN Marco A. Rodriguez Department of Physics & Astronomy, College of Charleston, Charleston, SC.

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Presentation transcript:

THE THEREMIN Marco A. Rodriguez Department of Physics & Astronomy, College of Charleston, Charleston, SC

WAVES / SOUND

Resistor-RCapacitor-CInductor-L555 IC

PARALLEL-PLATE CAPACITOR MODEL

LÉON THEREMIN Born 1896 Russian research 1920 The high frequency oscillator

OPERATION: HETERODYNING High to Low frequency conversion Non-linear signal processing device Heterodynes Filtering to audible frequency range

OPERATION: HETERODYNING

OPERATION: THE VARIABLE OSCILLATOR LC circuit-based Capacitor: Antenna + Hand

OPERATION: THE FIXED OSCILLATOR Initially tuned at high frequency Change in capacitance = change in voltage Voltage-controlled amplifier

CHALLENGES Complexity/construction of circuit Frequency mixing Cost of materials

OPTICAL THEREMIN Varying resistance vs. capacitance No need for RF oscillators No need for heterodyning

THE 555 TIMER Astable mode Light-dependent resistance

CHALLENGES IC sensitivity Soldering work (12 hours of my life I will never get back) Resistor/Capacitor Tuning

Demonstration

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