Theremin Music Instrument effect

Theremin Music Instrument effect

Theremin Music Instrument effect. The typical theremin has two r.f. oscillators, one having a fixed, the other a variable, frequency, with their output signals combined in a mixer/amplifier stage. At “tune-up,” the oscillators are preset to “zero beat” at the same frequency. The frequency of the variable oscillator is controlled by an external tuning capacity–the “antenna”—which is a “whip” or simple metallic plate.

As the musician”s hand is moved near this antenna, the variable oscillator shifts frequency and a beat note is set up between the two oscillators. The pitch is proportional to the difference in frequency between the two oscillators. This beat note, amplified, is the theremin”s output signal. The more advanced theremin designs—such as the version presented here—use a third oscillator to control output volume and two antennas. This theremin also uses a unique FET volume, and a FET output stage.

This schematic diagram come from circuit: Theremin Music Instrument.
Go to that page to read the explanation about above circuit design.

In the electrical sector, a schematic diagram is usually used to describe the design or model of equipment. Schematic diagrams are usually utilized for the maintenance and repair of electronic and electromechanical devices / units. Original schematics were made by hand, using standardized templates or pre-printed adhesive symbols, but nowadays Electrical CAD computer software is often used.

In electronic design automation, until the 1980s schematics were virtually the only formal representation for circuits. More lately, using the progress of computer system technology, other representations were introduced and specialized computer languages were developed, because with the explosive development of the complexity of electronic circuits, classic schematics are getting less practical. As an example, hardware description languages are indispensable for contemporary digital circuit design.

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