How a Theremin Instrument

Thérémines produce sounds spooky in the 1950s science fiction films. The theremin is unique among musical instruments that the player does not actually of the instrument. He is played by shaking your hands near two antennas - the volume of controls of left hand and right hand controls pitch. It has been patented by the Russian inventor Leon Theremin in 1928 and became famous for the provision of the original band of loss for such films as "The Day the Earth Stood Still". Modern chip technology, a theremin can be assembled in an afternoon for less than $200 over the costs of the chassis - which can be as simple or complex as you want.Difficulty: moderately Challenging2 antennae2 kHz 172 oscillator chips2 220 kHz oscillator chipsRadio frequency amplifier chipSeveral power capacitors in the 1-5 picofarad ohm loudspeaker9 volt batteryCircuit boardSolderWiresToolsChassis1 range.8

Build a theremin in a chassis that has two antennas - a vertical and one horizontal. To connect to the entrance to a kHz 172 oscillator chips to the vertical antenna and nothing to connect to the entrance of another 172 kHertz oscillator - this stabilizes production at 172 kHz. Cable both output oscillator 172 kHz at the entrance of the amplifier chip. Connect the input of an oscillator to 220 kHz horizontal antenna and leave the entrance to the 220 other kHz oscillator not connected. The two output oscillator 220 kHz power amplifier control pin yarn. Solder pas connections in place until after the circuits are tested.

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Connect the positive terminal of the battery to the positive power of all four chips pins. Chips should be on the same Board, so running a wire along one side of the Board makes it easy. Finally, it must be a wire from the output of the amplifier to the leg of positive on the speaker and a wire leg of negative speaker to the negative terminal of the battery.

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Test circuits before you solder the wires in place. For each location where the outputs of a pair of oscillators are attached together before going to the amplifier, try the range of 1 to 5 picofarad capacitor and see how it influences the sound. Output of the oscillator to go next to the capacitor and the other end of the capacitor goes to pin amplifier. The exact value that will work better depends on the combination of yarn from chassis and smart. The easiest way to find the best capacitor is to try just some. Any capacitor in this range should work.

The design of the chassis with battery and speaker in mind. The battery must be easy to access because it will have to be changed periodically. The speaker should be placed so that the sound can be easily heard.

Do not leave the chips in their orbits while you are welding wires. Soldering heat will damage the chip.

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