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Theremin
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== Demonstration == ;Preparation: # Set the amp speaker behind ('''Hands-on''') or in front of ('''Stage''') where you plan to use the Theremin, facing outward. Plug in the speaker, and plug the audio cable into the "normal 2" jack. # Pull out the stand for the Theremin, and adjust the height for the intended audience. unfold the feet on the stand and set it in front of ('''Hands-on''') or behind ('''Stage''') the amp speaker. # Pull out the Theremin, and carefully screw it onto the stand. You want it to be snug, but not tight. # Attach the antennas to the Theremin. Looking at the front of the Theremin, the straight antenna goes on the right, and the curved antenna goes on the left. # Pull out the power cord for the Theremin and plug it into the rear port. Plug the audio cable into the front port on the Theremin. # Turn on the speaker. Set the volume knobs on the speaker between 2 and 3. After the speaker has warmed up for 1-2 minutes, flip on the "ground" switch. # After turning on the "ground" switch, wait 20-30 seconds before flipping on the on/off switch on the Theremin. ;Presentation (Stage): *''Note: the following steps are written with the assumption that the presenter has already familiarized themselves with the Theremin. Like any musical instrument, you have to familiarize yourself with it in order to use it effectively.'' # Prior to the start of the show, adjust the "volume" and "pitch" knobs as needed to tune the Theremin for you to use. Leave the "waveform" and "brightness" knobs at 50%. Leave the Theremin off so to not spoil the surprise. # Ask the audience if anyone recognize the device you have in front of you. If any do, see if they can name it. Explain some of the history behind the Theremin. # Turn on the Theremin, and show the audience that you can make noise using it. After playing with it for 15-20 seconds, quiet the Theremin and ask the audience for ideas on how you are controlling it. You are not touching the device, but they can hear the sounds being made as you move you hands! # After taking some ideas, introduce electromagnetism and electromagnetic waves. Show that the distance between the antennas and your hands determine the pitch and volume. # For an older audience, ask if they know of capacitors and alternating current. If any do, get ideas from the audience. Introduce capacitors, and explain how your hands and the antennas are acting as capacitors. # If you have practiced a song, play it for the audience! You can also generate sounds that the audience will likely recognize as "alien" or "outer space" noises. ;Presentation (Hands-on): # Prior to the start of the show, adjust the "volume" and "pitch" knobs as needed to tune the Theremin for use. Leave the "waveform" and "brightness" knobs at 50%. # When students come up, show them how to hold their hands near the Theremin. Let each student try playing it, making sure they take turns with it. # As able, explain how the distance of their hands to the antenna creates the difference in pitch and volume. For extra curious minds, feel free to include some fun facts about the inventor, LΓ©on Theremin.
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