Multimedia applications of the system Theremino

Build a real Theremin with less than 50 Euro

…you take an antenna from an old radio connects a few threads and the Theremin is done. And you should not even be a programmer or electronic designers. Just use the hardware and software modules, to get the strangest musical instruments and never seen before.

First of all,, try as he plays the software. is Open Source, It costs nothing and works even without hardware. Download it and try it now sounds:

Watch these videos:
PolyTest ThereminoTheremin
ThereminoTheremin SlotsToMidi

We're not talking the usual buzzing toys that you see on the net, as the following: = BF_U65Ha0DU = 57S3dylfw3I # = _ 4cIv6qLaM8 = sWjoVNzlU5E = 0F0UEp1DyNs = I2dlDVVE03M = l1TBL3N-FZo # = 8wnQbG10RcM = Yf-7tViVxQE
These links are not chosen from among the worst, the theremin found on the net are even worse. To make a theremin polyphonic and programmable sounds really good, not just an Arduino, It takes the full power of a PC hardware and software. If anyone can, with an Arduino, to make a Theremin with the performance of our, give him a CapSensorHQ and a Master.
Attention: Arduino is great for standalone applications and We recommend often to use Arduino in place of our system. But it is also necessary to clarify the confusion that many are doing between the two systems. Apparently Theremino and Arduino are similar but the underlying philosophy is very different. Trying to simplify: Arduino does everything in firmware and fine for stand-alone applications, Theremino instead bases its application on high level software must be run on a PC.

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Tips to avoid interference between the antennas

The length of antennae and other random factors may contribute together to work the volume antenna on the same frequency as that of the note. This coincidence happens rarely but can be very annoying. If the two antennas are working on the same frequency can interfere with each other and cause interference on note when moving your left hand.

First of all you should check the frequencies in HAL program. Double click with the left button on the first CapSensor (first arrow left). Then click right on the line of the second single CapSensor (first arrow left). Finally, check the two frequencies, indicated by the Orange arrows on the right, to be different (We say at least 100 kHz)

To resolve the problem of interference, Add a capacitor to 10 PF in series with the wire of the antenna of the volume.

This capacitor makes sure that the volume is higher antenna frequency (always better to have the volume antenna with higher frequency than that of note) It also has the beneficial effect of prevent the volume oscillator causes noise when touching the metal of its antenna.

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Tips to avoid interference from external sources

The oscillators of CapSensor have been working for 2.3 to 2.6 Megahertz, It is an area very interference-free radio, over at medium wave and shortwave first. Mobile phones, cordless and WiFi interference sources not. The CapSensor are also immune to powerful radio and CB and amateur radio frequencies.

The output power of CapSensor is much less than that of the Theremin Moog (and therefore a minor electrical pollution to the surrounding environment) but the downside is that the oscillators of CapSensor are much more sensitive to disturbance than a Moog Theremin. There is therefore the possibility that a strong radio station, which coincidentally is exactly on the same working frequency of one of the two antennas, cause eating disorders. Even a Theremin Moog would be disturbed but probably much less.

In some, very rare, cases there have been repeated small disturbances that sometimes lasted for hours and who suddenly disappeared. We were never able to verify this but we think have been some transmitters, do not insert transmission tables, right on some of the frequencies that we do.

If you have these problems, You may add a small capacitor in parallel to the pitch antenna. (between signal and ground) Only the antenna of the intonation is important, because noise is minimal, however, and, even if they exist on the volume, are not audible.

Add capacitors from 2.2, 3.9 or 4.7 PF light causes lowering of the frequency and this way you should find an interference-free zone. Attention that must be pF, If you make a mistake and using capacitors from nanoFarad or MFD, the antenna doesn't work anymore or loses almost all its sensitivity.

Dont worry too much from these observations, don't really ever, However it can't hurt to get some pF capacitors and prepare them for a female connector for emergencies, such a concert next to a transmitter that emits army right on the frequency of the antenna of the notes.

Solder the tad bit that goes to the antenna from below the printed so as to release the connettormaschio and use only female connector-turned as shown on this page:

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Tips to avoid skipping and random noises

You can receive any movement disorders also minimal, metal parts that move, twisting of wood, not well fixed antenna, female connectors, non-turned, touching evil and just move your legs under the table, move the mouse, the table dancing or the public too close.

The application provides a kind of HAL oscilloscope for testing the stability of the oscillators, get into the habit of using it and double check all doing the tests with the only HAL.

Try to move and twist all mechanical parts before you trust that do not create problems. Also try to keep everything firm and ensure that the line is free from disturbances, as on the right side of this picture. You can tolerate at most one pixel of noise as the step that you see on the left before the horizontal part.

Before making important runs, prepare a proper workstation and double check the stability of all components.

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The Theremin Moog

To see Theremins played by true professionals watch these videos: = VHOGW5MDsz8 = 3EPtUPcs8s #
Those who want to learn to play a Theremin should definitely watch this video, from start to finish: = X-ywH1Vj8 _ U *

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On this site you will find patterns and prices of all commercial and Theremin Kit, but also practice directions and hints for learning how to play them. The real Center of the world for thereministi.

And here's an interesting section of the forum on sensors suitable for ThereminSynth:

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The Theremino Theremin

Synthesizers are Theremino system real musical instruments. Compound sounds in software allow richer sounds and endless variations of timbre.

Il Theremino Theremin non è un giocattolo hissing and humming, ma un vero strumento musicale. Uno strumento a livello dei Theremin della Moog, but better because it automatically maintains notes tuned and select under the agreements. The Theremino Theremin can be easily changed, expanded and integrated with other components of the system Theremino, as the capacitive buttons, to compose new musical instruments, never seen before. An imaginative and capable musician could invent concert musical instruments, similar to Laser Harp, but based on other principles. Theremino the system with its endless possibilities for Input-Output is the easiest way to invent new and spectacular musical instruments, to use on stage.

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Videos of Theremino Theremin !

These videos illustrate only the technical performance of the instrument. The musician (I) sounds bad almost all the tools: Guitar, keyboards, bass and percussion. He also tried to play the violin and the hunted by the Group, for the record likes and dislikes “The Night Rovers” and the name was written on the case as “The Beatles” and “The Rolling Stones”
Theremino Synth – Flangy Arp
ThereminoSynth LegatoAndPizzicato
– 01 – Soundtest
ThereminoSynth LegatoAndPizzicato
– 02 – Intro
ThereminoSynth LegatoAndPizzicato
– 03 – Heart
ThereminoSynth LegatoAndPizzicato
– 04 – End

LTSpice simulation of oscillators for Theremin

Download simulation to LTSpice:

Comments and ideas for multimedia applications

  1. Sergio says:

    Sorry for the newbie question, I'm now getting close to the project.
    It's possible, using the current forms, obtain an analog-to-midi converter?
    Eventually combining such modules?
    Thank you

    • Livio says:

      The application can do SlotsToMidi, But it converts the value of the slot in the Notes and Volume. Each Slot is a note and the numerical value of the Slot represents the volume of the note.

      Instead the application Theremin, It can transform the value of a slot in NoteBend and the value of another slot in volume.

      To send physical values ​​in values ​​in slots you can use the ADC of the Master Module. Or you can link to the Master CapSensor who feel the distance of a hand.

      Convert Midi is quite complex (you get lost easily with the values ​​of the notes). Furthermore, the results may not be those images because they depend on “tool” midi sounding, which may not be suitable to the type of driving that by and could play bad or not sound at all. If you can ask us for further details.

      • Sergio says:

        I tried to:
        – AudioInput used to read the PC microphone and separate it into two slots:
        – on a frequency slot
        – one slot on the volume
        – SlotsToMidi use to read those two slots and play them

        But the note was always the same, better rereading your post I understand that I should use instead of SlotsToMidi Theremin.

        A question about AudioInput, I'm not sure I understand what they represent 3 slot:
        – counter slot is the signal frequency?
        – Meter slot is the volume of the signal?
        – Spec. First slot cos’è?
        – What do the parameters of section FHT spectrum bands? (min/max dB, min/max freq, log X, log Y, speed, AGC)

        I searched the documentation, which it is usually in the application zip, but I have not found so I tried to squeeze meaning from web page of the application.
        I'll tell you what I think I know, then tell me if I'm right:
        – in section FHT spectrum bands are defined:
        – the number of spectrum bands that you want to detect (ES. 3)
        – the minimum and maximum frequency of the spectrum to be analyzed
        – the contribution of each of the signal spectrum bandwidth is sent into an array of slot that departs from Spec. First slot (ES. 201) and ends after the chosen number of bands (ES. 203)
        – Trigger level should serve to cut the background noise, considering the null signal if below a certain threshold?
        – Dead time is used to separate a trigger other? I.e., If I'm picking up shots of a piezo electronic drums and I note a signal above the trigger level, I have to wait at least one dead time of silence (signal below the trigger) to consider it as a second pulse? If it was that I should set it to 0 for my purposes?

        Thank you

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