Giorgio Necordi’s short report about the making of his transistor theremin.
After a long wait it’s time to come out and unveil the instrument based on my long time experiments with theremins.
This is the theremin you can hear in the “theremin samples” section of the thereminvox.com library
The entire instrument was completed during 2003 and revised many times during 2004 and 2005.
What follows is a collection of specifications, images and mechanical
details of the instruments.
Instrument specifications
Musical range:
5 1/2 octaves – 3 octaves above middle C
Controls:
Pitch tuning, volume tuning,waveform, high tones cutoff, mute switch, power switch, power on led
Outputs
Audio, tuner/pitch preview
Power supply:
External – 11.50 Volt
Volume antenna:
standard loop antenna
Pitch antenna:
telescope rod antenna partially opened
Playing arc linearity enhancer:
Big air coil
Pitch oscillators frequency work:
210 KHz
Volume oscillator frequency work:
440 KHz
Frontal view.
Orthogonal view. The instrument controls stick out from the window on the main chassis.
Back view. The back panel flap down to access the innner area.
The back panel was removed to show the inner area as well.
Electronics and air antenna coils are mounted on a single panel. The panel can be suitably extracted from the main chassis.
The electronics are held inside a internal metal enclosure. Antenna coils are hand wound with #32 AVG enameled copper wire.
The instruments controls are mounted on the frontal panel of the internal enclosure. Note the prototype circuit built on a perforated board.
On the back panel of the internal enclosure are located the trimming screws of the oscillators frequency.
External chassis physical dimensions. All measures are in millimeters.
Internal enclosure mounting. All measures are in millimeters.
Internal enclosure physical dimensions. All measures are in millimeters.
Giorgio Necordi is a Java developer at JTech, an italian software house which he cofounded. He has participated in several musical projects playing mandolin and synthesizers. From 1997 he concentrates on the development of hi-end theremins.
> >
> > Hi,
> >
> > I would be interested to have a copy of the circuit
> diagram
> > (and coil specs) that you used. Any chance you could
> add
> > them to the story?
>
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Would love to buy one. do you have any for sale? DS
I would also
Hi,
I would be interested to have a copy of the circuit diagram (and coil specs) that you used. Any chance you could add them to the story?
Hi,
>
> I would be interested to have a copy of the circuit diagram
> (and coil specs) that you used. Any chance you could add
> them to the story?
> >
> > Hi,
> >
> > I would be interested to have a copy of the circuit
> diagram
> > (and coil specs) that you used. Any chance you could
> add
> > them to the story?
>
I would be interested to have a copy of the circuit diagram (and coil specs) that you used.
>
> I would be interested to have a copy of the circuit diagram
> (and coil specs) that you used.
Hi,
it’s possible to have the schematics of the project?
Thx very much!
> Je serais intéressé d’avoir une copie du schéma de circuit
> (et des spécifications de la bobine) que vous avez utilisé.