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The Prism is a documented DIY, guitar-shaped instrument that uses four laser beams as optical strings. Breaking a beam triggers sound; an infrared rangefinder built into the neck controls pitch. Its analog synthesizer circuitry makes it a self-contained instrument concept—not a conventional guitar fitted with pickups, and not a documented mass-market product.
What is the Prism laser synth-guitar?
The Prism was presented in 2009 as an electronics build combining laser-triggered input, analog synthesis and a neck-mounted pitch control. Hackaday called it an interesting instrument, while SonicState described it as a “mutant guitar/synth hybrid.” It is best understood as an experimental instrument project rather than a commercially established guitar.
Unlike a standard guitar, the Prism has no physical strings to pluck. Its beams act as touchless triggers, while onboard circuits generate the sound. The player interacts with the beams and a sensor in the neck instead of fretting strings and exciting them acoustically.
How does the laser guitar make sound?
Four beams serve as optical strings
Gizmodo reported that four lasers act as the strings: when a player breaks a beam, the instrument produces sound. In the creator’s technical discussion, phototransistors detect the interrupted light and comparator circuitry turns the sensor change into a trigger. The beams therefore function as inputs, not as the sound source themselves.
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An analog oscillator generates the tone
The original design uses Thomas Henry’s XR2206 voltage-controlled oscillator (VCO) as its central sound-generating circuit. The build discussion also describes four selectable laser-triggered octave ranges, an onboard low-frequency oscillator (LFO), and a simple sync generator based on a 555 timer.
The neck sensor bends pitch
The neck was refashioned as a pitch controller using an infrared (IR) rangefinder. As the player moves a hand relative to the sensor, its changing output controls pitch. This is distinct from the laser triggers: the beams initiate sound events, while the rangefinder supplies continuous pitch-bending control.
What does the documented design include—and what was proposed?
The sources describe an original design centered on an XR2206 VCO, optical sensors and comparator circuitry, plus the LFO and 555-based sync generator. They also record possible upgrades, not confirmed features of the original instrument:
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- ADSR envelopes (attack, decay, sustain and release) and voltage-controlled amplifiers (VCAs) for more developed note shaping and voice control.
- A mixer and richer delay or Karplus–Strong-style synthesis.
These ideas would move the instrument toward four independently shaped voices and a more elaborate signal path. They would also require more components and integration than the documented core build; they should not be mistaken for specifications of a completed revision.
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How does the Prism compare with its proposed revision?
| Aspect | Documented original | Proposed revision |
|---|---|---|
| Optical sensing | Four laser beams detected with phototransistors and comparator circuitry. | The creator’s discussion does not establish a different optical sensing method. |
| Oscillator architecture | XR2206 VCO identified as the heart of the design. | Four independent XR2206 VCOs were proposed. |
| Pitch control | IR rangefinder in the neck controls pitch. | No change to the pitch-control behavior is established. |
| Envelopes and voices | Four selectable laser-triggered octave ranges are described; a four-channel ADSR/VCA voice architecture is not established. | ADSR envelopes and VCAs were proposed for four channels. |
| Instrument format | Guitar-shaped instrument with onboard analog sound circuitry. | A more complex onboard synthesis design was proposed, not an external-controller-only format. |
Can you build a Prism, and what parts are needed?
Hackaday reported that schematics and a PCB layout were available for download, so the project can be studied as an electronics build. The historical sources do not establish that those files remain available today or that a current kit, manufacturer, warranty or retail supply chain exists.
For the documented design, the described building blocks include four laser modules, phototransistors and comparator circuitry for beam-trigger detection; an XR2206 VCO for sound generation; an IR rangefinder for neck pitch control; and an LFO and 555-based sync generator. The sources do not provide a complete current bill of materials, validated substitute parts or a step-by-step construction guide here. The creator also raised the practical issue of finding components that remain in production, so anyone attempting a reproduction should verify part availability and compatibility against the original project documentation rather than assume a ready-to-order kit.
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Is the Prism laser guitar still sold?
The cited accounts document a DIY project, not an ongoing product listing. They do not verify whether a finished Prism, a kit or its components are currently sold by the creator or any manufacturer. The safest conclusion is that its present commercial availability is unverified; historical build files, where accessible, are not evidence of current retail supply.
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