TeslaQuake · Signal Lab

OSCILLATOR

A precision tone generator organised around Tesla’s 3 · 6 · 9 digital-root pattern. Press 3, 6 or 9 on your keyboard.

Scope
2048 FFT LIVE
ROOT 3 ROOT 6 ROOT 9 SUM
−∞ dB
Root Tones KEYS 3 / 6 / 9 · SPACE = ALL
Master 28% Wave
Detune 0 ¢
Tiny phone speakers buzz on deep tones — this lifts anything under 150 Hz up an octave so it stays clean. On headphones, a real speaker or a shaker, leave it off.
Preset
Sum
855 Hz
Sum Root
9
Active Tones
0
Waveform
Sine
Nine-Tone Bank EVERY TONE REDUCES TO 3, 6 OR 9
Digital Root Map

The doubling circuit 1·2·4·8·7·5 never touches 3, 6 or 9 — those three sit apart on their own triangle. Active tones light their node.

Why 3, 6 and 9

Tesla’s documented fixation was on three, not on a 3-6-9 trio. In his 1919 autobiography he described it plainly as a compulsion: every repeated act had to be divisible by three or he would start over. His biographer John O’Neill added the familiar details — circling a block three times before entering, demanding eighteen napkins at dinner. He spent his final years in room 3327 of the Hotel New Yorker, on the 33rd floor, and died there in January 1943. Six and nine are divisible by three, so they inherit the pattern; the “3-6-9” framing itself is a modern gloss, not Tesla’s phrase.

His actual technical work was about resonance. During the 1899 Colorado Springs season he logged stationary-wave passages in Earth’s crust and atmosphere in dated notebooks, published in full in 1978. Aleksandar Marinčić’s commentary in that edition is what first linked those observations to the Schumann resonance near 7.83 Hz — Winfried Schumann published the calculation in 1952. That link is an interpretation by later scholars, not something Tesla claimed.

This page is an instrument, not a claim. It generates clean tones so you can hear how digital-root families stack — nothing more is being asserted about what those tones do.

÷ 3
Tesla’s rule, 1919
3327
Hotel New Yorker
7.83 Hz
Schumann · 1952
1899
Colorado Springs
All repeated acts or operations I performed had to be divisible by three, and if I missed I felt impelled to do it all over again, even if it took hours.

— Nikola Tesla · My Inventions, 1919

His own published words. The widely circulated line about “the magnificence of the 3, 6 and 9” appears nowhere in Tesla’s writings, letters, patents or contemporary interviews, so it isn’t on this page.

This tool produces audio tones for listening and experimentation. It is not a medical device and makes no health claims. Keep the master level low, and stop if any tone causes discomfort.

Common questions

What is a digital root?
Add a number’s digits together, then repeat until one digit remains. 528 becomes 5+2+8=15, then 1+5=6, so its digital root is 6. Every frequency on this page lands on 3, 6 or 9. It is a property of base-ten arithmetic — specifically modulo 9 — and not a property of sound.
Did Nikola Tesla actually say "if you only knew the magnificence of the 3, 6 and 9"?
No. That line appears nowhere in Tesla’s writings, letters, patents or contemporary interviews, and it is only traceable to internet circulation from the 2010s. What is documented is his own account in My Inventions (1919): every repeated act he performed had to be divisible by three or he would start over.
What are Solfeggio frequencies?
A set of nine tones — 174, 285, 396, 417, 528, 639, 741, 852 and 963 Hz — popularised in the 1970s and associated with a medieval hymn. Their historical link to that hymn is disputed by musicologists, and no clinical evidence supports the health claims often attached to them. This page treats them purely as a tuning set that happens to share the 3-6-9 digital-root pattern.
What do the four scope views show?
PHOSPHOR is a persistence oscilloscope showing the waveform over time. SPECTRUM is an FFT showing which frequencies are present and how loud. PHASE plots the signal against a delayed copy of itself, producing a live Lissajous figure that differs for every waveform. BLOOM is a polar rose whose petal count equals the digital root.
Is this safe to listen to?
It is an ordinary audio tone generator, so the usual hearing-safety rules apply: keep the level low and take breaks. Square and sawtooth waves at high frequencies are harsh and can be fatiguing. Stop if any tone causes discomfort. It is not a medical device and makes no health claims.