Low Frequency Generator

LFG Fig 1

Working Principle
Source of Inspiration

Listening Test
Other product with same function
How to use

Low Frequency Generator (LFG) is a tool I designed to produce earth magnetic wave (EMW) which has a frequency of 7.83 HzLFG can also produce Sine 7.83Hz, Square 7.83Hz and Sine 10Hz.
Earth's magnetic / EMW wave is actually the electromagnetic wave that is around us.
EMW was first discovered by a German scientist named Dr. Winfried Otto Schumann (Dr. WO Schumann) in 1952, so later this EMW day was also popularly known as Schumann or Schumann Wave waves. In further discoveries in the years following years it was also found that the human brain actually has several types of electromagnetic waves, one of which is most dominant when humans are awake is to have the same frequency with EMW is 7.83Hz,

Working Principal
The process of wave generation is done by Pulse Code Modulation (PCM) method which is also used in CD Player. With the PCM method then the unique shape of Schumann wave or other unique shape becomes very easy in production. LFG also uses Crystal based oscillators so that the output frequency becomes very stable for a very long period of time.
Once generated, low frequency waves are amplified and transmitted through the Iron Core Choke Antenna for maximum coverage and flexible placement.

Inspiration from RR-777
In designing LFG I was very much inspired by the product RR-777 made by Acoustic Revive , around the year 2007-2008 when I was working in a company importer of high end audio equipment which happens to amaze Acoustic Revive product, then I had time to test RR-777 and also sells several RR-777 units to home audio consumers and also to car audio consumers, as it turns out the RR-777 can also be applied in the car.
Currently Acoustic Revive is no longer producing RR-777 and replace it with a better new version of the RR-888.
I do not understand how the low frequency electromagnetic wave mechanism works for audio equipment but what I find with certainty is the use of the RR-777 makes the sound of the audio system cleaner, neater staging and other positive effects.
Experience with RR-777 is what ultimately led me to experiment to make a tool that can produce EMW which I then named Low Frequency Generator. The first research I do in making LFG I do in about March of 2013.


1. LFG capable of generating electromagnetic waves with harmonic composition similar to earth magnetic wave found by Dr. WO Schumann
in 1952. EMW discovered by Dr. WO Schumann is not a common wave like a sine, square, triangle, or waves
Other common waves are commonly generated on function generators, but EMWs are waves with certain unique harmonic patterns, and they are not
can be generated only with ordinary wave generators. The following figure is the harmonic pattern of the EMW discovery. WO Schumann


Schumann Resonance Harmonic Pattern
From Wikipedia

    Generally, any equipment which produces Schumann Resonance consider only 7.83Hz as the only one frequency, and produce this 7.83Hz frequency in the form
    of sine or square wave.  This thinking method can not produce real Schmann Resonance, because Schumann Resonance is not consist of simple or one only
    fundamental waveform.
    If harmonic pattern as described on Picture 3 above being constructed into real waveform supported by Trigonometric and Fourier Transform,  the resulting         waveform will be like  the one in Figure 4 bellow

 EMW after reconstruction
    Unlike many products which produces Schumann Resonance,  LFG generated Schumann Resonance with PCM (Pulse Code Modulation). PCM commonly used in CD,
    DVD or Blueray Play, in such products wave/sound information puts in Disc in the form of digital information, then the player read and reproduce it.
    In LFG waveform information puts in solid state memory, directly read by the processor to produce the required digital wave form.
    Before the digital waveform sends to choke antena,  this digital waveform first converted into analoque signal by Analoque Digital Converter inside the LFG
In addition to Schumann Wave with a frequency of 7.83Hz, LFG can also produce  3 other of low frequency waves

            Schuman  7.83Hz Wave

  LFg Fig 6
Sine 7.83Hz

  LFg Fig 7

Square 7.83Hz

LFG Fig 8  
Sine 10Hz


3. LFG apply specially wind choke as antena, with  this choke antena wave radiatian can reach up 100@msq area. And eventhough LFG puts right on the floor, you still can notice the effect. Unlike the other Schumann Resonance products which can only works properly when put about 1-2m above floor.

LFg Fig10
Choke Antena

4.  Adjustable output level. User can adjust output level

5. LFG apply crystal based resonator with very high stability in level and  output frequency.
    I made LFG  prototype someday in April 2013, until now (Jul 2016) it  still produce exactly same frequency as I first measured it.

6.  Remote Control, you can adjust the level or waveform mode, by sitting on sweet spot, without move to and return from LFG placement

LFG Fig11
Figure  11
LFG w/ Remote Control

7.  LFG can be supplied from line voltage or DC 14-20V for car audio application

8. LFG  backlight display only turns on  up to 40 second from last touch, after that, the  LCD Backlight will turn off, and turn back on after next touch.

9. Honestly I was inspired by RR-777 from Acoustic Revived to developed LFG, but the technical implementation is 100% belong to me, I didn't copy from any

How to use

You can put LFG nearby your audio equipment, but don't put it very closed to your audio equipment.
Even though you put LFG right on the floor, it will still affect system perfomance,
To my experience the best place to put LFG is facing the area between sweetspot or listening spot and loudspeaker radiation area,
The maximum coverage of LFG is about 100@m as I found so far,
The most favourite waveform as  buyer told me is No1  Schumann 7.83Hz, but you may have different opinion.

Other Product with same function
  RR-888 from  Acoustic Revive

Listening Test
LFG, Mandailing, Gayo dan Robusta

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