The DCT Machine uses a dual-channel signal generator connected to two specially wound Double Coils. The apparatus is relatively simple to construct and operate, although care should be taken when winding the coils and making the electrical connections.
The machine is used to generate selected frequencies and create the field explored throughout the Therapeutic Resonances project.
Choosing a Signal Generator
The signal generator should have a frequency range extending to at least 10 MHz.
A dual-channel model is preferable because it allows two separate coils to operate simultaneously. This may also make it possible for two people to receive sessions at the same time.
We recommend a machine similar to the one shown below. It is well constructed, straightforward to use and commonly available through online marketplaces at a relatively modest price.
The recommended generator can operate over an input range of approximately 85 to 265 volts AC. Depending upon the country in which it is purchased, the mains plug may need to be replaced or used with an appropriate adaptor.
Constructing the Double Coils
The coils are made from insulated constantan resistance wire wound around 9 mm wooden dowels, as shown in the photographs.
It is important that the resistance of the completed coil is suitable for the output of the signal generator.
For the recommended model, each Double Coil requires approximately 3.2 metres of 0.2 mm diameter, 32 AWG constantan wire.
The wire must be insulated, normally with an enamel or varnish coating. This prevents electrical contact between neighbouring turns.
The wire is first doubled back on itself so that the two lengths lie side by side. The doubled wire is then wound tightly around the dowel.
Although approximately 3.2 metres of wire is used, the doubled arrangement means that only about 1.6 metres needs to be wound onto the former.
This produces two closely matched helices through which the current travels in opposite directions.
Two small holes should be drilled through the dowel approximately 25 mm apart. These secure the beginning and end of the winding.
The wire can be held in each hole with a short piece cut from a wooden cocktail stick.
Take care not to pull the wire excessively, as constantan wire of this diameter is fine and can break if handled roughly.
If you have difficulty obtaining suitable wire, please contact us and we will do our best to help.
Connecting and Mounting the Coils
The two coils are connected individually to the outputs of the signal generator marked CH1 and CH2.
The BNC leads supplied with the generator can be used for this purpose.
It is usually best to remove the crocodile clips and connect the leads directly to the coil wires using a 3 amp electrical connector strip.
The enamel or varnish must be removed from the ends of the constantan wire before making the connections. This can be done by rubbing the ends gently with fine sandpaper.
Only the section of wire forming the electrical connection should be stripped.
It is worth testing each completed coil with a multimeter, ohmmeter or continuity tester before connecting it to the generator.
The coils may then be mounted securely in a simple wooden stand. They should be supported without crushing or damaging the windings.
Operating the Generator
The generator may initially appear complicated, but only its most basic functions are needed.
When the recommended machine is switched on, it normally returns to suitable default settings:
AMPL = 10.00V SINE
The waveform should remain set to SINE, with an amplitude of approximately 10.00V.
If the settings become confusing, switch the machine off and then on again to restore the default arrangement.
Select either CH1 or CH2 before entering the required frequency.
Channel 1 corresponds to the main frequency displayed as MF.
Channel 2 corresponds to the secondary frequency displayed as SF.
When the green channel light is illuminated, that output is active. When the light is extinguished, the output is switched off.
To enter a selected frequency, consult the table on the Frequencies page.
The decimal point shown in the frequency table corresponds directly with the decimal point on the generator display.
For example, a frequency written as 531.316 should be entered so that the digits occupy the equivalent positions on the screen.
Use the arrow buttons to move the underscore beneath the digit you wish to alter. Turn the large blue and white ADJ control to change the selected number.
To save the settings, press the SYS or MENU button once.
The message *SAVE P_ON FREQ should appear at the bottom of the display.
Press the blue and white ADJ control to store the settings.
On older generators, this button is normally marked MENU. On newer models, it may be labelled SYS.
Using the Machine
A session involves sitting or resting within the field generated by the Double Coils for approximately 5 to 10 minutes.
We have found that the experience appears to be enhanced when the person listens to music of their own choosing.
Instrumental music can be particularly useful because it allows subtle changes in spaciousness, melody and ambience to be noticed more easily.
Everyone responds differently. Sessions should therefore be approached carefully and adjusted according to individual experience.
If the effects feel unusually strong or uncomfortable, stop the session and allow more time before experimenting again.
The procedures presented on this website remain experimental and may be revised as further observations are received.
The machine should not be regarded as a substitute for medical diagnosis, prescribed treatment or appropriate professional care.
Parts and Materials
The following links provide examples of the principal components used in the original construction:
● Constantan 0.2 mm 32 AWG Insulated Resistance Wire
These links are included as examples. Product availability, specifications and sellers may change, so check that any replacement component matches the requirements described on this page.
Technical Background
Double Coil Technology emerged during experiments involving the Schumann resonance.
The fundamental Schumann resonance occurs at approximately 7.83 Hz and is associated with electromagnetic waves within the space between the Earth’s surface and the ionosphere. Lightning activity continually excites these resonances.
The original experiment used two windings from a toroidal transformer connected to a signal generator producing a low-voltage sine wave.
When the machine was first switched on, music happened to be playing. We noticed what appeared to be an immediate but subtle change in the listening experience.
The music seemed more spacious, melodic and ambient.
The comparison was repeated with many listeners, including an experienced record producer. Some people also reported feeling a subtle energetic effect.
Initial attempts were made to record the apparent difference using high-quality audio equipment. These experiments failed to show any measurable alteration to the music itself.
This led to the possibility that the field was affecting the perception or consciousness of the listener rather than physically changing the sound.
That observation encouraged us to explore whether the field might also influence other aspects of human experience.
The original toroidal transformer windings were later replaced by hand-wound constantan coils.
Each Double Coil contains two closely matched helices joined so that the current travels through one winding and then returns in the opposite direction through the other.
The conventional electromagnetic fields produced by the two currents should therefore oppose and largely cancel one another.
Although this arrangement might be expected to produce little or no external field, our experiments suggest that another effect remains.
The apparent field takes approximately 30 to 45 seconds to build after the machine is switched on, but seems to disappear almost immediately when the output is turned off.
Experiments using power levels ranging from microwatts to hundreds of watts appeared to produce surprisingly similar subjective effects.
This suggests that the result may depend more upon cancellation, coherence and resonance than upon the amount of conventional electromagnetic power being used.
Possible explanations involving additional dimensions, wider fields of energy or consciousness remain speculative. They should be regarded as ideas for further exploration rather than established scientific conclusions.
In Essence
● The DCT Machine uses a dual-channel signal generator connected to two hand-wound constantan coils.
● Each coil is made by doubling the wire before winding it around a wooden dowel.
● The enamel must be removed from the wire ends to create reliable electrical connections.
● The generator is normally operated with a sine wave and an amplitude of approximately 10 volts.
● Sessions usually last between 5 and 10 minutes and may be accompanied by music.
● The nature of the apparent field remains uncertain and requires further careful investigation.
The DCT Machine is straightforward to construct once its basic components and settings are understood. We welcome careful experiments, balanced observations and detailed feedback from those exploring the technology.
Click for the next page: Frequencies
