DIY freePEMF duo

freePEMF duo is a device used for magnetotherapy. Similarly to freePEMF it is possible to connect coils and mats to it. Duo simultaneously supports two coils or mats. It also has a display on which the executed command, progress of therapy and other parameters are presented. Despite the greater possibilities, the device is easier to build than freePEMF, because of the modules. It also supports bluetooth.

The shopping list of items is below. If you have already got everything, you can start building the device.

1. We cut the front panel, chasiss, and hole drilling patterns from the template.

Tuning forks

 Recently has become popular to use tuning fork for body healing. Pitchfork tuners operate selectively. They generating a mechanical wave on an audible frequency. Its sinusoidal characteristic does not contain harmonics. You can achieve a similar effect by applying an electromagnetic coil to a specific organ, what is analogous to using a tuning fork. The electromagnetic wave induces vibrations in the body. Ions and other molecules with a non-zero magnetic moment move in the rhythm of the EM field changes.

What is a freePEMF

PEMF is an abbreviation for pulsed electromagnetic field.  The pulsating magnetic field doesn't changes polarity, i.e. it is unidirectional but the intensity varies over time depending of signal shape. If we change the intensity of the magnetic field at the time, we "produce" an electromagnetic wave. The PEMF therapy (PEMFT) is based on interacting of pulsating electromagnetic field with human or animal body. The therapy uses different frequencies and signal shapes. This method is widely used in medicine and supports treatment of many diseases.

 Most popular PEMF devices in market are using extremely low frequency pulses typically from 0.5 to 4 Hz (1Hz means one pulse per second) with high magnet intensity. Wide group of web sites on the Internet are units of low-power supply signal rectangular with the frequency range of 0.5 to 50Hz. FreePEMF device can be made by anyone without knowledge and expertise. The average cost of parts is about $40. [11-2016]. This freePEMF device is also simulating the geomagnetic field of Earth and generates Schumann frequency 7.83Hz. 

Pulsating electromagnetic field is used to treat:

  • Insomnia;
  • Stress;
  • Bone fractures;
  • Cardiovascular disease;
  • All kinds of wounds and injuries;
  • The lymphatic system dysfunction;
  • Pain;
  • Nervous system disorders.

 freePEMF can be used in preventive health, as noted the positive effect of electromagnetic field of ultra-low frequency on the brain and the body's cells. It also applies in meditation and supporting the achievement of other states of consciousness. It has been confirmed that the pulsating electromagnetic field is necessary for proper functioning of the body. Unfortunately, commonly found electro-smog, the natural weakening of Earth's magnetic field affects the deterioration of this important element of our health.

For more information, please find the below films and link.

Bryant Meyers book: PEMF The 5th Element of Health [09/2017]

YouTube films about PEMF  Video 1   Video 2   Video

The film presentates how PEMF effects on blood circulation

For more information, see the instructions for the device free-PEMF  :)


1. Connect the solderless prototype with each other. Position them so that the joints are on the right and down hand side (in the below pictures I used yellow prototypes, but the color does not matter).

2. Then assemble the jumpers. (blue in the picture, but the colour does not matter). Pay attention to the jumper on the left G2-G3 connecting plate and F9-E9 on the right side prototype. The insulation between the relays should be removed between the relays (only cable), because its larger diameter does not allow proper mounting of the relays described in the further part of the manual.

Upload and upgrade of firmware

 The software was created in the Arduino environment, which is an open platform for Atmel micro-controllers. Upload software can be completed before or after module installation, as the USB port can be accessed on the top of the box. Please note that: after assembling the device and connecting it to the PC, disconnect the power supply first.

freePEMF user manual

  This freePEMF page is a free and open-source material decribing the PEMF low-frequency pulsed electromagnetic field therapy device. It has been designed for people who don't necessairly have the electronic background and could put it together by themselves. Amongs other sources, this device has been based on A. Meyers book "PEMF - The Fifth Element of Health". More articles on this and similar topics can be found at page

Device parameters:

  • Output frequency: 0.01 - 60 Hz; Software version mini-freePEMF 2018-10-28 and newer: 61Hz - 16kHz ***
  • Communication socket with PC: miniUSB;
  • FLASH memory for user's therapy script: 1000 bytes:
  • Polarity change: yes - realized with a relay every 2 minutes. Software controlled;
  • Minimum output load resistance: 6 ohms. Output current: 2 A;
  • RMS magnetic induction and impulse: adjustable by coil selection;
  • 14 V power supply;
  • Working time with 50 ohms load: about 3 hours;
  • Signal type: square, default 50/50% fill, program controlled 1-99%

(***) Frequencies above 60Hz should only be used with a specially made coil e.g. yellow, orange with a 100 ohm resistor or a mat. They are used in the bioresonance and informotherapy. Above 60Hz are supported only the frequencies marked in this document in green color.

bioZAP language

 bioZAP script language is used to edit and support user-generated therapy. bioZAP has been implemented in open, free devices based on the ARDUINO platform built to electric current or magnetic and electromagnetic pulsed field therapy. Also alows make other applications eg biofeedback meditation, exteriorization and bioresonance.

Users can exchange their therapy scripts created on the website, modify them themselves and upload them to devices. The database of therapies and devices that support the bioZAP script is available on the portal.

Coil assembly

How to make a coil
The below instruction describes how to create and assemble green coil made of 44 scrolls, 12 cm radius. the resistance equates to 50 ohm. Other coils can be constructed in the similar fashion, however their radius will vary. Therefore a new pad to construct coil will be required.

Mat making

Free-PEMF and multiZAP devices support sets of coils that allow the use of electromagnetic field therapy of low intensity, similar to the one found on Earth.
Additionally, multiZAP allows the use of the mat in case of complex bio-resonance therapies. In this case, no reduction resistor is used, and field strength might be slightly stronger.

To make a mat we will need the following materials: