Developed as part of the detektors project with Shintaro Miyazaki, the detektor is now available for purchase as a pre-built and fully tested module for full spectrum exploration of the electromagnetic domain.

The detektor renders audible both low frequency electromagnetic emissions (using on-board coil and amplifier) and higher, wide band signals (for example, mobile phone signals, wireless networks, bluetooth) from around 100 MHz to 3 GHz using a detection chip and a built in antenna.

The detektor is powered by three AAA batteries and can be used with both headphones and any recording device.


Price: 92 euros with free shipping worldwide.

13 in stock.

Sounds like

Earlier prototypes of the detector were used to make most of the recordings here:

See also: http://algorhythmics.ixdm.ch/?p=159

The detektor available here finalises and tidies up the design, also adding adjustable attenuation to the high frequency part of the circuit.

Rough guide

Either low or high frequency signals can be monitored from the headphone socket (with antenna at top and sockets right this is the top minijack socket), with one switch (lower right) selecting low or high frequency domain. Both signals can be recorded as a stereo pair from the other (lower) socket. Low frequency signals are primarily in the magnetic field domain, so the coil (black object top left) needs to be placed quite close to the emitting object (for example, any electronic device such as a mobile phone, bank machine, digital recorder, monitor, LCD and so on). The antenna for high frequency signals is located top right and can barely be seen under the black soldermask layer. It should not be touched or covered with the hand as this will effect signal strength. The antenna will receive signals covering large distances and heavily effected by reflections and other effects from surrounding buildings, bodies and infrastructure.

The bottom left knob/potentiometer adjusts headphone volume. The top right knob controls attenuation of the high frequency signal.

The detektor is powered by three AAA batteries installed on the back of the unit. The power switch is in the middle of the unit.


Schematic and design



The schematic and PCB design (all licensed under the GPL) are available from:


Parts list


  • 1nF x1 (0805)
  • 680pF x2 (0805)
  • 100nF x6 (0805)
  • 47nF x1 (0805)
  • 1uF TANTAL x4 (segor=TA1u0-35A SMD case A)
  • 47uF TANTAL x1 (segor case A or B)


  • LED 0805 x1
  • AD8313 x1 (ebay)
  • OP07 or OP27 x1 (SMD-SO-8)
  • LM386 x1 (SMD-SO-8)
  • LM358 x1 (SMD-SO-8)


  • 10R x3
  • 47R x1
  • 100R x1
  • 330R x1
  • 1K x1
  • 4.7k x1
  • 10k x4
  • 15k x1
  • 22k x1
  • 47k x1
  • 100K x1

(all 0805)


  • 100k POTI x1 (segor=PT10MV-100k)
  • 10k POTI x1 (segor=PT10MV-10k)
  • steckachse (segor=5116 sw) x2
  • inductor (reichelt=L-11P 100M) x1
  • klinkenbuchse 3,5mm (reichelt=EBS 35) x2
  • battery pack (reichelt=3xAAA = HALTER 3XAAA) x1
  • switches (ALPS ebay) x2


Make your own PCB or purchase for 33 euros (with free shipping worldwide):



Author: Martin Howse <m@1010.co.uk>

Date: 2015-09-06 10:00:54 BST

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