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 emissions (using on-board coil and amplifier) and higher, broadband signals (for example, mobile phone signals, wireless networks, bluetooth) from around 100 MHz to 3 GHz using a logarithmic detection chip and on-board antenna.


Price: 82 euros with free shipping worldwide

6 in stock.

Sounds like

Earlier prototypes of the detector were used to make most of the recordings which you can hear online at:


The detektor available here finalises the design and adds adjustable attenuation to the AD8313 high frequency detection chip.

Rough guide

Either signal can be monitored from the headphone socket, with one switch selecting low or high frequency domain; both signals can be recorded as a stereo pair from the other socket. With twin potentiometers, adjustments can be made for high frequency signal attenuation and headphone volume. The detektor is powered by three AAA batteries.


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)
  • 47uF TANTAL x1 (segor)


  • LED 0805 x1
  • AD8313 x1 (ebay)
  • OP27 x1 (SMD)
  • LM386 x1 (SMD)
  • LM358 x1 (SMD)


  • 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 (5116 sw) x2 (segor)
  • inductor (L-11P 100M) x1
  • klinkenbuchse 3,5mm (EBS 35) x2
  • battery pack (3xAA = HALTER 3XAAA) x1
  • switches (ALPS ebay) x2


Make your own PCB or purchase for 17 euros (with free shipping worldwide):


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

Date: 2015-04-18 18:00:20 BST

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