Article

Electrosmog Tester

Health to all, and above all

UK mobile telephony providers are busy rolling out their nationwide 3G network for UMTS. According to a cautious estimate, it will eventually require some 50,000 masts to be erected. It is not surprising that an increasing number of people worry about the extra dose of electromagnetic radiation produced by 3G base stations. The sensitive Elektor Electrosmog Tester not only allows you to provide evidence of rising fieldstrengths in your neighbourhood, but also to find the most radiation-free spots up and down the country.

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Materials

050008-1.pdf

Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

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PCB

Download Gerber file: 050008-1.zip

Component list

Resistors:
R1 = 56
R2,R3 = 10
R4 = 1
R5,R8,R16 = 1k
R6 = 4k7
R7,R13,R15 = 10k
R9 = 365
R10 = 3k16
R11,R18 = 100k
R12 = 470
R14 = 22k
R17 = 560
R19 = 15k
Capacitors (SMD 0805):
C1,C2,C3,C5,C11 = 100nF
C4 = 150pF
C6,C7,C10 = 1nF
C8,C9 = 270pF
C12 = 2nF2
C13 = 22nF
C14,C16 = 10µF 16V, 3.3x3.3mm or 4.3x4.3mm
C15 = 47nF
Inductors (SMD):
L1 = 5nH6, type 0603
L2,L4 = 390µH, type 1210
L3 = 270µH, type 1210
Semiconductors (SMD):
D1-D4 = LED, high-efficiency, green, right angle, type 0805
D5,D6,D7,D11 = LED, high-efficiency, yellow, right angle, type 0805
D8,D9,D10,D12 = LED, high-efficiency, red, right angle, type 0805
D13 = DL4148 (minimelf)
T1,T2 = BC847B, SOT23
T3,T4 = BC857B, SOT23
IC1 = AD8313ARMZ 8-lead MSOP (Analog Devices, print: J1A)
IC2 = LM3914V PLCC (National Semiconductor)
IC3 = LP2951ACD SOIC8 (National Semiconductor, print: 51AxBUL)
Miscellaneous:
S1 = miniature pushbutton with make contact, 6x6 or 10x10 mm, height 18.5mm
Case: SERPAC H-65,9V TRANS RED SRH65-9VTR-ND (Digi-Key)
9-V battery with clip-on leads
PCB (bare, see text), order code 050008-1