About the article

Magnetic Flux Density Meter

with a simple pick-up coil

Magnetic Flux Density Meter
How do you know accurately if a magnet is stronger or weaker than one you’ve dubbed your reference device? This simple to build instrument has the answer.
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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.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Component list
R1 = * Ohm (100 suggested starting value only)
R2,R5 = 2k7 SMD case size 0805
R3,R4 = 2,2 SMD case size 0805 (e.g., Farnell # 310-4515)
R6,R9,R10,R11 = 10 k, SMD, case size 0805
R7,R8 = 100k SMD, case size 0805
R12 = 1k, SMD case size 0805
R13 = 22
R14 = 39k
P1 = 10 preset, Bourns type 3329H (e.g., Farnell # 345-970)
P2 = 10k preset H
C1,C2 = 2µF2 25V radial
C3,C7 = 100nF, SMD, case size 0805
C4,C5 = 22pF, SMD, case size 0805
C6 = 10µF, 63V, radial
D1 = high current Schottky diode, case size SOD-323, e.g., Zetex type ZHCS400 (Farnell # 301-4850)
IC1 = LP2950CZ-5.0
IC2 = MAX4130EUK-T (Maxim) case size 5-lead SOT-23, or MAX4122EUK-T (Farnell # 353-4169)
IC3 = PIC16F876-20/SP, programmed, order code 040258-41 (28-pin narrow DIP case)
K1 = 2-way pinheader
S1 = on/off switch, 1 make contact, chassis mount
S2 = 2-pole, 2-way changeover switch, chassis mount (+ 6-way SIL header if necessary)
S3 = pushbutton, 1 make contact
X1 = 16MHz quartz crystal, HC-49/4H case
LCD1 = LCD, 1 line, 16 characters, with 14-way pinheader
BT1 = battery pack, 4 x 1.5V AA size
Enclosure with battery compartment for 4 AA batteries, e.g. OKW shell-type case V155 (SG155), version III (OKW # A9408338), size approx. 158x95x33 mm
PCB, ref. 040258-1, from ThePCBShop
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