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A 100 nH to 100 mH Single-Range Inductance Meter with LCD Readout

Coil Clinic

A 100 nH to 100 mH Single-Range Inductance Meter with LCD Readout
Here’s a portable instrument to measure self-inductance quickly and accurately. Coil Clinic is a one-stop, autoranging meter with microprocessor control — all you do is connect up the unknown inductor and read the value on the LCD.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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.

Extra info, Update
‘Low Battery’ is erroneously displayed when the battery voltage is sufficiently high. The problem is conveniently solved by replacing R2 (10 k) with a 56 k resistor.
R1 = 100kΩ
R2 = 10kΩ
R3,R5 = 1kΩ
R4 = 1MΩ
R6 = 680Ω
P1 = 50kΩ preset
C1,C2,C3,C7 = 470nF
C4,C5 = 12pF
C6 = 4nF7
C8 = 22nF
D1 = BAT85
IC1 = 78L05
IC2 = Atmega48-20PU (order code 060195-41)
IC3 = AD8099ARDZ
S1 = pushbutton, e.g. RA3FTL6 (Multimec)
X1 = 20MHz quartz crystal, low profile
Alphanumerical LCD module, 1x16 characters, HD44870 compatible (see text)
K2 = 14-way SIL pinheader
K3 = 6-way SIL receptacle strip (see text)
PCB, ref. 060195-1 from Elektor SHOP
Source and hex files for ATMega48, free download
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