- on Test & Measurement
- Published in issue 7/2010 on page 29
PIC RJ-45 Cable Tester
(Summer Circuits 2010 article)
This RJ-45 cable tester automatically checks cable continuity and tests the connection configuration. Each of the eight connections is checked independently and short-circuits are detected.
The circuit can be built using either a PIC16C62B or a PIC16F72.
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.
R1 = 10 k-ohm
R2,R3R4,R6,R7,R9,R10,R11,R12,R14 = 330 ohm
R5 = 560 ohm
R8 = 2.2 k-ohm
R15 = 10 k-ohm x 8 resistor array
R13 = 56 k-ohm
C1 = 20pF ceramic
C2 = 100nF ceramic
T1 = BC327
T2 = BC337
D1 = LED bar, 10 LEDs, e.g. Kingbright DC-10EWA
IC1 = PIC16F72, programmed, Elektor # 090643-41
BT1 = two 1.5 V AA batteries with holder
K1,K2 = 8-pin RJ45 connector (socket), PCB mount
S1 = pushbutton, 6x6mm, e.g. Omron B3W-100
PCB # 090643-1