About the article

Telephone Supervisor

Oops, Big Brother on the phone!

Telephone Supervisor
If you have a fit looking at your monthly phone bill you might want to know who’s on the phone all the time. Also, you may want to start exercising control over which extension in your home is disabled or enabled. The Telephone Supervisor is suitable for up to three phone extensions and comes with smart Windows software that puts you (back) in control of things. One of its most salient features is the ability to log phone calls on the PC.
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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,R3,R5,R7,R9,R11 = 220
R2,R6,R10 = 1k
R4,R8,R12,R13 = 47k
R14 = 330
R15-R22 = 10k
R23,R24,R25 = 22k
R26 = 1k8
C1,C11 = 100nF (C1 5mm lead pitch)
C2,C5 = 220µF 16V radial
C3 = 22nF, lead pitch 5mm
C4,C7-C10 = 4µF7 63V radial
C6 = 220µF 25V radial
L1 = 47µH
D1-D22 = 1N4148
D23 = LED, low current
D24 = 1N4007
T1-T3 = BC212B
T4 = BC549C or BC550C
T5-T10 = BC237B
IC1 = PIC16F628-20/P, programmed, order code 050039-41*
IC2 = MAX232
IC3,IC4,IC5 = IL250 (H11AA4)
IC6 = 78L05
IC7 = 7809
JP1-JP16 = 2-way pinheader and 8 jumpers
K1-K4 = RJ11 PCB mount socket
K5 = 9-way sub-D socket (female), angled pins, PCB mount
X1 = not fitted, see text
RE1,RE2,RE3 = 12V PCB relay, bistable, two energising solenoids 2 x 400?, two changeover contacts, e.g., DS2E-ML2-12VJ Panasonic (Schuricht # 407220; www.schuricht.de)
2 wire links
LCM First Server 1.1 + PIC source & hex code files 050039-81
PCB, ref. 050039-1 from The PCBShop
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