Telephone Supervisor
Oops, Big Brother on the phone!
Published in issue 349, December 2005
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.
Resistors:
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
Capacitors:
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
Inductors:
L1 = 47µH
Semiconductors:
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
Miscellaneous:
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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Click below to download a PDF copy of this article from Elektor magazine. Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.
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