- on Home & Garden
- Published in issue 9/2003 on page 0
DTMF Remote Telephone Switch
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,R3 = 270?
R2 = S07K130 (130V varistor)
R4,R5 = 4k?7
R6,R7,R8 = 10k?
R9 = 2k?2
R10,R11,R13,R14 = 100k?
R12 = 270k?
R15 = 1k?
R16,R17,R18 = 180?
P1 = 470k? (500k?) preset
C1 = 470nF 100V MKT, lead pitch 5mm
C2 = 1µF 63V axial
C3,C4,C5,C7,C10,C11 = 100nF, lead pitch 5mm
C6,C8 = 47µF 25V axial
C9 = 470µF 40V axial
B1 = B40C800, round case (80V piv, 0.8A)
D1-D8 = 1N4004
D9 = LED, low current, red, 3mm
D10,D11,D12 = LED, green, 3mm
IC1,IC5,IC6,IC7 = CNY17-3
IC2 = MT8870DE
IC3 = PIC16F84A-20/P, programmed, order code 020294-41
IC4 = 7805
T1,T2,T3 = BC639
JP1 = 2-way pinheader with jumper
K1,K2,K3 = RJ11, PCB mount
K4,K5,K6,K7 = 2-way PCB termibal block, lead pitch 5mm
S1 = pushbutton, 1 make contact, chassis mount
X1 = 3.579545MHz quartz crystal
X2 = 4MHz 3-pin ceramic resonator
Optional: 24-way SIL pinheader with 6 jumpers
PCB, order code 020294-1
Disk, project software, order code 020294-11 or Free Download