DTMF Remote Telephone Switch
Materials
Gerber file
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Component list
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
Capacitors:
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
Semiconductors:
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
Miscellaneous:
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
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