Article
Transmitter for Fibre-Optic IR Extender
This circuit restores the original modulation of the signal received from the remote-control unit, which was demodulated by the receiver unit at the other end of the extender (see ‘Receiver for fibre-optic IR extender’).If no signal is received, the Toslink transmitter in the receiver is active, so a High level is present at the output of the Toslink receiver in this circuit. Buffer IC2a then indicates via LED D1 that the receiver unit is active.
Materials
Gerber file
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PCB
Component list
Resistors:
R1 = 1M?
R2 = 1k?5
R3,R5 = 1k?
R4 = 39 ?
Capacitors:
C1,C2 = 33pF
C3 = 15pF
C4,C5,C6 = 100nF ceramic
C7 = 4µF7 63V radial
C8 = 220µF 25V radial
Inductors:
L1 = 47µH
Semiconductors:
D1 = high-efficiency LED, green
D2 = high-efficiency LED, red
D3,D4 = LD271
D5 = high-efficiency LED, yellow
D6 = 1N4002
IC1 = TORX173 (Toshiba)
IC2 = 74HCU04
IC3 = 74HCT4040
IC4 = 7805
Miscellaneous:
J1 = 16-way double contact row, plus jumper
X1 = 18.432MHz quartz crystal
R1 = 1M?
R2 = 1k?5
R3,R5 = 1k?
R4 = 39 ?
Capacitors:
C1,C2 = 33pF
C3 = 15pF
C4,C5,C6 = 100nF ceramic
C7 = 4µF7 63V radial
C8 = 220µF 25V radial
Inductors:
L1 = 47µH
Semiconductors:
D1 = high-efficiency LED, green
D2 = high-efficiency LED, red
D3,D4 = LD271
D5 = high-efficiency LED, yellow
D6 = 1N4002
IC1 = TORX173 (Toshiba)
IC2 = 74HCU04
IC3 = 74HCT4040
IC4 = 7805
Miscellaneous:
J1 = 16-way double contact row, plus jumper
X1 = 18.432MHz quartz crystal
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