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Home › Magazines › 2000 › July › Transmitter for Fibre-Optic IR Extender

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Transmitter for Fibre-Optic IR Extender

Published in issue 290, July 2000

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.

Components

Relevant products

Resistors:
R1 = 1MΩ
R2 = 1kΩ5
R3,R5 = 1kΩ
R4 = 39 Ω
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

Click below to download a PDF copy of this article from Elektor magazine.

 

Downloads 
PDF Article (E007001.pdf)
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PCB layout (004021-PCB.pdf)
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Order from Elektor 
PCB
004021-1
 

Order from Eurocircuits 

PCB
Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.

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