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Transmitter for Fibre-Optic IR Extender

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.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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 = 1M?
R2 = 1k?5
R3,R5 = 1k?
R4 = 39 ?
C1,C2 = 33pF
C3 = 15pF
C4,C5,C6 = 100nF ceramic
C7 = 4µF7 63V radial
C8 = 220µF 25V radial
L1 = 47µH
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
J1 = 16-way double contact row, plus jumper
X1 = 18.432MHz quartz crystal
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