Toslink Repeater/Splitter

The purpose of this circuit is not only to extend an optical digital audio connection (Toshiba Toslink) but also to function as a splitter, so that two devices can be connected to one Toslink output.
The circuit consists of the standard application for the Toslink receiver module TORX173 (IC1) and the Toslink transmitter module TOTX173 (IC2 and IC3), that we have used on previous occasions.

Resistors:

R1,R2 = 2k2

R3,R5 = 4,7

R4,R6 = 8k2

R7 = 1k5

Capacitors:

C1-C5 = 100nF

C6,C8 = 47µF 25V radial

C7 = 4µF7 63V radial

Inductors:

L1,L2 = 47µH

Semiconductors:

D1 = low-current LED, red

D2 = 1N4002

IC1 = TORX173

IC2,IC3 = TOTX173

IC4 = 74HCU04

IC5 = 7805

PCB, ref. 054005-1