• on Audio/Video/Photography
  • Published in issue 7/2000 on page 0
About the article

Optical S/PDIF Output

Optical S/PDIF Output
This little circuit is intended to be used to provide external access to an unused digital output of a CD or DVD drive in a PC. It provides an electrically isolated interface. In addition, this circuit is also handy for connecting a (portable) MD recorder, since these devices usually only have optical digital inputs.The circuit is a standard application for the Toshiba Toslink transmitter module. On account of the large amount of interference present in the PC environment, extra decoupling for the transmitter module is provided by L1, C1 and C2.
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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.

Resistor:
R1 = 8k?2
Capacitors:
C1 = 100nF ceramic
C2 = 10µF 63V radial
Inductor:
L1 = 47µH
Semiconductor:
IC1 = TOTX173 (Toshiba) (Eurodis)
Miscellaneous:
K1 = 4-pin SIL-header
K2 = 2-pin SIL-header
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