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Simple RJ45-pluggable IR-repeater

Design of this IR-repeater is based on a photo detector TSMP58138 made by Vishay. This detector differs from many others of this kind by the carrier out signal. The datasheet gives a sample circuit for a repeater application. This design offers slightly modified circuit with visual feedback and an implementation in form of a RJ45 plugin.

The output of photo detector is inverted and its current not sufficient to drive an IR emitter. The inverting amplifier is implemented with a PNP transistor, such as BC212. Resistors R1 and R2 limit current flown via LEDs.

irrep-s-400

The wiring issue is solved by using spare pairs from an existing CAT5 cable. This decision also guided the implementation – the circuit is split on two parts – a front-end with detector and feedback LED, and a back-end with the inverting amplifier.

irrep-400

The leads of the photo detector and LED are crimped directly into the RJ45 connector. The other components are mount on a prototyping PCB.

ir-plug-in-sv ir-plug-in-tv
RJ45 plugin in place
in-place-1 in-place-3

One Comment

  1. Demetri wrote:

    What is the value of the resistor?

    Sunday, June 26, 2016 at 05:18 | Permalink

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