Yamaha stereo equipment sold in the US and Canada comes with a built in infrared emitter. It consists of an LED (typically SIM-22ST) and a 10 kΩ resistor in parallel. It is accessible via the remote control in and out jacks. To use, place a mono 1/8" (3.5 mm) plug into the control in jack. Wire the tip of the plug to a current limiting resistor attached to the TX pin on your serial port. Wire the sleeve to GND. Additional yamaha devices or emitters can be connected to the remote control out jack; these will be connected in series.
Pioneer devices come equiped with SR in and out jacks. To use, connect a 100 kΩ resistor to the DTR pin or the TX pin. Then use a 5.1V Zener diode to limit the voltage. Wire this output to the tip of a mono 1/8" (3.5 mm) plug and insert into the SR in jack. Configure the transmitter for Inverted, Hardware carrier. If you use the DTR pin (recommended), you should also check the Animax box. Use the same configuration file as you would for a Pioneer infrared remote control. Note: The sleeve of the plug is not ground. If the device is connected to your sound card, that takes care of the grounding, otherwise connect ground to the chassis of the device.
This should be the same as the Pioneer device, except that you should connect the sleeve to ground. Warning: I have not tried this at all. Please find some more information about this before you try it.
According to my sources this is the same as the Sony Device, except that you should not check the Animax or the Inverted boxes. The protocol is probably very different than the IR remote control. Warning: I have not tried this at all. Please find some more information about this before you try it.
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