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Using the LBC6K
You will need besides the receiver and transmitter:
Headphones or speaker. Any standard headphones will do.
Two 9V batteries or wall adapters; one for each receiver and transmitter.
You will need some method to hold the receiver and transmitter steady. It is
fairly critical that you have good alignment because the focus is pretty tight in
the IR transistor, and a little bit off can mean all the difference between sound
and no sound. The best way I have found is using a couple of bench vises or
putting them in PVC pipe and attaching them securely to some solid mounts.
We've given you the option of using a test tone for your initial alignment of the
two units. Take one of your jumper blocks and place it on H2 between pins 1
and 2, pin 1 being indicated by the arrow. When you're through with your
alignment and you know everything is working you'll want to remember to
place the jumper block between pins 2 and 3 for normal operation. Don't
worry; I'll remind you to do it when we get there.
Check H1 on the transmitter for the jumper to be in the proper place. Pin 1 is
indicated by the arrow and the pins are counted over from there. It is
recommended you use the microphone for now, so install the jumper in the 2
& 3 position.
Apply power to both units and turn them on. The transmitter should have a
nice bright laser beam output. If not, consult the troubleshooting section of this
manual.
Align the two units so the transmitter's laser light is pointing directly into the IR
Transistor. A real help is to listen to the receiver with headphones while
aligning since you will hear the audio tone and it will come through more
strongly once they are properly aligned.
Once you're hearing the tone and feel that everything is lined up where you
want it switch the jumper block on H2 from pins 1 and 2 to pins 2 and 3. You'll
most likely be leaving it there from now on. See, I told you I'd remind you!
Have someone talk into the transmitter microphone or have some sort of noise
source near the transmitter that it can pick up.
Now try shining this through windows, or over longer distances. You will be
amazed at how far you can transmit with the help of a lens to focus the beam
on the receiver side!
If you wish to, you can change the jumper block on H1 from pins 1 and 2 to
pins 2 and 3 and input a line level audio source on J1. Pin 1 of J1 (indicated
by the arrow) is where the audio should be connected and the ground for the
audio should be connected to pin 2 of J1. See the next page for a recap of
the jumper block positions.
LBC6K • 19
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