Ramsey Electronics Laser Beam Communicator, Руководство пользователя

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LBC6K
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7
and 17 are all in parallel, making U1:B have a gain of (Av = 1+ 5.6k/100k) or
17.6. When all three pins are off, only R17 is in circuit making the gain (Av = 1
+ 100K/100K) or 2. This gives a decent range of amplification for small to
large signals, and is controlled by the microcontroller.
The AGC of the microcontroller tries to keep the signal within the range of the
analog to digital converter so that we have the best possible data
reproduction, so the gain is always changing on the last stage to keep it there.
Once the sample is taken in the microcontroller, it is tested for level and the
AGC may or may not be adjusted. It is then converted to a PWM pulse and
sent to pin 9, where Q1 is used to turn the laser module on and off for the
single sample/cycle.
Now the laser beam is sent to the receiver where it is detected and converted
back to an audio signal where you can listen to it on a speaker or earphones!
We know this may be a bit confusing, but there are a lot of principles of digital
data and reproduction packed into this one small kit. If you are interested in
learning more, there are a lot of resources on the internet and in your local
library.
RAMSEY Learn-As-You-Build KIT ASSEMBLY
There are numerous solder connections on the LBC6K printed circuit board.
Therefore, PLEASE take us seriously when we say that good soldering is
essential to the proper operation of your transmitter!
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Use a 25-watt soldering pencil with a clean, sharp tip.
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Use only rosin-core solder intended for electronics use.
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Use bright lighting, a magnifying lamp or bench-style magnifier may
be helpful.
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Do your work in stages, taking breaks to check your work. Carefully
brush away wire cuttings so they don't lodge between solder
connections.
We have a two-fold "strategy" for the order of the following kit assembly steps.
First, we install parts in physical relationship to each other, so there's minimal
chance of inserting wires into wrong holes. Second, whenever possible, we
install in an order that fits our "Learn-As-You Build" Kit building philosophy.
This entails describing the circuit that you are building instead of just blindly
installing components. We hope that this will not only make assembly of our
kits easier, but help you to understand the circuit you’re constructing.