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sample rates. . . all controlled through a serial access method (called SPI for
Serial Peripheral Interface) by the microcontroller. This truly is an amazing part!
There are so many features that we couldn't take advantage of them all, but are
using some of the best ones for this product.
The Display: The display is driven by a serial shift register rather than a display
decoder so we can have more versatility in the number of digits shown. The
same serial lines used for the voice recorder can be used to drive U4, making
efficient use of the I/O lines on the microcontroller. It has the added benefit of
being very low noise during operation so as not to interfere with the recording.
U1:A, U1:B, The line level circuit: This circuit takes the differential output from
the sound recorder and converts it to single-ended so that you can use it
properly on RCA type connections. It also provides for a bit of filtering and
some gain control to better match your system levels.
These are the primary blocks of circuitry in the BS2C. Now it is time to collect
your soldering iron, tools, and wits, and start putting this neat project together!
BS2 • 6
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